Very good product, i have used them, and get a hold of R/T Pimp he use to be sponsered by them, there products are really good, there the same thing as DB Drive, there 4000D does like 3500-3800wrms, and the 2500d does rated power, the subs are very very underrated there Zen 10s are rated for 500wrms, i gave them 1500wrms daily!! Very good product!