the PS200 is the same as the D150 and the 400 the same as the 300A - the only diff is packaging and the additional chip that allows delay turn-on and display board revisions. Same power transformers, number of outputs, etc etc, Just a much better frame for multi-amp commercial installs. Power specs tend to change with marketing people so take it with a grain of salt.
The PL3+4 are versions with more blinky lights ( oh yeah - we NEED them )..
if any of you guys are looking for some serious sub action, I have a large number of the 2KW mono block amps of different vintages / features.. M600/7560/DO2000/etc... AND I can do a simple rewire of the front panel card slot so the standard PIP cards will work..
I also have some 10KW and 36KW amps.
sub