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speaker buzz

209.136.24.246

acres verde

I'll try to be as brief as possible. Forever now I've had a problem with a steady state BUZZ, not hum coming equally thru my A/G Duos. They are powered by Atma monoblocs connected to an Atma preamp. The powered sub of each speaker and it's dedicated m/bloc are plugged into dedicated a/c outlets. Digital sources ( two transports, one DAC ) are plugged into dedicated outlet fed P 300 and the TT motor is powered by another separate P 300 on another dedicated outlet. System is run all balanced except the transports to DAC feeds which are BNC and RCA respectively. All of this is fed by a brand new whole house Square D service panel ( which, upon installation last winter, had no effect on the buzzing good or bad ). Input trannies on amps exhibit no mechanical noises. Speakers buzz when only amps are turned on and preamp/sources are shut off. The colder the weather, the worse the problem gets. Cheater plugs installed on power cords to both amps and subs does nothing. 10 meter balanced lines connect preamp to amps. Amp manufacturer is of the opinion that the buzz is higher order odd harmonic of the 60 hz ac sine wave.
Does anybody have any insight to share based on the above and, Paul, do you have any products that might address it?

Edits: 02/12/10

Follow Ups:

RE: speaker buzz - PaulMC 18:08:41 02/04/10 (6)
Is the buzz through the speakers or internal to the amps?
- RE: speaker buzz - acres verde 12:31:18 02/10/10 (5)
  It is a distinct, steady state buzz coming through the speakers. The amps, (OTLs, by the way) are silent. Sorry I didn't respond sooner.
  - RE: speaker buzz - PaulMC 05:19:47 02/11/10 (4)
    No worries. Remove the inputs from the amps and see if the buzz is still there. I suspect not. If it is, then there's a problem with the amps. If it goes away, you'll have to keep working your way back up the chain till you find it. Let me know.
    - RE: speaker buzz - acres verde 07:58:25 02/12/10 (0)
      I failed to mention in my last response that floating the grounds of the powercords to the two amps provides no relief either, so I've probably answered my own question about a ground loop buzz.
    - RE: speaker buzz - acres verde 07:43:46 02/12/10 (2)
      Paul, the speakers buzz with the pre amp outs disconnected from the amps. However, when I borrow and substitute the same brand of amps into the system, the speakers still buzz and at the same amplitude. Likewise, when my amps are substituted for his into his system, my amps and his speakers are dead quiet. I run my system all balanced. A 10 meter run of ICs connects amps and preamps. I don't know if this is germaine in any way but I thought I would mention it. I'm wondering if I am experiencing some kind of ground loop. Incidentally, each outlet feeding the amps is dedicated and is fitted with your Power Ports.
      - RE: speaker buzz - PaulMC 05:33:08 02/13/10 (1)
        
        In Reply to: RE: speaker buzz posted by acres verde on February 12, 2010 at 07:43:46
        
        Can't have a ground loop if there's nothing connected on the input. Did you in fact disconnect the preamp from the amps at the amp side? If so, then we have a power problem which we may be able to help with.
        
        RE: speaker buzz - acres verde 08:34:21 02/13/10 (0)
        
        In Reply to: RE: speaker buzz posted by PaulMC on February 13, 2010 at 05:33:08
        
        Correct. I get buzz with no inputs connected to the amps. All it takes to get this buzz is to have the amps turned on and the speaker wires hooked up. Floating the ground on the power cord to the amps changes nothing.
RE: speaker buzz - skytag 16:22:11 01/29/10 (1)
I have no insight into the problem, but I've noticed the same thing with a couple of my amps/speakers (I have an all monoblock system). Since it's not a problem when the processor is on, I haven't worried about it. Sorry I can't offer any more than that.
- RE: speaker buzz - pictureguy 21:33:20 04/14/10 (0)
  Hot / Neutral reverse on the amp?
  Picking up some emi / rf?
  Just for test, hook up speakers with some real short cables....just listen for the buzz.
  Too much is never enough

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