I did some poking around with my multi meter.That's what interests you.
Now work your way backwards:
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(@restorer-john better not see the solderwork of the input board )
I suppose I'm just used to our input board designs as I can easily trace continuity from input to output.There is seldom continuity from signal input to output on a PC board that has, tubes, transistors or op-amps.
hopefully offer suggestions to Tom at PSA, but he has made it clear on AVS that the issue is dirty mains power and there is nothing to be seen here
I'll write a strongly worded letter to my power company.Oh, that dirty mains power issue ... all that rubbish within it .... someone really should clean this up ...
I'm going with my original theory, faulty design or faulty manufacturing.Oh, that dirty mains power issue ... all that rubbish within it .... someone really should clean this up ...
It is an Ice Power 700AS1 (x2) amp design.If it is a Hypex OEM plate amp, maybe your buddies at the ampco can slip you a schematic and PCB layout by a back channel. There is probably a part number inside.
Note to self: Never buy a PSA subwoofer (I was actually considering upgrading my dual SVS SB2000 to dual PSA's S1512M). I've now decided to go with four SVS SB1000 Pro instead for nearly the same
Not sure you can say that as a definite answer. Many company's have problems which they don't even know about and when it comes to their attention they fix it. Some don't but real company's do.. let's see what happens and then make judgment .Note to self: Never buy a PSA subwoofer (I was actually considering upgrading my dual SVS SB2000 to dual PSA's S1512M). I've now decided to go with four SVS SB1000 Pro instead for nearly the same price...
I also think I need Tom to clarify what he means by dirty mains.
You touching the plate amp chassis drains away the circulating currents enough that the noise is reduced.Only other interesting thing I found is if I don't have any XLR source connected to the inputs and I touch my hand to the plate amp chassis, the hum nearly disappears.
I asked to try it myself but was told no. Tom did offer to send an amp with a different nosie gate which has worked for others in the past. BUT the caveat is that sometimes the sub will shut off during content and people who have used the stricter noise gate have reported it sounds "worse" then distortion when it happens. So from what I've read/been told it isn't the best fix as it has its own drawback.@Buckeye Amps, I see the mentioning of DSP noise-gating here and over on the AVS support forum. We can see the DSP on your input board pics along with the micro-USB port. Has there been any offer to make that DSP software and instructions for use available to you to change the noise gate setting?
It's a cop-out.I also think I need Tom to clarify what he means by dirty mains.
Correction. That is very old news, my friend.Remember the PSA guyiswas part of SVS
Yea. I'm finishing my convo on the PSA thread as it is just turning into Tom coming back to "Well how can you explain some people how moved to a new house and the problem is gone" or "I can't reproduce any hum issues in my workshop" sprinkled in with "Every house has a different mixture of devices so you can't say mains issues are not affected by all these variables".It's a cop-out.