It's probably dc offset from your preamp. I've heard of this happening with bat preamps and solid state amps. I'd contact bat and see what they suggest. Good luck!
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hi, i have a bat 3ki and a krell ksa 80. i have had some problems for the last 2 years and have sent back my bat 2 times and i am still getting a problem. it was mostly intermittent noise in my right speaker on humid days in the summer. bat said it was fixed , but there still is a problem. i now have occasional noise in my left speaker and the humidity is very low. right now i do not know if it is the preamp or the amp???? it is driving me crazy!!! can it be dc offset?? excuse me for jumping onto you forum.