2. amps-preamps
  3. 149822-92009

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?
128x128kanfive
millercarbon's avatar
millercarbon
12,531 posts
 
Well you can always hunt around for one. However I seriously doubt that you really need it. 20 amps I mean.
twoleftears's avatar
twoleftears
5,317 posts
 
If you get hum from more than one component/brand, there's every chance of finding a solution to the problem.  In your case, with the silent-running Pass, I'm not so sure that these bandaids (e.g. DC blocker) will make any difference.  There are lots of threads of this sort.  I myself have been through this wringer (and I ended up buying different amps).  I wish you luck and success but be prepared for no easy fix.
mijostyn's avatar
mijostyn
8,507 posts
 
Kanfive. Call ATI and tell them what is going on. I suspect you need a new transformer. You can also check the transformer mounts. Some companies isolate the transformer from the chassis with special mounts. Check the hardware. In your case I believe your amp has two transformers. 
ricred1
2,000 posts
 
I had a hum with my ATI Class D amplifier that I use for HT. It was a ground issue that was corrected by simply running a inexpensive shielded wire from the ground on the amp to the ground on the Marantz preamp/processor. 
elevick
2,636 posts
 
If you unplug everything else, do you get the hum on the ATI?  Have you tried moving the ATI to another room and testing for hum?
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