The first time i bought trunk audio a bought a 1000W kenwood amp and 2 12" 400W kenwood speakers. and when i connected them in series + to - it was ok bass but when i turned it up past 20 volume the music got louder but the bass got quieter. and when i connected them in parallel it was awesome very loud sound and bass but the amp heated up a lot please recommend me a amp and speakers i should get that will be loud and make by trunk bounce lol