Unwanted Stereo Speaker "noise" remedy by grounding ?

LarryFine said:
Okie-dokie. The B&K preamp-processor in the pic has been replaced with a Fosgate FAP-T1+, which only has a 12v, 15ma trigger output. The only relay I could find with a coil current that low was a reed relay, which can not withstand the coil current of the 4p contactor. (DAMHIK)

Thus, I cascaded a relay with a coil current the reed relay's contacts could handle, and contacts capable of handling the contactor's coil current. I chose an ice-cube relay with 10a contacts. The two relays are on perf-board in a plastic package, in the panel with the contactor.
Click to expand...
So what does the contactor do?
 
Little Bill said:
So what does the contactor do?
Click to expand...
The four switched circuits supply:
1. The 2x 300w amp; left/right front speakers
2. The 5x 200w amp; center/side/rear speakers
3. The two 300w subwoofer amps
4. Various ancillary components

There are two non-switched circuits:
1. The preamp-processor (and relay circuit)
2. The ceiling-hung 8" CRT projector

And two unused circuits; possibly lighting, etc.

I chose the GE 4/8 panel specifically for the offset interior, which allowed space for the contactor.
 
Thats a cool system Larry, back when home theater was more popular and I was doing that work I found the 'noisy' systems to mainly be off 120/208 panels in complexes fed from 3-phase supply, I never figured out if it was correlation or coincidence.
I have seen all kinds of gismos and gadgets that people had me install claiming to reducing 'noise';
One funny one was a capacitor in a potted box basically a whole home filters that supposedly will also 'reduce your electricity bill'
Another was these $200 outlets from monster cable..
But after I learned about it I always found the 60/120 system was the most effective when noise was a real issue.
 
powerplay said:
Stereo Speakers with old amplifier and turntable is making "noise' when led lighting on a dimmer is on. Circuits come from the same subpanel in the basement but someone has told the person to eliminate the ground loop and isolate the "ground/bonding" by installing a rebar into the ground and connecting it and disconnecting the ground from the stereo plug. Is it possible that running a cable directly to the Main Panel only for the Stereo would possibly help eliminate the "noise' coming over the old speakers ?
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Does the noise level change with different brightness settings on the dimmer? Is the noise still there if you disconnect all the input cables from the amp?
 
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