Any Krell amp is a dood amp. I have not heard the MDA 300 tho. I have hade a lot of Kreel amps and I can say the older amps are quite good. I have the FPB 400cx now and love It. The CX series do sound very warm and natural not bright at all like the older amps did. I like the 400CX better than I did my 250Ms Mono Blocks. If you go with the MDA 300 Mono Blocks I would have them looked at. Good luck.
