thieliste,
I used Both Parasound JC-1 monoblocks then (mainly) Krell FPB 650M monoblocks. I always felt the JC-1s were having a little trouble when pushed with the 7.2 speakers. I never had that feeling with the Krells. Also, I thought about trading in my 7.2s for the 3.7s but for some reason always like the 7.2s more.