Thank you all guys. It was the Lyngdorf power amp 2175 that was causing the problems. I have changed the amp and no problems anymore. Last thing that I would have thought, but who knows what that thing is radiating and at what frequency (resonance or rather damping somewhere, PWM output....). Live and learn. The SB3 is better than many CDs. Deepest thanks for your help and concern. Best Ivan
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