Soundqubed hdc3 15. .. For anyone looking to upgrade to a sub that has an incredible price tag.and is absolutely an effing brolick beast in the spl and sq category then this sub is for you.i have 2 hdc3 15s in a reinforced atrend bbox with 2 hifonics.brutus.brx 20001.d amps 1 for each sub wired down from 2 to 1 ohm each sub .so they getting 2k each sub 4k total.and these thing POUND#####.i set alarms off everywhere i go.ive shattered my sun roof already. and screws and bots tend to pop up everywhere in my car.mind you yes i do have a mechman h/o alt..big 3 upgrade with a optima yellow top in the trunk.but these subs as long as you give them a minimum of 1500 to 2000 watts or more they will wake the eff up and destroy...soundqubed ftw.