May be I am wrong, but I thing the ARC210 needs a real balanced preamplifier - I am not sure it can be used with the ACT2. Anyway I currently own ARC and have owned the ACT2 and the 350 - an excellent setup - but I thing that the two brands do not mix well - I was never pleased with the mix of cj and ARC.
BTW, the REF210 when fitted with the KT120s is a much better sounding than when using the 6550s - it seems much more open and powerful.
BTW, the REF210 when fitted with the KT120s is a much better sounding than when using the 6550s - it seems much more open and powerful.