In my best system I run AG horns, my current Trios are something like 102 db sensitivity or even higher. They pick up tiny hums, noise, sometimes I think even insects walking around stealthily in my basement. I've run many amps, low and high power tubes and low and high power solid state, and always encounter what I call ground loop issues. Get out your cheaters and lift all the grounded power plugs, disconnect unused circuits throughout the house, etc, to no avail. Still the damn hum and noise.
My cure, courtesy of Steve McCormack, now running SMc Audio.
The music source is not the problem. Make a triangle from your pre-amp to both mono blocks, all three legs. Ground them to each other, all three legs. Unhook your sub if need be. Voila, hum is gone, as is any stray noise. Now, you would think the third leg is redundant. ie the Pre separately linked to each block, and thus the blocks have a hardwire ground to each other via the Pre. Well, I did that, two legs instead of three,rid myself of most hum and noise, yet still had some audible hum and noise. Connecting all three legs equals dead quiet, and perfect source music.
Sound illogical? Too much work? Hey, it blueprints perfectly in the ground plane, and I use solid copper wire, like 14 or 16 gauge, doesn't need insulation. Simple really. Avoid 12 gauge solid, not malleable enough, and any stranded copper, not worth the fuss for grounding. I don't know how you feed music to your sub, but I'm sure you can hook in after you know the noise is gone. Good luck. Best regards, Joel
My cure, courtesy of Steve McCormack, now running SMc Audio.
The music source is not the problem. Make a triangle from your pre-amp to both mono blocks, all three legs. Ground them to each other, all three legs. Unhook your sub if need be. Voila, hum is gone, as is any stray noise. Now, you would think the third leg is redundant. ie the Pre separately linked to each block, and thus the blocks have a hardwire ground to each other via the Pre. Well, I did that, two legs instead of three,rid myself of most hum and noise, yet still had some audible hum and noise. Connecting all three legs equals dead quiet, and perfect source music.
Sound illogical? Too much work? Hey, it blueprints perfectly in the ground plane, and I use solid copper wire, like 14 or 16 gauge, doesn't need insulation. Simple really. Avoid 12 gauge solid, not malleable enough, and any stranded copper, not worth the fuss for grounding. I don't know how you feed music to your sub, but I'm sure you can hook in after you know the noise is gone. Good luck. Best regards, Joel