It's a Partsexpress Ultimax UM15:
Dayton Audio UM15-22 15" Ultimax DVC Subwoofer 2 ohms Per CoilDayton Audio UM15-22 15" Ultimax DVC SubwooferExperience the Apex of Subwoofer DesignThe Ultimax Series of dual voice coil subwoofers, from Dayton Audio, are not for the faint of heart. Built using the latest in subwoofer technology...
www.parts-express.com
Decent enough, although I have melted one before when listening "spiritedly" with windows down at highway speeds.
Low bass is about displacement, have to move a lot of air, fortunately a car environment is MUCH easier to get loud low bass.
Fishing the bolt/washer/rubber combo through was a giant pain in the ass. I could do it again making less of a mess. The way I did the whole thing is:
1: Laid both seats down flat.
2: Covered entire rear seat area with painter's tape.
3: Put seats back up.
4: Crawl in trunk, using black magic marker trace outline of seatbacks in trunk.
5: Lay seats down flat.
6: Remove, in one piece, painter's tape transfer of baffle shape.
7: Put painters tape on sheet of plywood.
8: Cut out with jig/circular saw.
9: Position baffle on seats in correct location.
10: Choose few key locations for fasteners/mark on wooden baffle.
11: Drill locating holes through baffle and through seat back.
12: Figure out how to fasten to the seat.
This is the pain in the ass part. As you can see in one of my pics, I cut a slot that was good sized enough that I could get my fingers in there, and using various tools and string, basically pushed AND pulled the fastener over to the hole through the main slot, and used my fingers to align the fastener to hole/compress the seat padding enough to get it oriented right. Patience will help you. There are probably better ways to do it, but I didn't want to have anything poking into the seat back and didn't like the traditional wall anchor fasteners. Once you bolt it up, you may have to double-nut the top of the bolt to stop it from spinning while you torque the actual nut down to hold the baffle in place (or you could use vice grips if you're a savage).
You do need to listen with the arm rest down, otherwise you get turbulence sounds from the ski-pass. I also recommend a steep and lower crossover to stop too much upper bass from dominating.