Underseat boxes may seem to be a good idea it really is not. Wetness and dirt. An amplified bazooka tube in a 6 or 8 inch would round out the music without the big boom, A ledge built where the rear seatys is a good option.

 

I have two 8”kicker L7T subs under my rear seat. The box they are in is a custom one I made that was supposed to be temporary but I just have not had time to build a better one. My subs fire up into the seat bottom (not ideal for me). I bought the kicker speaker Guards for them. I did have to relocate my Jack. I found that I didn’t lose any storage space as under the rear seat sucks for storage anyway as the seat does not fold up. I have two teens (well one is 12) and so far have not had any problems with them hopping up and down on the seat. The box is a bit smaller than I wanted but it does provide the minimum air space per sub. The next box will be bigger and will contour to the floor better and use every inch of space under the seat and will be down firing. This box allows the rear seat to sit in the stock location. No seat spacers to raise it up.

 

I have two 8”kicker L7T subs

depending on how much power you have driving those, that could be a real nice, loud set up.
id love to see it in action

 

Nice

 

I have one 12 inch that I just put in one of the seats and take it out if I need the space

 

That's pretty much how I'm running now. I have a 10 inch that's sitting on the floor. But I like the idea of being able to use the sub and all of my seats at the same time lol.

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I have two 8”kicker L7T subs under my rear seat. The box they are in is a custom one I made that was supposed to be temporary but I just have not had time to build a better one. My subs fire up into the seat bottom (not ideal for me). I bought the kicker speaker Guards for them. I did have to relocate my Jack. I found that I didn’t lose any storage space as under the rear seat sucks for storage anyway as the seat does not fold up. I have two teens (well one is 12) and so far have not had any problems with them hopping up and down on the seat. The box is a bit smaller than I wanted but it does provide the minimum air space per sub. The next box will be bigger and will contour to the floor better and use every inch of space under the seat and will be down firing. This box allows the rear seat to sit in the stock location. No seat spacers to raise it up.

I like your idea a lot. I hadn't thought about using dual 8's. I think I'll go that route and build my own box when I'm home from school next.

 

I am working on one today actually. Spent a little time getting it laid out, but Im using a Skar SVR-10. Removed the cup holder from the center of the back seat and removed its mounting bracket so I can slide the box back into the seat. Since its a 10, i didnt want the box interfering with the front seats reclining. My only concern is whether the small gap separating the sub from the air space under the seat will be enough. We will see i guess lol.

 

Doing it your way does open your options for subwoofers. The under seat box really limits your choices.