Depends on a lot of factors: box size, the options you choose, your listening levels. Anywhere from 2000-3000rms but too many factors to tell with the lack of information you gave us. 4ft cubed at 33 hz with cooling only. what do you mean by listening levels He means how loud your volume is, do you listen to your system at full tilt a lot and the like. as of now since im using my stock stereo i have it cranked high with my bass turned down i use the bass knob to adjust the bass but usually its sitting at like 3/4 full volume