2. amps-preamps
  3. 1236409165

Strange ground loop...?

Hey,

I just hooked up a new amp and I'm having a strange noise issue. Only in my right channel, I get this high-pitched whine... maybe around 2khz. My left channel is dead silent.

The problem seems to be an interaction between my DAC and my amp. If the DAC is off, the amp is silent.

The amp is an 84' yamaha, so the cord has no ground. There is a ground screw, though, and I have connected that to my power conditioner, hoping this would solve it... nope.

I've tried plugging the amp straight into the same outlet that the power conditioner is plugged into (into which the DAC is plugged in). That actually did work... but I don't want to run my amp straight into the wall.

I suspect I just need to find a proper place to run that ground wire...

Any ideas?
djembeplay
djembeplay OP
169 posts
 
Another update -

I just swapped out one of the BlueJeans ICs with an old Monster IC I had and the problem is completely gone... no whining or distortion at all.

Unfortunately, I don't want to use my old Monster cables... so I guess I will have to send all my BlueJeans cables back and get something else. Bummer.
kijanki's avatar
kijanki
3,575 posts
 
Bob - what do you mean by "coax interconnects"? Are you talking about digital cable?
djembeplay OP
169 posts
 
U guys think I should just try some different cable?

I seem to be out of options with my current BlueJeans LC1s.
Post removed 
djembeplay OP
169 posts
 
You think so? IDK, it seems weird that just swapping out one of the interconnects fixed everything...

Plus it isn't the typical 60Hz humm.. it's like 2-3 kHz... more of a whine. Also, there is that strange distortion in my lower bass region.

All I can think is there is some sort of interference between 2 BlueJeans cables that are near eachother and have a different magnitude of the same signal going through them (the one after the pre-amp will be attenuated unless it's at full volume).

Sucks...
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