i’ve got 4 of these running in a home made box off a kicker ZX1500.1, in a ford explorer with no sound dampening and it sounds pretty good. i’d recommend this product for basic setups, only because i kind of doubt that these aluminum coils could actually take 900 WRMS. i’ve got them running at about 250WRMS (each) right now, and i can get the coils pretty warm.