I purchased this product because I had a friend who used a EV2000D and he quite liked it, I also thought that the price:power ratio was very impressive. However the EV4000D just is not powerful at all. After hooking up my new amp, and hearing what my sub can really do, I realized just how little this amp was actually moving my sub. The difference was tremendous! If this amp is making your sub(s) move, chances are they can do a lot better!