I had the same problem in my system before.The problem was in my Audioresearch LS 2B.Try to find out if this could be the problem with your preamp.
Why do my Amps do this?
I have a pair of 140 wpc tube amps. Last night when I shut them down (after 3 hours of listening), I noticed that when I flipped the left switch my left woofer moved out and then in. Same happened on the right side. So I waited a minute or two and powered them back up. Same thing--each woofer "took one breath." When I powered them up this morning (after sitting idol for 7 hours), this did not happen. But everything sounded fine. I never noticed this happening with my last amp (45 wpc). Does this indicate a power surge that I should be concerned about? Thanks.
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