JBL Quantum 300
|Driver sensitivity at 1kHz/1mW (dB)||100 dB SPL @1 kHz / 1mW|
|Dynamic frequency response range (Hz)||20 Hz - 20 kHz|
|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 300 headset
- 1 x USB audio adapter
- 1 x Windshield foam for boom microphone
- 1 x Quick Start Guide
- 1 x Warranty card
- 1 x Safety Sheet
FAQs & How-Tos
No sound in my Quantum headphones
Make sure the headset volume control is turned up. Rotate the volume wheel on your headset to increase the volume. If you're using the USB dongle, check that the correct playback device is selected under Control Panel > Sound > Playback. Select the proper playback 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.
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. 5. Check the microphone levels by right-click on your Quantum headset.
6. Go to Properties
7. Choose Levels and adjust accordingly
Xbox InformationAll JBL Quantum headset models work only through 3.5mm audio jack (aux) connected to the Xbox controller. You cannot connect to any Xbox Series console via Bluetooth.
Please note: JBL QuantumENGINE is only available on PC.
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 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.
Does this headphone support JBL QuantumSURROUND?
The JBL Quantum 200 is not equipped with JBL QuantumSURROUND. You can consider to purchase the Quantum 300, which comes with a USB dongle and access to JBL QuantumENGINE.
The JBL Quantum 300 headset is compatible with PC, PlayStation, Xbox, Nintendo Switch, Mobile, Mac and VR.
You can also use the included USB dongle on PC, PlayStation and Mac.
What's in the box?
Your JBL Quantum 300 includes the headset, a USB dongle, QSG l Warranty Card l Warning Card, and a microphone windshield.
Which products are supported by the JBL QuantumENGINE software?
JBL Quantum 300, 400, 600, 800, ONE are now supported with the PC software.
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.
Physical damage on headphones
If your JBL Quantum headphone is under warranty, you can visit our Support Site at
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.
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 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.
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
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.
PlayStation InformationThe compatibility for JBL Quantum models on PlayStation 5 is the same as it is for PlayStation 4 models.
All JBL Quantum headset models work through 3.5mm audio jack (aux) connected to the PlayStation controller. USB models will also work on PlayStation. In addition, the wireless models works wirelessly when connected to the 2.4GHz USB dongle.
Please note: JBL QuantumENGINE is only available on PC. Custom lighting can be set up on PC, and will carry over when connected with USB cable or 2.4GHz USB dongle.
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.
Does this headphone support JBL QuantumSURROUND?The JBL Quantum 100 is not equipped with JBL QuantumSURROUND. You can consider to purchase the JBL Quantum 300, which comes with a USB dongle and access to JBL QuantumENGINE.
Can’t find what you’re looking for?
Please note that UK delivery times are up to 10 working days.
However, due to current travel disruption to the UK, deliveries may take longer than planned.
We thank you for your patience.