When I bought my 2001 Ram 2500 a couple years ago it came with the MTX Thunderform dual 10" powered sub under the rear seat...it had a buit in 200 watt amp and added some decent thump but nothing really spectacular and it would just turn into distortion if it was turned up too loud. I recently sold the Thunderform for $300 and bought an Obcon vented pre fab enclosure on Amazon and put 2 JL Audio 10W0v.2 4 ohm subs(300 rms each) in it powered by a JL XD600.1 amp(600 rms @ 2 ohms) and it was a huge improvement over the 200 watt MTX sealed unit but still didn't hit as hard and low as I wanted. Thoroughly disappointed with all of the other pre fab small sealed down firing enclosure options out there, I began designing my own custom MDF/ Fiberglass ported enclosure approx 2.25 ft3 tuned to 35Hz for a pair of Sundown SA-10s that will be powered by a Hifonics Brutus 1600.1 amp.
Here are some pics of my progress so far:
MTX Thunderform dual 10" 200 watts rms...goodbye!
Obcon w/ JL 10's 600 watts rms(for sale)
New box build
I had to cut out the carpet from the under side of the seat to gain an additional 2" of clearance for the subs and amp. The seat will go down all the way and lock. I probably won't be re using the seat release handles as I didn't make cut outs in the box to accommodate them.
I cut out some carpet for increased mounting depth
1/2" spacer rings were needed to make room for the massive magnets on the Sundown subs.
It sticks out less than an inch past the seat, slightly more on the corners
Feel free to comment or ask questions.