eh, keep something else in mind. 1000W output will only produce 3db louder then 500W. and will easily consume 2000W instead of 1000.

my system with the 480W for subs and 160W for components was able to hit 118DB in my truck. I typically tried to keep it down around 90db on long trips, I do like my hearing. But there were times id almost clip the system playing a good house song.