I didn't have a chance to hear in my system the Ref1000, but I've heard other ICEpower amps and have owned the eVo 4 mk II for almost two years.
In my system and to my ears, the ICEpower amps are MUCH better than eVo 4. The highs are better resolved, soundstage MUCH deeper and midrange MUCH fuller (although still not up to SET standard).
In my system and to my ears, the ICEpower amps are MUCH better than eVo 4. The highs are better resolved, soundstage MUCH deeper and midrange MUCH fuller (although still not up to SET standard).