i am currently using the Karan 650 mono block with my rockport mira grand II.. it does not sound like tube but the smoothness of the amp is like moving from cd to LP gear.. i replace my levinson 33H with these amp with the recommendation from my dealer and friends. i now feel no desire to change the amp anymore. it just sit and dissapear in my system, now i just look for other tweak here and there to make my system sound right
hope this help
hope this help