JBL Quantum 400
|Driver size (mm)||50|
|Maximum input power (mW)||30|
|Driver sensitivity at 1kHz/1mW (dB)||98|
|Dynamic frequency response range (Hz)||20 Hz - 20 kHz|
|Passive Frequency Response||20 Hz – 20 kHz|
|Charging Cable Length (m)||3|
|Charging Cable Length (ft)||9.8|
|Ear Cup External Height (in)||3.9|
|Ear Cup External Width (in)||3.5|
|Ear Cup Internal Height (in)||2.3|
|Ear Cup Internal Width (in)||1.9|
|Ear Cup Depth (in)||1.1|
|Ear Cup External Height (cm)||9.9|
|Ear Cup External Width (cm)||8.8|
|Ear Cup Internal Height (cm)||5.8|
|Ear Cup Internal Width (cm)||4.9|
|Ear Cup Depth (cm)||2.7|
|Audio Cable Length (ft)||3.9|
|Audio Cable Length (m)||1.2|
Documents & Downloads
Quick Start Guide
What’s in the Box
- 1 x JBL Quantum 400 headset
- 1 x Type-C to Type-A cable
- 1 x 3.5mm audio cable
- 1 x Windshield foam for boom microphone
- 1 x Quick Start Guide
- 1 x Warranty card
- 1 x Safety Sheet
FAQs & How-Tos
Quantum Engine: Software Update Release Notes
Software Update Release Notes
Release Date: 1/21/21
Welcome feature has been implemented.
Surround Modes feature has been implemented.
ANC/TT toggle has been implemented.
The sidetone has been turned off by default for all models to avoid confusion.
QuantumSURROUND/QuantumSPHERE quality & performance have been improved.
Quantum 300 Mic Gain has been improved.
Quantum 800 FW update reliability has been improved.
Minor Bugs Fixed
JBL QuantumENGINE Features
You can adjust Equalizer, Spatial Sound, RGB LED effects, change microphone settings and update the headset's firmware
The JBL Quantum 400 headset is compatible via 3.5mm jack with PC, PlayStation, Xbox, Nintendo Switch, Mobile, Mac and VR.
You can use the USB connection with PC, PS4, Nintendo Switch, and Mac.
The story behind our Quantum name
We wanted the name to reflect this futuristic inspiration married with cutting-edge technology. The Quantum name was ultimately chosen as it conjures images of both the technology aspect through the advances in quantum computing but also a very organic feel with reference to quantum physics and the science behind building upon small elements to make massive improvements.
No sound in my Quantum headphonesEnsure that the correct device is selected as the default device under Control Panel>Sound>Playback. Make sure the on headset volume control is turned up. Rotate the volume wheel on your headset to increase the volume. Check that the correct playback device is selected under Control Panel > Sound > Playback. Select the correct device, right-click, and select "Set as Default Device". Check the computer volume levels and make sure it is not muted or turned all the way down.
Why can't I hear audio from my headphones?
Make sure the headset volume control is turned up. Rotate the volume wheel on your headset to increase the volume. If you're connected to the PC via USB, check that the default device is selected under Control Panel > Sound > Playback. Select JBL Quantum 400 Game, right-click, and select "Set as Default Device". Check on the top bar of the JBL QuantumENGINE whether your headset's game-chat balance dial is set correctly. Check the JBL Quantum 400 Game device and make sure it is not muted or turned all the way down.
Why are my headphones shown as “speakers” on Windows?
The “Speaker” mode allows the JBL QuantumENGINE to receive more than two channels of audio. It also prevents some applications from adding extra signal processing intended for other headphones, which would negatively impact the performance of the JBL QuantumSURROUND or JBL QuantumSPHERE 360 technology.
Why can't your teammates hear you?
Make sure the headset volume control is turned up and your microphone is unmuted. Check that only one voice chat application is in use while in-game. If you're connected to the PC, make sure that the communication device is selected under Control Panel > Sound > Recording. Select the JBL product and select "Set as Default Device". Check on the top bar of the JBL QuantumENGINE whether your headset's game-chat balance dial is set correctly.
JBL Quantum ONE and Quantum TWS: How do I clean my headset?
You can clean it by wiping it gently with a damp cloth. Take extra care not to let water leak into the speaker chamber, as it will damage the speaker drivers.
What can you do with JBL QuantumENGINE software?You can adjust equalizer, RGB LED effects, change microphone settings and update the headset's firmware.
How RBG lighting work for console games
JBL Quantum 400 and ONE are compatible with USB C to A cable to enjoy PS4 console with RGB Lighting on, and Quantum 600 and 800 with wireless-enabled by USB dongle also gives lighting moment on PS4 console games.
*NOTE that RGB will not light up when connecting with 3.5mm cable to any device (PC, Console, Mobile, etc.) because the cable doesn't have power enough for the RBG lighting.
How to clean your Quantum headphone
You can clean your headphones by wiping it gently with a damp cloth. Take extra care not to let water get into the speaker chamber, as it will damage the speaker drivers. If you need replacement ear pads, please reach out to your local JBL Customer Support to inquire about replacement parts.
Mic Monitoring (side tone) Support
Yes. You can configure the volume of the mic monitoring in JBL QuantumENGINE. And the default setting of the mic monitoring is set of “OFF”.
Which products are supported by the JBL QuantumENGINE software?
JBL Quantum 300, 350, 400, 600, 610, 800, 810 ONE, TWS and Stream are working with the QuantumENGINE
7.1 Surround configuration set up guideTo configure the 7.1 Surround feature on your PC, please follow the guide below:
1. In the left corner on your screen right next to the Windows logo, click on the spy-glass to start a search on your PC.
2. Type in Sound --> then select Change System Sounds:
3. Make sure that your the Quantum Headphones is your Default Device for both Speakers ( Game ) and Earphone ( Communication device )
4. To configure the 7.1 Surround feature, right click on the Speakers --> then select Configure Speakers
5. Select 7.1 Surround and click on Next
6. Make sure that all boxes are selected, then click Next
7. Make sure both boxes are selected, and then click Next
8. Click on Finish. Now your Quantum headphones is configured for 7.1 Surround sound. The configuration will remain after rebooting PC or reconnecting headphones.
Enjoy your sound experience #SoundIsSurvival #DareToListen
How to set up your microphone
Ensure that only one voice chat application is in use while in-game. Be sure you hear a click when the microphone is flipped down. The microphone will only function when it is flipped down fully. If you see a red LED on the microphone, it is muted.
How to check your PC settings for the correct recording device
1. Go to Control Panel
2. Select Hardware and Sound
3. Click on Sound
3 Select Recording
4. Make sure to select the proper recording device.
Right-click on it Quantum headset.
Now select "Set Default Device" or Select "Default Communication Device"
5. Check the microphone levels by right-click on your Quantum headset. Then click on Properties
6. Choose Levels.
7. Adjust accordingly.
Please also make sure the volume control on the headset is turned up. Rotate the volume wheel on your headset to increase the volume.
Check that your headset's Game-Chat balance dial and ensure that the balance is correct, you might refer to the screenshot below from the QuantumEngine PC software.
If you still cannot hear the game or music audio, or if the volume is still very low, check if the TalkThrough is activated via the QuantumEngine software.
Finally, you can also do a short press on the Smart Ambient button on the headset (if your headset, has this feature)
Game-Chat Balance SupportFor JBL Quantum 100/200/300 models, they do not offer Game-Chat audio dial function.
To get the Game-Chat dial feature, you need JBL Quantum 400, and up, then you can adjust game-chat balance by rotating the dial-up and down.
For models that support Game-Chat dial, when you rotate the dial, you will feel a notch that indicates 50% game and 50% chat. Or you can see the status on the top bar of the JBL QuantumENGINE.
Purchase parts for Quantum headphonesReplacement parts are available from authorized dealers and Service Centers. Please contact our JBL customer service department for more information and contact details.
How to switch between Game and Chat balanceYes, you can adjust the game and chat audio balance by rotating the dial-up and down. When you rotate the dial, you'll feel a notch that indicates the balance is 50% game and 50% chat. The slider on Quantum ONE is different and has no notch but instead a visual indicator.
How do I request or purchase peripheral parts for my JBL Quantum headset?
Replacement parts are available from authorized dealers and Service Centers. Please contact our customer service department for more information and contact details.
Physical damage on headphones
If your JBL Quantum headphone is under warranty, you can visit our Support Site at
How to set up your microphoneEnsure that only one voice chat application is in use while in-game. Be sure you hear a click when the microphone is flipped down. The microphone will only function when it is flipped down fully. If you see a red LED on the microphone, it is muted.
Check that the PC is using the correct recording device.
1. Go to Control Panel
2. Select Sound
3 Select Recording
4. Make sure to select the proper recording device.
- Right-click on it Quantum headset.
- Now select "Set Default Device" or "Select Default Communication Device"
6. Go to Properties
7. Chose Levels and adjust accordingly
What's in the box?
Your JBL Quantum 400 includes the headset, a USB Type A to C cable, a 3.5mm cable, QSG l Warranty Card l Warning Card, and a microphone windshield.
Mic Monitoring SupportYes. You can configure the volume of the mic monitoring in JBL QuantumENGINE. The default setting of the mic monitoring is "OFF”.