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Hum when running 2 REL Subs - Question

64.121.236.24

clesko@hotmail.com

Hello

I have 2 REL B2 Subs running Left and Right Channel from an Aesthetix Atlas Stereo amp. Using the REL supplied 3 wire arrangement or two dedicated Signal Cable (2 prong without the 3rd ground wire per the factory), I get a hum out of one sub. The manual isn't very clear about wiring, but I have tried most combinations. I have also moved the electric supply to two different legs...I don't have a 3rd run convenient to isolate all three components.

I am wondering what to do next. My goal is to keep the signature connection that is unique to REL...using the speaker taps from the amp, but the hum has to go. I'm wondering about using the same negative from either the left or right amp channel? There is an arrangement like this in the manual, but it is really unclear to me. The positive would be unique left and right to each sub, but a common negative.

Any help in running stereo subs and getting rid of hum would be much appreciated.

Follow Ups:

RE: Hum when running 2 REL Subs - Question - fantja 18:13:31 08/28/15 (0)
Keep us posted -clesko.
REL subwoofer(s) are the best out there. Hope you find the source of your "hum" soon.
RE: Hum when running 2 REL Subs - Question - clesko@hotmail.com 18:08:13 08/28/15 (1)
I'll post the final answer here in case anyone else comes across this thread.

Thank you first of all to the replies herein, both were instrumental in taking me down the road.

REL's website does not show a wiring scheme on how to connect a differential (balanced) amp when running 2 subs in stereo.

The following is only for High Level Neutriks connections: The answer (at least for my REL B2) is to twist the Red and Yellow lead together and put the combination to the positive lead of one channel. The black wire is to be "floated", which is to say tape it off and do not connect it to anything.

Ground is to come by means of RCA connection from the REL sub to an unused RCA tap on one's preamp. On the B2, and many of the REL subs, the High Level and Lo Level connections are active at the same time, therefore connecting the Lo Level provides a ground.

There remains a very low hum that I have to work on, but no where near the level that was present, and the smearing of the main speaker signal is gone.
- RE: Hum when running 2 REL Subs - Question - gbeard 05:08:44 08/29/15 (0)
  Try touching the grounds to the chassis screw (or better yet, a ground post)' you may find the last bit of hum disappears. I've had to do this with bal amps even with my single rel sub. As another poster said, it works with my Pass. Good luck!
REL's website tells how to properly hook up 2 subs. - artemus 06:45:08 08/27/15 (0)
Sorry I don't have a link but I just saw this info yesterday. I cannot remember exactly how it was laid out though. So I won't guess
=========================
You paid HOW MUCH for that electrical receptacle?!!! Are YOU nuts?
RE: Hum when running 2 REL Subs - Question - Tidycat1 19:15:13 08/26/15 (0)
Is the Atlas a balanced design? If so ,then the negative terminal on the amp is not ground.Both channels float.You may need to find a common ground terminal to operate the REL.
This has been a problem with Pass amps as I understand it.They are now installing a ground post for this installation.
Tom:cat

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