So you’ve turned on your QC while its output is connected to a live input. Bzzzzzzzz.
Here’s how I’ve dealt with that.
I assume that you’re sending one or both of the XLR outputs to a stage box or directly a mixer, and that at least one of the QC send outputs is unused.
Plug a TRS-to-XLR cable from a QC send to an input on stage box/mixer. Turn that channel’s trim all the way down and mute the channel.
How it works: the ground wire in the extra cable connects the signal ground in the QC to the signal ground in the mixer, which means there’s always a ground connection, even before the QC establishes its XLR output grounds during boot.
My QC is connected at home to an active speaker via a TRS cable and i have a static hiss i cant get rid off too, already tried getting my powerline clean and all the stuff. Do you mean i have to use another mixer/speaker to get this effect?
Industry best practice: turn on the sound-producing device (QC in this case) before turning on any power to speakers. Do the reverse when powering off. Always always always.
To clarify: The QC main and send outputs must go to the same mixer. That’s the only way this’ll work.
Also, this trick depends on using XLR connectors, hence the mention of a stage box and the mixer to which it sends your signal. You might get lucky if you try this using 1/4” TS cables, but I wouldn’t bet on it working as described.
I agree about best practices. Power your input devices first; power amps last. Always! However, for the case where the power glitches while you’re playing at volume, this trick does eliminate the several seconds of hum until the QC re-establishes the XLR ground after the power glitch. Belt and suspenders, eh?
