Headsets and headphones / Compare

JBL Quantum 520X Wireless vs JBL Quantum 850

A

Product A: JBL

Quantum 520X Wireless

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B

Product B: JBL

Quantum 850

65 of 161 known

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Every value links to where we found it.

Only differences

AJBL Quantum 520X Wireless

BJBL Quantum 850

General

4 of 8 differ

Series

Quantum1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026

Quantum2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Part of the JBL Quantum gaming line, below the Quantum 950.

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

JBLQTUM520XBLKAM2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026Retailer SKU JBLQTUM520XBLKAM. The page lists no separate model number.

QUANTUM 8501Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Model Headset QUANTUM 850, Dongle QUANTUM 850 TM. The dongle model is excluded. No orderable SKU code was found.

GTIN / EAN

05003642546910Retailer pageworldwidestereo.com/products/jbl-quantum-520-x-wireless-over-ear-gaming-headset-blackRead 21 October 2026UPC 050036425469 on the JBL Quantum 520X Wireless listing. This is the US code.

Not available

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

26 August 20261Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026JBL Europe press release dated 26 August 2026, Cologne.

26 August 20262Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026JBL press release dated 26 August 2026.

Status

Available1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026Available to buy in Europe from 26 August 2026. US retailers list it as a pre-order for 18 October 2026.

Available2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Available from 1/10/2026 per the maker. No retailer listing was found, so this follows the maker date.3Press releasenews.jbl.com/en-CEU/268974-jbl-launches-quantum-850-wireless-gaming-headset-with-spatial-sound-head-tracking-and-adaptive-noise-cancellingRead 14 October 2026Same availability statement.6Reviewspacekings.de/2026/10/09/jbl-quantum-850-test-reviewRead 14 October 2026Review published 2026-10-09 with an RRP of 279.99 EUR.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$129.954Press articlethe-gadgeteer.com/2026/08/27/jbl-quantum-520-vs-520x-vs-120-price-connection-xboxRead 14 October 2026JBL US launch information: 129.95 USD for the 520X with retail availability scheduled for 18 October 2026. US price before sales tax.

Not available

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

€99.991Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026520X priced at 99.99 EUR on the European launch. Price as published in Europe, taxes included.

€279.992Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026UK release price 279.99 EUR alongside 249.99 GBP. The EU release gives 279.99 EUR. JBL EU prices include VAT.3Press releasenews.jbl.com/en-CEU/268974-jbl-launches-quantum-850-wireless-gaming-headset-with-spatial-sound-head-tracking-and-adaptive-noise-cancellingRead 14 October 2026Available for 279.99 EUR. Central Europe release.8Press articlegadgetbond.com/jbl-quantum-850-gaming-headset-launchRead 14 October 2026Priced at 249.99 GBP / 279.99 EUR.

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

US, EU10Retailer pageworldwidestereo.com/products/jbl-quantum-520-x-wireless-over-ear-gaming-headset-blackRead 21 October 2026US retailer listing at 129.95 USD. The European press release lists the model on jbl.com in Europe.

Not available

ColoursiThe maker's own colour names

Black5Press articletrustedreviews.com/news/jbl-unveils-quantum-850-and-new-mid-range-headsets-at-gamescomRead 14 October 2026Black is the only colour for the Quantum 520X.

Not available

Segment

Gaming1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026

Gaming2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026A premium gaming headset in the JBL Quantum gaming line.

Design

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Form factor

Over-ear2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026Listing features: over-ear.

Over-ear2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Ear cushions and an ear cup design over the ear. Geektopia calls it circumaural.5Spec databasegeektopia.es/es/product/jbl/quantum-850-wirelessRead 14 October 2026Circumaural is over-ear.

Ear cup enclosureiClosed, open or semi-open acoustic enclosure. This does not describe how the headset folds.

Closed3Spec databasegeektopia.es/es/product/jbl/quantum-520x-wirelessRead 14 October 2026Type: closed circumaural.

Closed4Press articlehifi.blog/jbl-quantum-850-spatial-precision-without-the-base-stationRead 14 October 2026Not stated. Closed enclosure comes from Geektopia.5Spec databasegeektopia.es/es/product/jbl/quantum-850-wirelessRead 14 October 2026Tipo: circumaurales cerrados, which is closed circumaural.

Wearing style

Headband1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026Press release: the range has a silicone headband. The headset is worn over the head.

Headband2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Headband with sliding arm.

FoldingiFlat means the ear cups rotate flat. Inward means the ear cups fold toward the headband.

Not available

Not available

Swivelling ear cupsiEar cups can rotate relative to the headband. Tilting alone does not count.

Not available

Not available

RGB lighting

Not available

Not available

Lighting zonesiNumber of independently controllable lighting areas across both ear cups.

Not available

Not available

Drivers and sound

2 of 20 differ

Driver type

Dynamic1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026Press release: 50 mm carbon dynamic drivers on the Quantum 650, 520, 520X and 120.

Dynamic1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Driver size 50 mm Dynamic Driver.

Driver sizeiDiameter of the largest sound driver. Do not use the microphone capsule diameter.

50mm1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026Press release: 50 mm carbon dynamic drivers on the Quantum 650, 520, 520X and 120.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Driver size: 50 mm / 1.97 in dynamic driver.

50mm1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 20262Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 202650mm Carbon Dynamic Drivers.

Drivers per sideiNumber of sound-producing transducers in one side, excluding microphones.

Not available

15Spec databasegeektopia.es/es/product/jbl/quantum-850-wirelessRead 14 October 2026Spacekings is the source for one driver per cup.6Reviewspacekings.de/2026/10/09/jbl-quantum-850-test-reviewRead 14 October 2026Review: two dynamic 50 mm carbon drivers in total, which is one per ear cup.

Diaphragm material

Not available

Not available

Magnet

Not available

Not available

Frequency response (wired or passive)iPublished acoustic range for wired listening, or the maker’s single range when no mode is distinguished. Power state and test standard belong in the source note.

Min20 HzMax40 kHz2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026JBL specifications relayed by the retailer: dynamic frequency response range 20 Hz to 40 kHz. The maker spec sheet and quick start guide label the same figure as USB audio.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Audio Specifications: Frequency response 20 Hz - 40 kHz (USB Audio).

Min20 HzMax40 kHz1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: 20 Hz - 40 kHz (USB Audio). Stored as the wired USB range. No other connection range is given.

Wireless audio transmission bandiFrequency range of audio transmitted over the wireless connection, not the acoustic response of the driver. Codec, sampling rate and bitrate conditions belong in the source note. When the maker gives a range per codec, the widest range is stored and its codec goes in the source note.

Not available

Not available

Impedance (passive when specified)iUse the headset-off value for a passive analog connection when the maker publishes both powered and passive values. Note the power state and test frequency.

32Ω2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026JBL specifications relayed by the retailer: 32 ohm.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Audio Specifications: Impedance 32 ohm.

32Ω1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Impedance 32 ohm.

Sensitivity (passive when specified)iUse the headset-off figure when both powered and passive values exist. The power or voltage reference, test distance and frequency belong in the source note.

90dB3Spec databasegeektopia.es/es/product/jbl/quantum-520x-wirelessRead 14 October 2026Geektopia lists 90 dB for the 520X. The maker spec sheet and quick start guide state 90 dB SPL at 1 kHz.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Audio Specifications: Sensitivity 90 dB SPL at 1 kHz. The spec sheet has no power reference. The quick start guide adds 1 mW.

100dB1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Sensitivity 100 dB SPL @1 kHz / 1 mW. Maximum SPL 95 dB is a separate figure.

Sensitivity referenceiPublished power or voltage reference for sensitivity. Do not assume 1 mW when the source gives only a dB value.

Per 1 mW6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026The spec sheet gives no reference. The quick start guide states 90 dB SPL at 1 kHz / 1 mW.7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026Tech spec: Sensitivity 90 dB SPL @1 kHz / 1 mW.

Per 1 mW1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026The reference is 1 mW as printed.

THD (claimed)iPublished distortion figure or numerical upper bound. The source note states any less-than sign and test level.

Not available

Not available

Max input power

30mW3Spec databasegeektopia.es/es/product/jbl/quantum-520x-wirelessRead 14 October 2026Maximum input power 30 mW.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Audio Specifications: Max input power 30 mW.

30mW1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Max input power 30 mW.

Max digital audio sample rateiHighest supported digital audio sample rate over a USB cable or wireless dongle. This is not the microphone rate or acoustic frequency response.

Not available

Not available

Max digital audio bit depthiHighest published digital playback bit depth over a USB cable or wireless dongle.

Not available

Not available

DAC

Not available

Not available

Personalised soundiA manufacturer-supported hearing test or ear scan creates a device sound profile tailored to the listener. Generic equalizer adjustments do not count.

Not available

Not available

Onboard EQiCustom playback EQ profiles stored in the headset and applied without the host app running. Note supported active connections. Receiver-only or software-only EQ does not count.

Not available

Not available

Custom EQ bandsiNumber of bands in the custom playback equalizer. Microphone EQ bands are excluded.

Not available

Not available

EQ presets

Not available

Not available

Volume limit

Not available

Not available

Spatial audio

1 of 3 differ

Spatial audio supportiNamed headset or host spatial-audio systems that the maker or reviewer explicitly supports. A platform feature may require compatible hardware, software or a separate licence.

JBL Quantum Spatial Sound1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026JBL Quantum Spatial Sound, powered by JBL QuantumENGINE. All four headsets in the range have it.

JBL Quantum Spatial Sound1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Page 2 and the calibration microphone page name JBL Quantum Spatial Sound.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026JBL Quantum Spatial Sound with Head Tracking.

Spatial audio licence includediA paid spatial-audio licence is bundled or embedded. Compatibility with a separately purchased app does not count.

Not available

Not available

Head tracking

Not available

Yes2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026JBL Quantum Spatial Sound with Head Tracking, powered by JBL QuantumENGINE.

Noise cancelling

3 of 10 differ

Active noise cancelling

No7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026The ten labelled controls and LEDs and the feature list name no active noise cancelling. The only noise cancelling named is the boom microphone noise reduction.

Yes1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Overview item 02: ANC/Ambient Aware On/Off.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Hi-Res certified 50mm carbon dynamic drivers with Adaptive Noise Cancelling.

ANC typeiFeedforward uses outside microphones. Feedback uses inside microphones. Hybrid uses both. Voice-call noise filtering is separate.

Not available

Not available

ANC microphonesiTotal microphones used for active playback noise cancellation across both sides. Do not substitute the total physical or voice microphone count.

Not available

Not available

Adaptive ANCiNoise cancellation automatically changes with the environment or fit. Manually choosing a level does not count.

Not available

Yes2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026The maker names the feature Adaptive Noise Cancelling. No further detail is given.

ANC levelsiNumber of adjustable cancellation strength steps. Off and transparency modes are excluded.

Not available

Not available

ANC attenuation (claimed)

Not available

Not available

Transparency mode

Not available

Yes1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Overview item 02: ANC/Ambient Aware On/Off.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Ambient Aware is named on the ear cup button in the quick start guide. The release does not describe it.

Adjustable transparency

Not available

Not available

Conversation detectioniAudio pauses or lowers automatically when the wearer speaks. Voice assistant activation does not count.

Not available

Not available

Wind noise reduction

Not available

Not available

Measured

None of 21 known

Frequency response notesiMeasured by a reviewer, not claimed by the maker

Not available

Not available

Bass amountiReviewer’s bass deviation from its stated target. Positive is more bass. Target and test method belong in the source note.

Not available

Not available

Treble amountiReviewer’s treble deviation from its stated target. Positive is more treble. Target and test method belong in the source note.

Not available

Not available

Deviation from targetiReviewer’s full-range error from its target curve. Do not substitute a regional bass or treble error.

Not available

Not available

Consistency between fittingsiReviewer’s standard deviation across repeated fittings. Test rig and fitting procedure belong in the source note.

Not available

Not available

Harmonic distortioniIndependently measured harmonic distortion, with test level and method in the source note.

Not available

Not available

Sound leakageiIndependently measured leakage at 30 cm. Playback level and method belong in the source note.

Not available

Not available

Measured noise isolationiIndependently measured attenuation. Positive values mean more noise reduction. ANC state, rig and frequency bands belong in the source note.

Not available

Not available

Noise isolation (measured, best)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Passive isolation (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic quality notesiMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic low-frequency extensioniMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic high-frequency extensioniMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic speech-to-noise ratioiMeasured by a reviewer, not claimed by the maker

Not available

Not available

Measured latencyiEnd-to-end latency measured by a reviewer for a specific connection, platform and codec. Firmware, method and operating mode belong in the source note.

Not available

Not available

Bluetooth latency (measured, worst)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

2.4 GHz latency (measured, worst)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Measured battery lifeiReviewer’s continuous playback test. State the connection, ANC and lighting where known. Unknown settings stay omitted and are described in the source note.

Not available

Not available

Battery life (measured, max)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Clamping forceiMeasured by a reviewer, not claimed by the maker

Not available

Not available

Weight (measured)iIndependently weighed headset. A review that repeats the maker’s number does not qualify. Cable and microphone inclusion belong in the source note.

Not available

Not available

Microphone

3 of 16 differ

MicrophoneiMain microphone used for speech. Secondary internal microphones may be described in the source note.

Detachable boom1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026Press release: detachable 6 mm cardioid boom mic on all headsets in the range.

Detachable boom1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Overview and box: Detachable boom microphone with an audio jack for the boom microphone.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026New 6mm unidirectional boom microphone. The key features list says 6mm cardioid noise-cancelling boom microphone.

Microphone element

Not available

Not available

Microphone pickup patterniUse the maker’s exact named pattern. Unidirectional does not establish whether the capsule is cardioid, supercardioid or hypercardioid.

Cardioid1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026Press release: detachable 6 mm cardioid boom mic on all headsets in the range.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Microphone pickup pattern: Cardioid. The text calls it a 6 mm unidirectional mic with cardioid pattern.

Cardioid1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Microphone pickup pattern Cardioid. The maker press release also calls it unidirectional.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026

Voice microphonesiTotal microphones used for voice pickup or beamforming across both sides. ANC-only microphones are excluded.

17Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026The guide shows one detachable boom microphone and an audio jack for it. No other voice microphone is listed.

Not available

Total microphonesiEvery physical microphone across the headset, including call, ANC and calibration microphones. Shared microphones count once. Excludes microphones in charging cases or receivers, and vibration sensors. Use an explicitly published physical total, never a sum of overlapping role counts.

Not available

Not available

Mic frequency responseiAcoustic microphone response, not its digital sampling rate. Connection-specific ranges belong in the source note.

Min100Max8,000Hz3Spec databasegeektopia.es/es/product/jbl/quantum-520x-wirelessRead 14 October 2026Microphone frequencies 100 Hz to 8000 Hz.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Microphone frequency response 100 Hz - 8 kHz.

Min100Max8,000Hz1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Microphone frequency response 100 Hz - 8 kHz.

Mic sensitivityiPublished microphone sensitivity. Reference such as dBV/Pa or dBFS, frequency and distance belong in the source note.

-40dB3Spec databasegeektopia.es/es/product/jbl/quantum-520x-wirelessRead 14 October 2026Listed as -40 dB with a tolerance of 3 dB. The maker quick start guide states -40 dBV/Pa at 1 kHz.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Microphone sensitivity -40 dBV/Pa at 1 kHz.

-44dB1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: -44 dBV/Pa @1 kHz.

Mic signal-to-noiseiPublished microphone signal-to-noise ratio. Minimum or typical conditions belong in the source note.

Not available

Not available

Mic sample rateiExplicitly published digital microphone capture or speech sampling rate. State the audio route in the source note, or say it is unpublished. Internal capture does not prove the effective rate on every connection. Acoustic bandwidth, playback rate and generic microphone-chip capability do not qualify.

Not available

Not available

Mic noise reductioniProcessing that removes noise from transmitted speech. Playback ANC and a directional microphone alone do not count.

DSP6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Features: the mic does not hear the keyboard thanks to the noise reduction technology through JBL QuantumENGINE, which also reduces keyboard noise and sets mic noise reduction. The processing is software on the connected device.7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026Features: noise reduction technology through JBL QuantumENGINE. Whether it is DSP or AI is not stated.

AI2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Key features: JBL QuantumENGINE customisation including AI keyboard noise reduction. This is a software feature.

Flip to mute

Not available

Not available

Mute button

Yes7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026Overview 02: Microphone mute/unmute. The drawing shows a button on the ear cup.

Yes1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Overview item 05: Microphone mute/unmute.

Mute indicatoriPublished indication of microphone mute. mechanical_marker is a visible physical marker showing the microphone's mute-switch position. LED options require an electronic light. The in-line controller option is for a mute light on a cable remote.

Not available

Not available

Sidetone

Not available

Not available

Adjustable sidetone

Not available

Not available

Foam microphone windscreeniA foam cover for the voice microphone. An internal metal mesh pop filter does not count.

Yes2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026Windshield foam for the boom microphone is in the box.

Yes1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Box contents: Windshield foam for boom microphone.

Connectivity

4 of 20 differ

Audio connectionsiConnections that carry playback audio. Charging or firmware USB alone does not count as USB audio.

USB, 2.4 GHz, Bluetooth4Press articlethe-gadgeteer.com/2026/08/27/jbl-quantum-520-vs-520x-vs-120-price-connection-xboxRead 14 October 2026JBL US specifications: 2.4 GHz wireless dongle, Bluetooth 5.4 and low-latency USB-C wired audio.7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026Power on and connect: 2.4 GHz wireless. Bluetooth section. USB audio section for wired playback.

Analog, USB, 2.4 GHz, Bluetooth1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 20262.4 GHz wireless, Bluetooth, USB audio and a USB-C to AUX cable for analog.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Dual wireless: 2.4GHz USB-C wireless dongle and Bluetooth 5.3. USB-C and 3.5mm wired connectivity.

Analog source plugsiAnalog plug(s) supplied for the source device, including adapters. The headset-side jack is listed separately.

Not available

Not available

Cable connector on headsetiConnection used by the playback cable at the headset. A fixed cable is not replaceable through a headset jack.

USB-C4Press articlethe-gadgeteer.com/2026/08/27/jbl-quantum-520-vs-520x-vs-120-price-connection-xboxRead 14 October 2026Wired audio runs over USB-C. The headset-side port type follows from the USB-C cable. Not seen on a maker diagram for the 520X.7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026The headset has a USB-C port and the USB-C cable carries USB audio. The cable is not fixed. The dongle and boom microphone use their own connections.

USB-C1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Both included cables are USB-C cables at the headset. The AUX cable is USB-C to AUX.

Longest included cableiLength of the longest supplied cable, including charging and dongle cables. Individual cable lengths are listed in Cables included.

1.5m3Spec databasegeektopia.es/es/product/jbl/quantum-520x-wirelessRead 14 October 2026Cable length 1.5 m. Taken as the length of the USB-C cable in the box.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Cable length 1.5 m.

Not available

Headset USB plug or portiUSB plug or port on the headset or its included wired audio adapter. A charging-only USB port can appear here.

USB-C4Press articlethe-gadgeteer.com/2026/08/27/jbl-quantum-520-vs-520x-vs-120-price-connection-xboxRead 14 October 2026USB-C wired audio. The box holds a USB-C cable.7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026Overview 04: USB-C port on the headset. The box holds a USB-C cable.

USB-C1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026USB-C port on the headset. Cables are listed as USB-C.

Audio over USB-C cableiPlayback through a USB-C cable or included wired USB-C audio adapter. A charging-only USB-C port does not count.

Yes4Press articlethe-gadgeteer.com/2026/08/27/jbl-quantum-520-vs-520x-vs-120-price-connection-xboxRead 14 October 2026JBL US specifications: low-latency USB-C wired audio.7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026USB audio section: playback over the USB-C cable on PC, Mac, Nintendo Switch, Mobile and PlayStation 5.

Yes1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026The guide has a USB AUDIO page with PC, Mac, Nintendo Switch, Mobile and PlayStation.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026USB-C wired connection with Hi-Res certified audio.

Passive wired listeningiAnalog playback works with the headset powered off or its battery empty. An active analog converter that needs headset power does not count.

Not available

Not available

Wireless receiveriDedicated wireless audio receiver or dongle. A wired USB sound card does not count.

Included2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026USB wireless dongle in the box.7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026What is in the box: USB wireless dongle.

Included1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Box contents: USB wireless dongle.

Wireless receiver connectoriPhysical USB connector on the receiver. Supplied extension cables and adapters are explained in the source note. Both means two native connector types.

USB-C6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026The box holds a USB wireless dongle and a USB-C to USB-A converter. The quick start guide drawing shows the dongle with a USB-C plug and the converter with a USB-A plug. Stored as USB-C because the converter adapts it to USB-A.7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026What is in the box drawing: USB wireless dongle with USB-C plug and a USB-C to USB-A converter.

USB-C1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026The dongle is a USB-C dongle per the maker press release. A USB-C to USB-A converter is included.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 20262.4GHz USB-C wireless dongle.

Wireless range (claimed)iMaker’s advertised wireless range. Connection and indoor or outdoor conditions belong in the source note. Measured distance is not stored here.

Not available

Not available

Bluetooth

5.42Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026JBL US specifications: V5.4, A2DP profile. German-language press for the same headset says Bluetooth 5.3. The maker spec sheet and quick start guide both say V5.4, which is used.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Bluetooth version V5.4. Profiles A2DP V1.4 and HFP V1.9. No Bluetooth codec is named.

5.31Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Bluetooth version V5.3. Profiles A2DP V1.4.1, HFP V1.8, AVRCP V1.6.3. Codecs are not named. Channel News writes Bluetooth 5.2, which the maker does not.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Bluetooth 5.3.

Bluetooth codecsiNamed Bluetooth audio codecs supported by this exact model. Host, firmware and operating-mode restrictions belong in the source note.

Not available

Not available

LE AudioiLE Audio playback support. Bluetooth Low Energy for app control alone does not count.

Not available

Not available

AuracastiAuracast broadcast audio support. Required phone, firmware and app conditions belong in the source note.

Not available

Not available

Bluetooth multipointiCan remain connected to multiple Bluetooth source devices at once. Mixing Bluetooth with a proprietary dongle is a separate field. A maker's dual connection to two Bluetooth devices at once counts.

Not available

Not available

Multipoint devicesiNumber of Bluetooth source devices connected at once, not the number remembered for later pairing.

Not available

Not available

Paired devices remembered

Not available

Not available

Mixes 2.4 GHz and Bluetooth audioiPlays both wireless audio streams at the same time. Automatic switching or Bluetooth standby does not count.

Not available

Yes2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Dual wireless connectivity allows simultaneous connection through the 2.4GHz dongle and Bluetooth 5.3.

Fast pairing

Not available

Not available

Base station

Not available

Not available

Latency

None of 2 known

Low latency modeiA selectable mode intended to reduce audio delay. A low-latency connection without a distinct mode does not count.

Not available

Not available

Claimed latencyiMaker’s claimed delay for the stated connection and mode. Minimum claims and host restrictions belong in the source note.

Not available

Not available

Compatibility

3 of 3 differ

Compatible platformsiPlatforms with a documented audio path. This does not imply every connection or microphone function works. Platform editions must be checked individually.

Windows, macOS, iOS, Android, Xbox Series X|S, PS5, Nintendo Switch1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026FAQ: optimized for Xbox and compatible with other mobile and PC platforms and PlayStation. Source says Xbox and PlayStation without a console generation. Stored as Xbox Series and PS5.2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026JBL text: works with Windows, Mac, iPhone, iPad, Android, Xbox, PlayStation and Nintendo Switch. Stored as Windows, macOS, iOS, Android, Xbox Series, PS5 and Nintendo Switch. The source does not name console generations.

Windows, macOS, PS5, iOS, Android, Nintendo Switch1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Same pages. Nintendo Switch is the name printed. The press release adds iPadOS and Zoom.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Windows PC, macOS, iOS, iPadOS, Android, Playstation and Nintendo, Zoom Certified. Xbox is not listed.9Press articletrustedreviews.com/news/jbl-unveils-quantum-850-and-new-mid-range-headsets-at-gamescomRead 14 October 2026Compatible with iPad OS, PlayStation and Nintendo certified. Xbox certification is only on the 520X.

Connection per platformiOnly explicitly documented playback paths for the exact model. Microphone support is separate. Leave unknown microphone support omitted. An Xbox and a PlayStation edition of one headset can connect differently, so it is per variant.

AJBL Quantum 520X Wireless

Platform	Connection
Xbox Series X|S	2.4 GHz
Windows	2.4 GHz
Windows	USB
macOS	2.4 GHz
macOS	USB
Nintendo Switch	2.4 GHz
Nintendo Switch	USB
PS5	2.4 GHz
PS5	USB
Android	2.4 GHz
Android	USB
iOS	2.4 GHz
iOS	USB

Source7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026Power on and connect: 2.4 GHz for Xbox, PC, Mobile, Mac, Nintendo Switch and PlayStation. USB audio: PC, Mac, Nintendo Switch, Mobile and PlayStation 5. The guide names Xbox, PlayStation and Mobile without a generation or operating system. Stored as Xbox Series, PS5 and both Android and iOS, as the spec sheet names iPhone, iPad and Android. Bluetooth is not tied to a platform in the guide and has no rows. Microphone support per path is not stated.

BJBL Quantum 850

Platform	Connection
Windows	2.4 GHz
Windows	USB
macOS	2.4 GHz
macOS	USB
PS5	2.4 GHz
PS5	USB
Nintendo Switch	2.4 GHz
Nintendo Switch	USB
Android	2.4 GHz
Android	USB
iOS	2.4 GHz
iOS	USB

Source1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Pages 6 and 8 show 2.4 GHz and USB audio for PC, Mac, Nintendo Switch, Mobile and PlayStation. Mobile is stored as Android and iOS, as the press release names both. The guide says PlayStation without a console generation. PS5 is stored as the current console and PS4 is not stored.

Official licence

Xbox certified1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026Press release: Quantum 520X is Xbox certified.

Not available

Battery and charging

8 of 13 differ

Battery capacityiRated capacity of one headset battery. Do not use case, receiver or total multi-battery capacity.

500mAh2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026Lithium-ion battery, 3.7 V and 500 mAh. Power supply 5 V and 1 A.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Battery type: Lithium-ion battery (3.7 V / 500 mAh).

700mAh1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Lithium-ion battery (3.7 V / 700 mAh).

Swappable batteryiBattery can be exchanged by the user as part of normal operation. Service or recycling disassembly does not count.

Not available

Yes1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Overview item 10 Replaceable battery. A footnote says the battery is replaceable only with an original JBL battery.

Batteries includediNumber of headset batteries supplied, including the one already installed.

Not available

11Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026One replaceable battery is in the box.7Press articlehifi.fan/stories/jbl-quantum-850-wireless-gaming-headset-with-50mm-carbon-drivers-releasedRead 14 October 2026The retail package includes the 700mAh battery.

Claimed battery lifeiMaker’s maximum playback time per stated connection, codec, ANC, spatial audio and lighting settings. Name the spatial processing mode and other conditions in the source note. Unknown settings stay omitted.

AJBL Quantum 520X Wireless

Connection	Hours (h)
2.4 GHz	30
Bluetooth	37

Source2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026Music play time up to 30 h with only 2.4 GHz on and up to 37 h with only Bluetooth on. Talk time of 28 h and 30 h is not stored. ANC, codec and volume are not stated.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Music play time with only 2.4GHz on up to 30 h and with only BT on up to 37 h. Talk time 28 h and 30 h is not stored. ANC, codec and volume are not stated.

BJBL Quantum 850

Connection	Hours (h)
2.4 GHz	25
Bluetooth	30

Source1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: music play time up to 25 hrs with only 2.4GHz on, up to 30 hrs with only BT on, up to 22 hrs with BT and 2.4GHz both on. The dual wireless row has no matching connection option and is not stored. ANC state for music play is not stated. Talk time with ANC is up to 18 hrs (2.4GHz), 20 hrs (BT) and 17 hrs (both). Talk time is not stored as playback.4Press articlehifi.blog/jbl-quantum-850-spatial-precision-without-the-base-stationRead 14 October 2026Up to 30 hours via Bluetooth and up to 25 hours via 2.4 GHz, same as the quick start guide.

Battery life (claimed, max)

37h=CalculatedFrom Claimed battery life

30h=CalculatedFrom Claimed battery life

Battery life with ANC (claimed)

Not available

Not available

Battery life without ANC (claimed)

Not available

Not available

Charging port

USB-C4Press articlethe-gadgeteer.com/2026/08/27/jbl-quantum-520-vs-520x-vs-120-price-connection-xboxRead 14 October 2026USB-C cable in the box with a 5 V and 1 A power supply rating. A dedicated charging port is not named in the 520X sources.7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026Overview 04: USB-C port. The Charging section shows the USB-C cable and the charging LED. Power supply 5 V, 1 A.

USB-C1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: power supply 5V 1A. The USB-C port is item 07 in the overview.

Full charge timeiPublished time to fully charge a depleted headset. In-use charging can take longer.

180min2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026Published as less than 3 hours from empty. Stored as 180 minutes, the upper bound.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Charging time: < 3 hrs from empty. Stored as 180 minutes, the upper bound.

180min1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Charging time < 3 hrs from empty. Stored as 180 minutes. The real time is under that.4Press articlehifi.blog/jbl-quantum-850-spatial-precision-without-the-base-stationRead 14 October 2026Less than three hours for a complete charge.

Quick charge timeiCharge duration in the maker’s quick-charge claim. Read together with Quick charge playback.

5min5Press articletrustedreviews.com/news/jbl-unveils-quantum-850-and-new-mid-range-headsets-at-gamescomRead 14 October 2026A five-minute charge gives one extra hour on the Quantum 650, 520 and 520X. Playback conditions are not stated.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Up to 37 hours of playtime: when it is flat, a 5-minute charge gains 1 extra hour of playtime. Playback conditions are not stated.

10min1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Charging diagram: 10 MIN gives 2 H.7Press articlehifi.fan/stories/jbl-quantum-850-wireless-gaming-headset-with-50mm-carbon-drivers-releasedRead 14 October 2026A 10-minute quick charge provides up to two hours of use.

Quick charge playbackiPlayback gained from Quick charge time. Charger power, codec, volume and ANC conditions belong in the source note.

1h5Press articletrustedreviews.com/news/jbl-unveils-quantum-850-and-new-mid-range-headsets-at-gamescomRead 14 October 2026A five-minute charge gives one extra hour on the Quantum 650, 520 and 520X. Playback conditions are not stated.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Up to 37 hours of playtime: when it is flat, a 5-minute charge gains 1 extra hour of playtime. Playback conditions are not stated.

2h1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Same diagram. hifi.blog states ten minutes gives up to two additional hours of playback.4Press articlehifi.blog/jbl-quantum-850-spatial-precision-without-the-base-stationRead 14 October 2026Ten minutes connected gives up to two additional hours.7Press articlehifi.fan/stories/jbl-quantum-850-wireless-gaming-headset-with-50mm-carbon-drivers-releasedRead 14 October 2026Same sentence.

Use while charging

Not available

Not available

Charging dock or stand

Not available

None2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026The Quantum 950 features the added Base Station. The 850 has none. TechNetBooks says the 850 has a dock, which the maker release contradicts.4Press articlehifi.blog/jbl-quantum-850-spatial-precision-without-the-base-stationRead 14 October 2026The 850 dispenses with the flagship's separate base station.

Controls

1 of 6 differ

Controls

Not available

Buttons, Chat mix wheel1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Overview: ANC/Ambient Aware button, microphone mute button, power button, spatial sound button, 2.4 GHz pairing button and the game audio-chat balance dial. The volume control type is not clear from the drawing and is not stored.

Volume control

Not available

Not available

Game and chat mixiBalances separate game and chat audio streams. Mixing Bluetooth and dongle source volume alone does not count. Supported platforms belong in the source note.

Hardware dial7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026Overview 08: Game audio-chat balance dial. The French text calls it a game and chat audio mixing wheel.

Hardware dial1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Overview item 11: Game audio-chat balance dial. The platforms it works on are not stated.

Remappable controlsiOn-device button, touch or dial functions can be reassigned. Changing EQ alone does not count.

Not available

Not available

Wear detection

Not available

Not available

Voice assistant

Not available

Not available

Comfort and build

5 of 11 differ

Headband type

Not available

Suspension strap2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Ultra-light air mesh hammock suspension system.

Headband material

Silicone1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026Press release: the range now has a silicone headband and breathable fabric ear cushions. Stated for the range, with the Quantum 520X included in the same sentence.

Air mesh hammock2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Air mesh hammock suspension.

Frame material

Not available

Not available

Ear cup material

Not available

Not available

Ear pad material

Breathable fabric1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026Press release: the range now has a silicone headband and breathable fabric ear cushions. Stated for the range, with the Quantum 520X included in the same sentence.

Memory foam with synthetic leather (leatherette) cover2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Soft leatherette ear cushions.4Press articlehifi.blog/jbl-quantum-850-spatial-precision-without-the-base-stationRead 14 October 2026Memory-foam ear cushions with a synthetic-leather covering.6Reviewspacekings.de/2026/10/09/jbl-quantum-850-test-reviewRead 14 October 2026Ear pads are memory foam.

Replaceable ear pads

Not available

Yes1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Press release lists ear cushions as replaceable.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Ear cushions are replaceable.

Ear pad attachmentiHow a replacement ear pad attaches to the ear cup, not how the decorative outer cover attaches. A press-fit or snap-on pad counts as clip.

Not available

Not available

Ear pad openingiUsable opening inside an ear pad, excluding the outer cushion. Depth is the internal space between pad surface and driver cover.

Not available

Not available

Ear tips included

Not available

Not available

Dust and water rating

Not available

Not available

User-replaceable parts

Not available

Boom microphone, USB-C cable, Ear cushions, Earcaps, Headband hammock, Battery1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Overview items: replaceable battery and replaceable headset cap. The full list is from the maker press release.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Replaceable system: microphone, USB-C cable, ear cushions, earcaps, hammock and battery pack.

Software

2 of 3 differ

Companion app

JBL QuantumENGINE2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026JBL text: JBL QuantumENGINE dashboard and free PC suite.

JBL QuantumENGINE (PC) and JBL Quantum App (mobile)1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Download JBL QuantumENGINE, or the JBL Quantum App.2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026JBL QuantumENGINE.

App platforms

Windows11Maker product pagesupport.jbl.com/us/en/howto/jbl-quantum-engine-software-release-notes-us/000018780.htmlRead 21 October 2026QuantumENGINE software update release notes, version 2.8.6 of 2026-08-21: added support for Quantum 520X and Quantum 255. The page covers the Windows application. The macOS release notes name no 520X, so macOS is not stored. Mobile app support is not stated.

Windows, macOS, Android, iOS1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026The page shows Windows and Apple logos for QuantumENGINE and Google Play and App Store badges for the Quantum App.

User firmware updates

Not available

Not available

Dimensions and weight

1 of 2 differ

Headset weightiPublished headset mass without detachable cable or microphone when stated. A fixed cable remains included. Any unqualified maker weight is identified in the source note.

322.8g(11.4 oz)2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026Specification: 322.8 g. Unqualified maker weight, not independently weighed. Microphone inclusion is not stated.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Weight 322.8 g. Unqualified maker weight.

349.7g(12.3 oz)1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Tech spec: Weight 364.2 g (included talk mic 14.5 g and battery 16.4 g). Stored 349.7 g, which is 364.2 g minus the 14.5 g detachable microphone, battery included. The figure on the maker page is 364.2 g.4Press articlehifi.blog/jbl-quantum-850-spatial-precision-without-the-base-stationRead 14 October 2026364.2 g including its microphone and battery.

Headset dimensionsiBody size with headband upright and ear cups in their normal wearing position. Width is across the head, height is top to bottom, and depth is front to back. Folded or flat-swivel dimensions are not substituted.

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Certifications

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Hi-Res Audio

Hi-Res Audio1Press releasenews.jbl.com/en-CEU/269347-jbl-announces-jbl-quantum-520-quantum-520x-and-quantum-120Read 14 October 2026Key technologies and FAQ: all four headsets feature Hi-Res Audio. The wired or wireless path is not stated.

Hi-Res Audio2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Hi-Res certified. The maker links the certification to wired USB-C and 3.5mm use.

Communication certifications

Zoom certified6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026Zoom certification: the headset meets all the technical and sound qualifications for Zoom certification.

Zoom Certified2Press releasenews.jbl.com/en-GB/269556-jbl-quantum-850-competitive-audio-without-compromiseRead 14 October 2026Zoom Certified.

FCC ID

APIJBLQ520X9Regulatory filingfccid.io/APIJBLQ520XRead 21 October 2026FCC ID APIJBLQ520X, Harman International Industries, product code JBLQ520X, gaming wireless headset, final action 2026-06-11. The USB wireless dongle has its own ID APIJBLQ520TM, which is not stored. The quick start guide names the headset model QUANTUM 520X.

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Other certifications

EU Radio Equipment Directive 2014/53/EU conformity, EU RoHS Directive 2011/65/EU conformity, UK Radio Equipment Regulations 2017 conformity, UK RoHS Regulations 2012 conformity8Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dw0e2c42a9/pdfs/JBL%20QUANTUM%20520X-EU_UK%20DOC_V8.1.pdfRead 21 October 2026EU and UK declarations of conformity for models QUANTUM 520X and QUANTUM 520 TM dated 2026-06-16. EU: RED 2014/53/EU and RoHS (EU) 2015/863 amending 2011/65/EU. UK: Radio Equipment Regulations 2017 and RoHS Regulations 2012.

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In the box

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In the box

JBL Quantum 520X headset, Detachable boom microphone, Windshield foam for boom microphone, USB wireless dongle, USB-C to USB-A converter, USB-C cable, Quick start guide, warranty card and warning card2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026What's in the box: headset, detachable boom microphone, windshield foam, USB wireless dongle, USB-C cable and paperwork.6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026What is in the box: headset, detachable boom microphone, windshield foam, USB wireless dongle, USB-C to USB-A converter, USB-C cable, quick start guide, warranty card and warning card.7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026What is in the box: USB-C cable, USB wireless dongle, windshield foam, USB-C to USB-A converter, detachable boom microphone, QSG, warranty card and safety sheet.

JBL Quantum 850 Wireless, USB-C cable, USB-C to AUX cable, USB wireless dongle, USB-C to USB-A converter, Calibration microphone, Detachable boom microphone, Windshield foam for boom microphone, Replaceable battery, Pouch, Quick start guide, Warranty card, Safety sheet1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026What's in the box page.

Cables includediSupplied playback, charging, dongle and adapter cables. A permanently attached headset cable is included and named as fixed.

AJBL Quantum 520X Wireless

Type	Length (m)	Count
USB-C	1.5	1

Source3Spec databasegeektopia.es/es/product/jbl/quantum-520x-wirelessRead 14 October 2026Cable length 1.5 m with a USB-C connector. The USB-C cable in the box matches this listing. The other end of the cable is not stated.

BJBL Quantum 850

Type	Count
USB-C cable	1
USB-C to AUX cable	1

Source1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026The guide shows both cables without a length.

Carrying caseiSupplied carrying case or pouch. A retail carton does not count as a carrying case.

None7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026The complete box list holds no carrying case or pouch.

Soft1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Box contents: Pouch.

Links

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Product page

www.jbl.com/QUANTUM520X.html12Maker product pagejbl.com/QUANTUM520X.htmlRead 21 October 2026JBL US product page with the spec sheet, quick start guide and declaration of conformity downloads.

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Spec sheet

www.jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdf6Maker spec sheet (PDF)jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwb8b62ee8/pdfs/JBL_Quantum_520X_Specsheet_EN.pdfRead 21 October 2026JBL Quantum 520X spec sheet, 2 pages, English, created 2026-08-20.

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Manual

www.jbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdf7Owner's manualjbl.com/on/demandware.static/-/Sites-masterCatalog_Harman/default/dwff42b79c/pdfs/JBL_Quantum_520X_QSG_Global.pdfRead 21 October 2026Multilingual quick start guide, 40 pages. English pages 1 to 10.

www.mediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdf1Owner's manualmediaexpert.pl/products/files/13/13811540/Instrukcja-obsalugi-JBL-Quantum-850.pdfRead 14 October 2026Quick start guide, 40 pages in many languages. The maker site could not be read, so this copy hosted by a retailer is cited.

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

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Warranty

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Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

1year2Retailer pageaudio46.com/products/jbl-quantum-520x-wireless-gaming-headsetRead 14 October 2026US listing: 1 year limited JBL manufacturer warranty.

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Both are also in the API. Back to all headsets and headphones.