I had the earlier Evo series and a PS Audio HCA-2. Neither of these have "similar topology", and neither do the others you mentioned as they are not ICE modules. Personally I felt the PS Audio was greatly overrated, thin sounding and kind of grainy with much lower resolution that the Bel Cantos, just my opinion for those who like the amp so no flames please. The Evo was and is a great amp, the Ref1000's I replaced it with are not as much of a leap forward. They are however even more dynamic that the briged Evo6 I had which was 380wpc, sound ever so slightly more laid back, and are much smaller if this makes a difference which for me it did. A huge difference, no...but as I said the Evo was a great sounding amp so it takes a lot to better it.
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