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.
Thats cool chris, im going to be running 2 Arsenal 12's sealed once i get them. Seems like your underpowering your arsenal's and your still hitting hard and clean. Thats a good sign because once you upgrade to a bigger amp, you will notice it right away.
Tell me more about how it sounds and what car its in etc... Do you have any pics ?
Im using a Arc Audio 1500-XXK / 900 x 1 @ 4 ohm so like 450 rms to each. Should get loud enough for my tastes.