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Ive been wondering this for sometime now and picked up two Acoustic Revive RLi 1gb filers plus there latest Lan cable to be placed between my FMC ( fiber optical converter) and Melco N1ZH server. The improvement in SQ is very noticeable, While the units are burning in I placed the first RLi-1GB filer at the FMC, followed by the LAN cable, RL1 -1GB filter to server. After 16 hrs the improvement in midrange, upper frequency extension is like a cloth being removed from your speakers. Soundstage depth,width and tonality have improved as well.
If you have properly addressed your electrical then this would be your next area of improvement, isolation.
Do not under estimate the value of improvement in your systems electricity, Im not talking about 10 g romex AC wiring but wire that is properly insulated and designed for AC audio application.