Speaker Hum

[Evorgeloc]

Hello – I’ve just unpacked my CQ 18T – plugged main out into Bose L1 Pro32+Sub 2 – perfect… however on Aux 1 to a monitor as soon as monitor volume turned up there is an unacceptable hum – it sounds fine except for this hum. I’ve tested both cable and monitor on other devices and no hum. Also tested with a different monitor from aux 1 and same hum. I’d be grateful for a pointer in the right direction if anyone has any ideas. And whilst clearly I’m being lazy here’s a bonus question, how do I get the same reverb effect on aux 1 as outputs on the main output. You will now realise I’m not technically savvy… but am already seeing the potential of the excellent CQ18T Thank you in anticipation

[Mike C]

Are you using a fully balanced cable connection as in a TRS 1/4 plug cable to the monitor?
Are you converting from the 1/4 plug to an XLR at the monitor.

Do you get the hum plugged into other aux outs on the mixer?

[Evorgeloc]

Thank you Mike for taking time to respond… I’m using standard speaker TR (or is it TS?) in other words 2 pin/wires not 3 cable…
Same hum from other ports… however it is much reduced to an acceptable level by lowering the volume on monitor and upping the output from mixer…

[Mike C]

Two wire cables are a TS plug, tip sleeve. You should be using full balanced TRS (tip, ring, sleeve) cables or a small TRS to XLR male adapter cable and use a standard XLR mic cable from there to the speaker.

You said “standard speaker” speaker cables are not shielded and should not be used for line level interconnections or as guitar cords.
If you are indeed using a speaker cable that could be part of the problem.

[Evorgeloc]

Thank you Mike

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