I installled 2 dvc's in a box I built to 2 cu ft. and I am thoroughly impressed. Unreal lows even at high power levels yet still give great mid sound as well. I've put close to 400wrms of Rockford power to each and haven't given off signs of hating life yet. Underated for sure. Would advise single coils though to get the impedance down w/o needing 1 ohm stable amp. Excellent build quality. Highly recommend these subs.