I have a Pass Aleph 3 (single ended) paired with an Aleph P and there is a very slight, single thump when powering down and a even less audible thump on power up. Neither is a problem at all.
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Thanks for sharing your experience, Dill. Indeed the thump is not slight although I didn't use a sound level meter to measure it. But the most concerning thing is the persistent retraction of the woofer which, I think, causes the bass response degradation.
I am guessing that you don't suffer the woofer retraction problem right?
1)Is the amplifier running off some sort of a power strip or power conditioner? If so, run the amp directly from the wall outlet. No power conditioners/strips.
2)can you run balanced? Is your rpeamp balanced?
3)double-check all conncetions, speaker cables and everything.
4)is the power cord on the amp original? Ground pin intact?
5)how efficient are your speakers?