Do you have hum just coming from the amp or do you hear it in the speakers? I have 2 lexicon RX-7s which I think are similar to the ATI. One hums a bit but it’s in a rack in a closet and speakers are dead silent. Like you they are on dedicated 20 amp lines with shunyata viper cables. I have never chased the hum but now I’m intrigued if something in the chain is causing it. I did have DC offset coming through two Fathom f212v2 subs from my plasma and tivo mini. I got a $15 screw on for th tivo mini which took it down 50% Andy then still needed an emotiva CMX-2 for the subs to take it all out. That is 15 amp though. I do have two furman P 8 Pro C units for sale on Pittsburgh craigslist and would be happy to post and sell them on here if you have any interest if that could help you out. They are one of the few 20 amp items I could locate that weren’t $$$$.
ATI AT6007 amplifier hum
Long time reader and first time poster. I recently traded in my Pass Labs X600.8 amps to ATI AT6007 and AT528NC combo for my 9.1.4 setup. I have 3 dedicated 20A lines which I’ve used previously for the pass labs and now for the ATIs. I did not hear a hum from the pass labs but I’m now hearing a hum from the AT6007. I’m also using proper 20A power cables. There is no hum from the AT528NC. Please advise. Will I need a DC blocker or power conditioner?