I've owned the GNSC Reference modded RA Opus 21 and s30 for several years. I recently purchased the RA Cantata Music center. I've heard and demoed the C-50 extensively. I did not purchase the C-50 because it did not have the second set of speaker connections that the s30 had.
I would say that the C-50 is slightly on the warm side of neutrality. It is definitely not a overly warm/lush sounding amplifier. It is very open and and fast and very musical. I heard it drive a pair of loudspeakers that were 85 db efficient with no problem. However, I wouldn't think that 50 watts with your loudspeakers is going to blow the roof off your house :) If possible, I would try and demo if you can. Good luck.
I would say that the C-50 is slightly on the warm side of neutrality. It is definitely not a overly warm/lush sounding amplifier. It is very open and and fast and very musical. I heard it drive a pair of loudspeakers that were 85 db efficient with no problem. However, I wouldn't think that 50 watts with your loudspeakers is going to blow the roof off your house :) If possible, I would try and demo if you can. Good luck.