After a few day running my new old stock PL 400 I have come to my conclusion on weather I like it or not. I have a pair of speakers that love power and need an amp with a lot of head room at high volume, I used to drive these speakers with a Carver TFM 55 and they sounded great. The stock PL 400 not so great yea they are loud but I can hear distortion like the amp runs out of gas (not enough head room) when I crank it. So the question I need to figure out is, is it worth putting money into building a WOPL 400, will it make that much difference or am I better off going up to the PL700, or maybe just get another Carver..... or just stop listening to music so loud! lol