I have 3 12 pioneer champ series subs in a ported box,with a 4000d power aucoustic monoblock amp its pretty loud and clean bass.im trying to get 200 for the amp and 200 for the subs with the box..the amp is well worth 200 bucks i never had a problem with any of this stuff..you can call or txt me at 804-397-7538 i dont use the computer too much.