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Buzzing IC's

Hi, I have an ARC LS25 mkII preamp and I've tried two different sets of the WBC Mogami 2549 shielded cables from Amazon. I'm using these between the preamp and my KEF KC62 subwoofer. They buzz when installed but when I throw on a pair of unshielded IC's no problems at all. Any idea what could be causing this? Thanks!

cetla416
audphile1's avatar
audphile1
4,159 posts
 

Try connecting one cable at a time and see which one buzzes. Sounds like a defective cable. 

cetla416 OP
23 posts
 

It’s the second set of cables reacting the same way. I’ll try one at a time and pushing in farther if possible.

kingsleuy
173 posts
 

Just a thought here.  Are you following the Arrow markings of the cables?  Signal flow From-To.  On the Source, preamp side, the cable Shield and Signal Ground wires are connected together.in the rca  On the subwoofer side connector, just the Signal wires are connected in the rca.  The shield is not connected.

cetla416 OP
23 posts
 

I've tried them in both directions on my subwoofer and amps with the same results. They work fine between my DAC and preamp. I'm baffled to say the least!

jengelmann's avatar
jengelmann
57 posts
 

Had a similar problem with an AV receiver. Was a ground loop issue. Are the subs and pre amp plugged into the same circuit?

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