I don't have Revels but have a pair of 4 ohm Dynaudio Contour 3.4s which are not all the efficient (mid 80s). Presently I'm using a Wyred 4 Sound ST-250 with very good results. I also have a B&K 125.2 and sonically I like the Wyred 4 Sound amp better. Another nice thing about the class D W4S ST-250 is that it's power consumption at idle is only 10 watts.
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