I ran into a similar situation when I owned the 683 S1. I did modify mine a bit but nothing extravagant. I replaced all the internal wiring with Transparent Audio's 14/2 cable, took out the stock stuffing and replaced it with lambs wool. It didn't cost much to do and wasn't that hard either but made a decent difference in the sound stage and the bass response. I, too, was using Rotel be it the 10 series RC1090/RB1080 2ch set up.
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