For what its worth, JGH once wrote about the PL 400:
"This and the higher-powered P-L 700 have a sound that is characteristically their own: A rather fat, rich quality that one normally associates with good solid-state units of considerably lower power (such as the Citation 12 and the Crown D-60), and the effortless openness that is a sure sign of oodles of reserve power. Both however also have a noticeably fine-grained or 'gray' quality that is substantially less conspicuous in the 400 (which in turn has a shade more of it than the Crown DC-300A). In addition, although it is not easy to overload the 400, it does not respond very gracefully when it is overdriven (usually on heavy, sustained bass passages), and takes a perceptible period of time to recover.
"All in all, we would judge this to be a less successful design than the Dyna Stereo 400 (which sells for $100 more), but would rate it as being the best solid-state amplifier in its price class."
Seems to corroborate Sean's comments, not that we need JGH to corroborate Sean.
"This and the higher-powered P-L 700 have a sound that is characteristically their own: A rather fat, rich quality that one normally associates with good solid-state units of considerably lower power (such as the Citation 12 and the Crown D-60), and the effortless openness that is a sure sign of oodles of reserve power. Both however also have a noticeably fine-grained or 'gray' quality that is substantially less conspicuous in the 400 (which in turn has a shade more of it than the Crown DC-300A). In addition, although it is not easy to overload the 400, it does not respond very gracefully when it is overdriven (usually on heavy, sustained bass passages), and takes a perceptible period of time to recover.
"All in all, we would judge this to be a less successful design than the Dyna Stereo 400 (which sells for $100 more), but would rate it as being the best solid-state amplifier in its price class."
Seems to corroborate Sean's comments, not that we need JGH to corroborate Sean.