The full path: install, get Windows pointing at the right device, then set surround, EQ and microphone the way you actually want them.
Use the USB cable, the wireless dongle, or the base station. A 3.5 mm cable or a Bluetooth link will not be detected by the app.
It installs an audio driver alongside the app, which needs elevated permissions. Allow it when Windows asks.
Skipping the reboot is why spatial audio often looks enabled but changes nothing — the virtual device isn't live until then.
The headset should appear by name. If it doesn't, jump to the troubleshooting section below.
Headset, dongle and base station update separately. Keep everything connected and charged until each finishes.
This is the step most people skip, and it breaks everything downstream.
Open Settings → System → Sound and set your JBL Quantum device as the output. If you see both a plain headset entry and a Quantum surround entry, the surround one is what the app processes through.
In the same panel, set the Quantum microphone as the input, then speak and watch the level meter move before you go looking for other problems.
Windows remembers per-application audio devices. Discord, OBS and games each keep their own — check them individually if only one app sounds wrong.
Windows spatial sound and audio enhancements stack badly with QuantumSURROUND. Pick one; running both makes everything sound hollow.
Spatial sound on, and ease off the deep bass so explosions stop burying footsteps. Small treble lift, not a big one.
Spatial sound on, flat-ish EQ. This is where the wide soundstage actually earns its place.
Spatial sound off. Stereo mixes are already positioned; processing them just smears the image.
Set gain so normal speech peaks comfortably short of the top. Push it lower than feels right — clipping can't be fixed later.
Just enough to hear yourself. Too much and you'll unconsciously talk too quietly for everyone else.
Name each setup once and switch between them, rather than dragging sliders every time you change what you're doing.
Check you're on USB rather than Bluetooth or 3.5 mm, then try a different USB port — preferably one directly on the motherboard rather than a hub or front-panel port. Unplug, wait a few seconds, plug back in with the app open. If it still doesn't appear, restart the JBL background service from Task Manager, or reboot.
Almost always the default device. Set the Quantum output in Windows sound settings, then check per-app overrides for the program that's silent. Reboot if you haven't since installing.
You're likely playing through the plain headset device instead of the surround one, or Windows' own spatial sound is fighting it. Pick the Quantum surround output, and disable Windows spatial sound and audio enhancements.
Confirm the Quantum mic is the Windows input, that the boom isn't muted by the headset's own control, and that gain is up in the app. Then check whichever app is calling — Discord and OBS both keep their own device selection.
The app needs to be running for the settings it processes on the PC. Make sure it starts with Windows, and that no cleanup or optimiser tool is disabling its startup entry.
Leave the device connected and try the update again from the app rather than unplugging. If the device is unresponsive after a failed flash, that's a case for JBL support rather than a workaround.