I have a pair of 611s being fed by a C2700. The 611s are incredible, with outstanding bass and a beautiful midrange. My only itch to upgrade would be a pair of MC 1.25KWs and a C12000.Â
When I auditioned the Macs, the only amp that I found close (within the price range) was the Luxman M10X. The Luxman had an ever slightly better midrange (a little more accurate) and more accurate highs, however, it could not match the bass of the 611's. I actually preferred the McIntosh midrange, which is warmer than the Luxman.Â