I don't care too much for Memphis subs. They are good subs, I just prefer JL subs. I have a Memphis 1000D amp. Their noise ratio is lower than most amps out there. And their Class D stuff is TRUE Class D. The 1000D is 1 ohm stable. I was pushing (2) 12" JL Audio W6v2 dual VC 4 ohm...thats a 1 ohm load....1100 watts @ 1 ohm RMS and still less noise than the MTX I had before @ 2 ohms...MTX 1100D I think. Very good quality amps...very small houseing...but that's what a Class D amp is.....very efficient. One of the best amps I've ever owned. RIght up there with PPI in my opinion. I've owned everything from MTX, Fosgate, and PPI to JL, Pheonix Gold, and Autotek (old school autotek).