I have been searching through the forum posts for information related to this problem, and have found some things that are similar, but wanted to ask the question here.
I purchased a Gain Cell DAC and Stellar Phono Preamp early this year for use with my existing speakers and amplifier. I was initially very happy with everything and amazed at the sound. After a few months I had an episode with my existing amp, a JVC M-3030, where I got some very loud electronic sounding pops from one speaker, and blamed it on the amp. Since this amp was over 40 years old, I decided to complete my PS Audio system with new M700 amps, and no longer got the loud sounds so I though that the issue was solved.
The setup now sounds fine, but I have noticed a gradually increasingly loud pop from one channel when powering off the system. The effect is not noticeable on the other channel. The problem appears to be much louder if I have been using the Stellar phono preamp, but I am assuming that’s because I have the gain turned up more for that source. The issue is still there when using the digital inputs for the CD player or my Bluesound streaming box but at a lower level. It sounds like a static discharge, and is almost deafening with the gain set at 30. This always happens only the left channel, never the right one.
Today, I decided to swap the connections from the GCD to the M700s. Now the pop is coming from the right channel! I changed RCA cables connecting the GCD and M700 to make sure the cable wasn’t the problem, but that didn’t have any effect.
So here I am, many thousands of dollars later, with a system I am getting increasingly afraid to use. Something is clearly not right with this. It’s bad enough that my new equipment has this problem, but I am worried that this will damage my speakers. That would really upset me.