Motu 828mkII power supply buzz--- use DC filter?

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I have a Motu 828mkII audio interface and the mechanical buzz from the transformers is driving me nuts!

I have tried tightening/loosening the mounting screws of the trannies but makes no difference. I guess the main mechanical coupling to the pcbs is via the solder points. There doesn't seem to be anywhere convenient or effective to mechanically isolate using rubber grommets.

Is there a cheap and simple external solution? e.g. build a DC removal filter to filter the AC from the mains? isolation transformer?


any tips appreciated!
 
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