hi i need some help i had a little sound system in my car then decided to go big so got myself 2x hertz 12" es300 subs, vibe 12v 1.0 digital power cap, 0 gauge wiring kit, cougar 3000 watt amp, made my own box that was sold sealed looks the part . I then wired it all in and it worked but sounded poo! so i run the amp on just one sub and it sounded ok but think it could go better any idea's please more than welcome ????