I just heard a guys 1 10" assassin ported tuned to 32Hz in a hatchback powered by a 400 watt MTX amp and it was SO LOUD and deep. It competes with my 2 12" Arsenals powered by a Crossfire 600D in a regular trunk, sealed. Does that sound about right? Mine is a couple DB's louder but anyone who wants to try assassin (or even arsenal) DEFINATELY get one, they both kick @$$. My setup is hitting in the low 140's according to several local audio places which is pretty good for a non competition vehicle.