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Help me solve another speaker hum thread :)

My dealer recently installed a set of Sonus Faber Aida’s with 2x McIntosh MC901 monoblocks. I also have 4x dedicated lines.

The problem is I have have hum in both speakers (hum in the midrange only. The tweeter makes a different noise but I read that’s more normal?) One speaker is louder than the other. Neither changes with volume. The louder one can be heard at about 6 inches away, the quieter one needs my ear as close as possible to faintly hear anything. Sound from both is 50hz maybe 60hz hum. Both monoblocks also make a slight mechanical buzz that can be heard about 6 inches away.

If I have only one speaker, speaker cables, and monoblock powered (nothing else connected, powered, or even plugged in), it still makes the hum.

I have tried using a cheater plug for possible ground loop, also a DC blocker. Neither made any difference. What do you guys think the issue could be? Bad tubes?

Do I need to send the amps back? Or just live with it? I don’t hear from listening position or anything. Thanks in advance.

battbot

Showing 1 response by tablejockey

tablejockey
4,022 posts
 

 "Sonus Faber Aida’s with 2x McIntosh MC901 monoblocks."

Con$iderable investment there...

Noticeable hum at ANY level except at neurotic audiophool distance(press ear against the speaker) would not be acceptable IMO.

Get your dealer involved, he wouldn't want to see your gear come back.

Try all the simple things as suggested-reseat every possible connection. 

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