Class D is just Dandy!

Hello Al,

To shed a bit more light on the subject, and I don't know in what way it may effect your idea of the issue, but when the Class amp is out of service, and my SET 300 B amp is in use, there is no issue with noise. Even when my HT system is in use with the SET amp (I use a separate tube preamp that the front two channels are connected to, including having the processor stereo cables run to the two channel preamplifier).

So, my thinking is the noise emanates from the Class D amp, not from the cable box or processor.

Thanks again regards,
Dan 

Thanks for the additional info, Dan. But if I understand correctly it still leaves open the possibility that the DVR or its remote may be the source of the noise, as it would seem conceivable that the class D amps may simply be more sensitive to pickup of electrical noise that is present in their environment than the SET amp. Perhaps as a result of wider bandwidth, or differences in gain (which is typically higher for class D amps than for SET amps), or any of the many other differences that may exist between the two designs.

Obviously what I was speculating is a somewhat wild guess, but it was prompted by your mention of the effects of the DVR’s remote.

Best regards,
-- Al

@islandmandan , I'm with Al on this one. The amp should be fine with no input connected, go ahead and disconnect  the input and see if you still have that noise. If so => amplifier, if not => input

Thank you Al, Ralph, for your always valuable input. I will re-insert the Class D amp into the system (I was taking time off from the noise, and very much enjoying the SET 300B in the system), and try what you have suggested. I'm wondering why, though, a single module, in stereo mode, is quiet, but a dual module/single power supply with both modules set to bridged mode is so darned noisy?

Thanks,
Dan

@islandmandan , I don't have a good answer for that right now- but when we do this test then we will know more.