Hi,

The packetized data being transported across the network does not need cleaning, if there was a issue you would be hearing significant dropouts and/or clicking from your speakers not a change in SQ.

Arguably the quality of the SPDIF stream from the MS600 could be improved, for this I'd recommend replacing it with an 818.3 if funds allow.

That said investing in acoustic treatments for your listening room, is where I'd put my money first.

Regards,
Carl