Installed the BOSS D10F Phantom 400rms/800peak 4ohm sub today in Scosche SET10CC 10" wedge box today, powered by older JBL 600.1 amp (like 450rms @ 4ohm).
As far as the sound, it's awesome. I have the gain turned up maybe a hair over 1/4th of the way, bass boost (on amp) almost all the way down, sub level 1 on my pioneer headunit. I tuned it to pick up right around where my midrange woofers in door fall off and then adjusted all that stuff so the midrange woofers don't make their feeble attempt at being bassy anymore.
The truck box does not fit all too well - Hagen, idunno how the hell you did it with the bench seat lever on the passenger side!
I trimmed my bench lever on that side down to just a nub, but should have trimmed more actually. It gave me another click back on the bench and I think I'm riding at the same or one click further forward than I was before. It's still comfortable and clutch is easily accessible and all. It would kinda suck for road trips, but I prefer to get out of the car and stretch instead of riding ghetto and extending my legs (not even possible with bench anyway).
I basically snapped the white U hook thing over on passenger side midway up off clean, I just used gorilla force and worked it back and forth. It was 16 *F outside so that may have helped, but eventually it just popped off. That let the top of the box sit back an extra inch. What's left of the nub for bench fold lever on that side still touches the box, but it almost pins the subwoofer back in the passenger side rear corner pretty damn tight. Since the floor isn't level I shoved a tshirt under there to make it a little tighter still.
I think the sub might touch the back of the bench when it's blasting, but it sounds good and is plenty loud - I even turned it down a lot from where it was and it's still awesome. Gives the whole bench a back massage even when I have the seat forward and am sure woofer isn't touching (can't drive like this though). No rattles in cab at all! Best $60 spent as long as this $33 woofer lasts.