My ethernet run is 35 feet so high-grade audiophile cable would be expensive. But tell me more about the network filter or isolator.
BTW, I don't hear any homoginazation on my Pass Labs equipment. My preamp is a newer issue (XP-30) with three boxes, one for power and one for each channel. I replaced an ARC Ref. 3 with it, and it is as good as the Ref. 3 and superior in clarity and clean soundstage. When I say clean, the soundstage might not be as large as the Ref. 3, but it is quite exact in separating and placing instruments. It's very highly reviewed. And, of course, my ultimate test is with well-recorded records which sound amazing on my system.

