I had a V12 stereo amp once and added a second stereo V12 to bi-amp my previous speakers, Proac Response D80. I thought one was not powerful enough. But so with two also. They just couldn't deliver tight bass notes. I think Cary V12's are amps most suitable for jazz, blues or other kinds of soft music. I sold mine and bought Theta Citadel (version 1) which was a huge improvement in my ears.
