I have heard both and was not impressed with either. The Luxman IMO is the better sounding amp but it is nothing special. I've read you need to move up to the 507 to get most of the Luxman house sound. The MAC 6300 is a very fragile sounding 100w/ch amp, it was gasping for air trying to drive an ATC-scm 11. I assume you need/want at least 100w/ch. Take a serious look at the Marantz PM-11s3. I've heard the 11s2 and IMO it's a true high-end amp and is conservatively rated at 100w/ch. The latest version(s3) is claimed to be even more refined.
