Try lifting the ground on the Decco and the McCormack one at a time.
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Hi all, so I finally picked up a couple of 3-2 cheater plugs to try and lift the grounds on the Decco and power amp. Sure enough, lifting the ground on the power amp solved the problem, the buzz is gone!
Any ideas what my next step would be? I don't want to leave the amp ungrounded permanently because I know the risks it may pose. Thanks a lot!
I had a ground loop which was causing a VERY audible hum coming from my speakers when I had my McCormack DNA-1 Deluxe hooked up to my TLC-1 Deluxe preamp. Before that I had a Threshold 400A hooked up the the TLC-1 Deluxe and the hum was there as well. Both amps were plugged into the same outlet. I had a ground loop that I just couldn't isolate.
I ended up using an Ebtech Hum X Ground Loop Hum eliminator to remove the hum. It worked in my system. The hum was no longer audible. I know this isn't well regarded amongst the audiophiles here but it worked for me.