I have First Sound paramount mk 2 pre and Shangling sp 80 c power amp and like to upgrade power amp , Manley Snapper ,Vtl ,Quicksilver or some high - end tube amps ,I have olso Krell fpb 750 mcx mono and Krell kps 25 sc cd/pre and Elac fs 609 x - pi . My FS mats not very good for Krell .