2. amps-preamps
  3. 1013299943

Buzz originating from amp...please help ?

I bought a Pass X250 through Audiogon and when hooked up to my system, a hum or buzz is coming out of the tweeters and midrange speakers on both channels. After exhaustive trial and error, I find that the buzz does not exist when the amp is not hooked up to any other component. It is of course connected to the speakers. If I attach a pair of interconnects to the amp (whether or not these interconnects are connected to the preamp), the buzz comes back. Does anybody have any ideas what I should try, or what the problem may be? Thanks for any imput.
jcambron
tpsonic
1,092 posts
 
Jcambron, You may have a ground loop. Is it possible to use a cheater plug on the AC line cord{convert 3 to 2 prongs}. You can also take a small gauge wire and try connecting the chassis of the amp to different components to see if the level or frequency changes. My system had a similar problem and this seems to help. Good Luck! Tom
jcambron OP
21 posts
 
I have tried using a cheater plug on the amp as well as all other components in the system with the same result. I have also used an ungrounded cord on this amp which I borrowed from a subwoofer and got the same buzz as before.

Thanks.
aaronm's avatar
aaronm
99 posts
 
Jcambron,

While you didn't say either way- hopefully you've tried different interconnects between your amp and preamp. If that doesn't work or you don't receive other info here that solves your problem, I would suggest emailing or calling Peter or Wayne at Pass Labs. They are both very concerned with ownership satisfaction and have a great deal of knowledge. Their website should have all needed contact info. www.passlabs.com Best Regards, Aaron
jcambron55c3
2 posts
 
Thanks Aaron. As a matter of fact, I wrote Peter @ Pass last night and will look for a reply early next week. I may just call them on Monday. I tried every combination of interconnects I can think of and still it buzzes. I am going to look in the Audioasylum archives on ground loops today to see if I can find any good ideas.
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