the only reason people would claim "dirty power", is simply that the THD is probly relativly higher on this amp at full tilt than other higher quality brand amps at full tilt. With subs you can get upwards to 10% THD before its noticable (thats also install and driver depandant). im sure if you arent pushing an amp to its limits, itll perform more efficently and probly have a lower THD than it would at full tilt.
as for bumpin focus here, if you set your gains right around 1600w, youll have an ampley powered Q, and an amp that isnt working itself into a sweat, probly providing much better sound than if you beat em like red headed step children. get the power akoustic, youll get plenty of power and a little head room. head room is a good thing people