an 800w to a 1000w amp would do the job, im runnin 2 12" subs which are 800 w each and they sound fantastic. i got a sony explode 1000w amp for around £200. get a good wiring kit, spend about 30 to 50 quid on them cause they make all the difference and run your power cable down one side of the car and the resr down the other to avoid distortion. hope this helps.