squeezbox Duet distortion

Hi,

I just hooked up my Duet and with most songs I have horrendous distortion at moderate listening levels. It is especially bad in the Live Archives but is present on all stations. I have the Duet going into a Monarchy DIP to a DAC and there is so much crackling and popping it verges on unlistenable.

Could someone please tell me how to fix this. I'm hoping and praying there is one.

Thanks

Pete