Have you tried plugging the speaker power cords into the same receptacle as the rest of the equipment ?
Single ended to XLR Question
I'm really stumped on this one. I have recently purchased a pair of ATC fully active speakers which require a balanced XLR input at the speaker. The dealer recommended a set of cables with single ended outs from the preamp, so running single ended to xlr. When the speakers are powered up with the preamp OFF (McIntosh c2300) the speakers have a very audible hum. When the preamp is turned on the speakers are dead quite. I used the same cables with another preamp (Aesthetix) and the speakers are dead quite when the preamp is OFF! I then tried a fully balanced pair of cables (xlr to xlr) with the McIntosh preamp and dead quiet with the preamp off. So why would the single ended cable create no noise with the Aesthetix preamp in the off position and do the opposite with the MAC. Could it be that the Mac isn't a fully balanced premp? One of those things I can live with but trying to understand.....Thankyou.