I don't know about all the - stuff said about the BAMF. I own 1 and my good friend owns one and it has gobs of power for my 2 DB Drives PLW's. Gets mad loud and does it without heating up too bad and i o my friend haven't had any issues with them yet. I give the 5500/d 2 thumbs up from experience. That's just me though. I have never had any good luck with my 2 hifoniks amps i owned in my life, they were back in the 90's and blew them both. I am 35 and have had alot of different stereo set ups, DD,RF,MTX,Jensen, Eclipse,Alpine,Kenwood,etc. etc. and so far this amp to me is the best bang for the buck. I wish i had a way to test it, but i don't.