Looking at the down firing under rear seat enclosures for dual subs. All I've seen are solid rectangular boxes.

Question is about the sorta in the middle seat support. Guess ya toss it?
Does it just unbolt?

 

These guys should be able to answer your Q's, they sell these boxes and have an email address and phone number for support questions:
http://www.supercrewsound.com/

 

I've seen some enclosures that require removing that middle bracket. The enclosure will act a the support for the seat. I've seen some that have a cut out so the bracket doesn't have to be changed. It's easy to remove. On my truck, two bolts hold it to the seat bottom, and two hold it to the floor. Whatever you do, the seat must have some kind of support there if anyone is going to sit on the seat.

I'm in the process of redoing my system. I've already finished 2 SEPARATE boxes, one for each side under the rear seat of my '97 Supercab. They are 1/2 cubic foot each with sub installed. I'm raising my seat 2 1/2" so I could make the boxes taller and not so wide, and that allows enough room for an amp rack in the middle. All seat brackets will be in place, and seat will be functional. Lifting the seat also gets you more room directly under the seat back location. There's a "ledge" there where I've installed passive crossovers, fused distribution blocks, relays, etc. I'm going to use conduit and run my power and ground cables UNDER the cab and up through the back end here in this area as well. Ground will be directly to the battery, not to the seat bolts, floor, or some such thing. I'm waiting on 3 new Zed Audio amps that will be a perfect fit for this area under the middle of my seats. Two 2 channels amps and 1 mono sub amp. The 3 chassis are identical and will look super nice in a rack. I'm designing the amp rack from an idea I got from

http://www.bcae1.com.

It will have cooling fans for each amp, and will include the baffles shown to reduce the noise from the fans. The subs are 10" DVC 4 ohm that will be run in 1 ohm configuration to the mono amp. The two 2 channels will be biamping my components. I will also be "hiding" an "old school" amp to run two midbass Audax 6 1/2" in the rear doors. They will only be running 100hz(give or take) to 400hz(give or take) for true mid bass. I may just low pass them below 400(or so), and let them roll off on the bottom end. These are supposed to be a good design for using in an enclosure like the door will present. We'll see. May be a mistake. I'm sure there will be much time spent tweeking to get the crossover points where they need to be. I've considered many different set up configurations and plans in the last couple of years. I finally just pulled the trigger on this. I'm feeling good about it, and better as I am finishing parts of the installation. I've considered probably every possible system set up in this particular truck. Like I said, I feel good about this. Mainly because I'm not compromising anything to "make something fit". I'm putting in the gear I want.


Just some thoughts of mine as to what I've come up with.