I once owned the RM-10 Mk II. I was on a high-efficiency kick, and went through a pair of Lowther Alerions (with the DX-55 drivers, very nice), some Fostex drivers in BLH cabinets similar to BK-16 kits, and Audio Nirvana 12" drivers in bass reflex cabinets made by Tekton Design, as well as a Fi X and some George Wright monoblocks, both 2A3-based designs. The RM-10 acquitted itself quite well, and was easily the most versatile of the amps mentioned. I felt it a good match not only with the high-efficiency speakers, but also with a few monitors (Taylo Reference, for one, losing track of the others that passed through my hands -- it was a wonderful, prolific time for my audio addiction). Not only great sounding, the RM-10 was also dead quiet and cool running, and has a reputation for bullet-proof reliability.
The immediacy of full-range drivers is compelling, but in my room (at the time), I found that Maggie 3.6's, although much less accurate and reportedly high in distortion, were just more fun, and better suited to my penchant for Rock and Roll. Had finances permitted, I would have kept both systems, the RM-10 with the Alerions, and the Maggies, with the succession of powerful amps they required. Now that I'm in a much smaller room, the Maggies are long gone, and the RM-10 is again high on my wish list.
Congratulations on your purchase. It's a fine amp.
