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Discussion Starter · #1 · (Edited)
I ‘d been looking around for a modest Sub box that would fit in my 2010 Ram 1500. I’ve seen many dual Sub boxes that go under the rear seats with 10’s or 12’s but did not readily find one to house just one subwoofer AND I really wanted to keep the cargo floor option in my truck. (Great for picking up a pizza and not getting it all over your seats)

So I set out to build my own Sub enclosure utilizing the rear driver’s side under seat storage area and spec’d it out for an 8” sub. The reason I felt I had to go with an 8” vs. 10” was that I would be mounting this below the folded cargo floor and therefore the sub’s outer frame diameter had to fit within the confines of the storage well. A 10” sub would have a 10.75 or 11” outside diameter and that was just not going to fit.

I grabbed one of these:
http://www.crutchfield.com/p_20610C84/Kicker-10C84.html?tp=111
and a Kenwood 150 watt bridged amp to provide the push.

I’ll tell you that I did not concern myself with the enclosure volume or port size/shape (yes my design actually has a port). I’ll also tell you that I must have gotten extremely lucky because this design and the components sound fantastic. It will not rattle your neighbor’s china in their cabinets from across the street but this little 8” will make you feel it in the cab. It’s got great response, tight clean bass with little or no boominess. On some tracks it feels like your riding on an airplane with that annoying kid behind you kicking the hell out of your seat!

I’ll just highlight the sub install here as I’m sure there are many different ways to wire and locate an amp in this truck. Here though is the finished product. I’ll try to post a pdf of the paper template I made if anyone is interested in this design. And I haven’t checked yet but the pattern may be able to be reversed to fit the other side to add a second 8” and STILL retain your cargo floor.
 

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Discussion Starter · #2 ·
I chose some ½” MDF I had lying around and made up a cardboard template of the storage area. Again my goal here was to top mount the woofer and have it not stick up to a point that it would hit the underside of the cargo floor.
 

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Discussion Starter · #3 ·
I made up some L brackets and located 3 of them under the lip of the front edge of the storage area sheet metal (using ½” MDF I set the horizontal portion of the bracket 7/8” below the top of the sheet metal)
 

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Discussion Starter · #4 ·
Once the brackets were secured with screws, lock washers and nuts, I cut slits in the carpet to fit over the brackets and replaced the carpeting on the outside and inside of the storage area.
 

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Discussion Starter · #5 · (Edited)
Then I carpeted the MDF and installed the woofer and mounted it in the top of the storages area. The front of the MDF panel is supported by the three brackets with screws into nut clips. The rear of the MDF panel is screwed through the carpeting and floor sheet metal with two screws. This makes for a very solid mounting.
I mentioned that this design has a “port” and it’s located near the center of the rear seats (see the arrow). There's a gap between the bottom of the MDF and the storage area floor near the center section. It’s pretty functional and a ton of air moves through there. Like I said it may just be dumb luck but the tuning of this enclosure seems spot on.
 

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Nice job. It really looks great. I would love a new sub but I dont want to loose the cargo platform either. Although I dont trust my pizza to it anyways. I make the wife hang on to it. :)
 

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When the sub hits do u feel air excaping around all the edges? If not how did u get a good seal to make it fiction like a sealed box with a port?
 

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i have a question sorry for bumping the thread but did you leave the whole bottom open? you just made that top face to put the sub in?
 

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This sub is running IB, guys. That means infinite baffle. A lot of installs utilize this technique. It requires a sub that has a relatively stiff suspension to keep the sub aligned without the aid of the air cushion a box would provide. Generally though an IB setup has a very large area of air behind the cone...

This box might work better with a fiberglass bottom but I thank the OP for the concept! I think I'll try to build a box in this fashion myself...
 

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Infinite baffle still requires the airspace in front of the woofer and the airspace behind it to be separated so they don't cancel.
 

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Man, you should have went ahead and used glass with all that work.
 

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Man, you should have went ahead and used glass with all that work.
Really wasn't that much work at all. Took about 2 hours total. I use this truck everyday for work and didn't want that glass smell that seems to last for weeks. I also dont think I would have benefitted from glass at all.
I am very happy with the results, box sounds perfect after I put some scrap carpet in it. It was a little large for my taste, wanted tighter bass.
 

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Nice work... I like it ... U like me a self innovator.......lol.... Worst case scenario is you can stuff ha opening with a sealer or rag or dynamatt .... Make it completely sealed... Hell... I getting some big cardboard and drawing out he shape... Then I'll get some mdf....
 
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