Since a month or so I've got overmodulated audio from my setup.

My beolab speakers are connected to a BV7. When I select a video source the sound is fine.

When I switch to an audio source (radio of beocenter 6500, CD 6500 or an audio-2 input) I get overmodulated sound. Not very much but audible nevertheless.

The beocenter is connected to the BV7 via Masterlink and a T1611 converter.

 

Any idea's about this? Also there is a slight humm comming from the 6500. Could this be related if so do I need to replace some of the caps?

 

Thanks for all the idea's