Hi @Damir
So firstly I think your asking the wrong forum for a fix
If the CQ18T doesn’t let you sum the Bluetooth channel to mono, that’s an Allen & Heath issue and not a Stage Traxx issue, and they’re the ones who need to add a mono option on either the Bluetooth channel or the main outs, so asking on their forum or email is the best way.
Also worth pointing out: Bluetooth audio is always compressed. You’re losing both low-end punch and high-end detail. It’s a compromise for background music between sets, but if your show relies on full-range backing tracks, it’s not the best choice.
Best practice is to run Stage Traxx via CKK camera connection kit and USB into the mixer.
I personally use a Lindy active cable, I have 8,10 and 15m versions
USB keeps the already digital file in the digital domain and there’s no unnecessary A/D conversion,
no Bluetooth compression, and your full audio spectrum is preserved exactly as intended.
It’s rock-solid and the right signal path for live shows.
Also it carries usb midi which you could control elements of your mixer
If you need mono today:
• Run a cable into two mixer channels and pan them center, or
• Use a mono DI/summing adapter before the mixer.
Radial make a stagebug DI has both stereo jacks and an XLR output ,when single XLR output is used it sums to Mono