How To

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.

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.

1. Download the software bundle by clicking here . You will download a zipped folder called “SA750 v1542 Reflash Bundle.zip”
2. Unzip/extract this folder (some computers will do this automatically). Inside the folder you will find 2 more folders named “Step 1 V1206 V1.72” and “Step 2 V1542 V1.72”
3. Double click on the “Step 1 V1206 V1.72” folder. Inside you will find a file named “image.swu”
4. Copy this image.swu file to a blank USB memory stick.
   • NOTE! The file MUST be called image.swu. If you copy the file to a location where there is already a file called image.swu your computer may rename the file automatically (for instance as “image.swu (1)”. Please double check that the file is called “image.swu” when on the memory stick.
5. Power off the SA750 from the hard power switch on the rear of the unit immediately above the mains inlet socket.
6. Insert the USB memory stick into the rear of the unit.
7. Depress the recessed service switch (above the CD input connector sockets) and continue to keep it depressed.
8. Power the unit on whilst keeping the service button depressed.
9. Keep the service button depressed for at least 30 seconds after power on.
10. Release the service button.
11. Leave the unit for at least 30 minutes to update.
12. Perform a NET reset (MENU > SYSTEM SETTINGS > NET RESET).
13. Perform a SYSTEM reset (MENU > SYSTEM SETTINGS > SYSTEM RESET).
14. Functionality should now be revived. To update to the most current software version repeat points 3-13 above but using “Step 2 V1542 V1.72” at point 3.     

1. HDMI INPUT Supports 4K
2. Chromecast streaming in 4K.
3. 4K Material through the Android TV System.

If the earbuds go into standby mode and turn off, you can still use them without putting them back into the charging case. 
You can reactivate the headphones by pressing or touching the outside earbud itself.
Please note: They will be automatically powered off after 30 minutes of being in standby mode if they disconnect from Bluetooth. To reconnect, you will need to put the earbuds back in the charging case and take them off again. 

It is possible to change the standby mode time with your headphones. To do this, go into the My JBL Headphones app and choose the Standby Time via Auto-off function. You can adjust the time to 15min, 1hr, etc., or you can choose “Never” if you want to keep the earbuds turn on at all times. Once you set the Auto-off, the earbuds will work according to the setting whether they connect to Bluetooth or disconnect.
 

SOUNDGEAR SENSE

Software Update Release Notes

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Version:  V 2.9.0

Release Date: April 1, 2025

Release Media: OTA (over the air) Update through JBL Headphone App

What’s New

1. Add support for Google Find My Device

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Version:  V 2.3.0

Release Date: May 14, 2024

Release Media: OTA (over the air) Update through JBL Headphone App

What’s New

1. JBL Headphone app stability improvement

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Version:  V 2.2.0

Release Date: Decemeber 14, 2023

Release Media: OTA (over the air) Update through JBL Headphone App

What’s New

1. Add Google Audio Switch support
2. Update Bluetooth name to 'JBL Soundgear Sense'
3. Stability and performance improvement