Subwoofer box mounting recommendations

I have a 2020 access cab, with no rear seats. I pulled the toolboxes, and replaced the floor panel with a 52" Birch board so I have a solid platform for my subwoofer box. The box is a heavy ported beast with a 13w7, so I'm trying to determine the best mounting solution so the box doesn't fly forward if I get is a crash.

I have some ideas, like using internal bolts, but I don't want to mount this heavy sub sideways if I have to bolt down through the box. I'd prefer to use something that allows me to removed the box without pulling the speaker.

I was thinking about d-rings but I'm afraid that the birch isn't strong enough for screws and I don't want to damage the box. I also don't want to have the screws punch though the port, since I can only mount fro the two gable sides.

I'm open to ideas and pictures! Any advice will help me determine which way to go. I should have built the box to incorporate mounting points, but ces't la vie...

 

I would do something involving the seat belt bolt holes, or the car seat latch points. Maybe some eye-bolts going through the box with a washer inside for support, then some turnbuckles to tighten the box down to these points

 

How is the birch board secured to the truck? I need pics.

 

Thanks for the advice Destin. My problem is the port on the side, and using eyebolts would breach I to the port flair. I probably should take so pics. I'm fabricating the board right now, and I think I'm leaning towards just using a nice L bracket set and some 5/8s wood screws (so I don't perforate the 3/4s Birch all the way). I'll take pics before I make any moves, though

 

I'm cutting and forming the pine board right now, then I'll take pics of it all. I'll get them up here shortly

 

Ok, here's my mounting solution for the access cab.

Basically, I kinda molded a 3/4" x 9-1/4" x 6 long pine board by making small cutting adjustments and jigsawing along the way. There's a rounded inlet in the middle of the cab you have to router or jigsaw out of the board, which makes it a bit of a pain in the ass. Also, there's some huge lugs in the back that are hidden by the carpet, so you'll need some spacers (I used rubber automotive grommets) in order to raise the board above those lugs, otherwise your box will hit them and lean forward.

To mount the board, I just drilled holes in the board in alignment with the existing cab holes for the factory snap-in toolbox clips, and I used

$27 Small Parts 138332003 Steel Tapped-Hole U-Style Clip-On Nut, Plain Finish, 1/4"-20 Thread Size, For 0.025"-0.15" Material Thickness, 0.531" Edge Distance (Pack of 25)

these over the holes along

$12 1/4-20 x 2 (30 pcs) Flat Countersunk Head Socket Head Cap Screws, 10.9 Grade Alloy Steel, Black Oxide Finish, Allen Hex Socket Drive, Full Thread, Coarse Thread UNC

with these bolts. I needed the board to be raised, but not rigid, so I bought

$10 Energy Suspension - 9.8101G SHOCK TOWER GROMMETS , Black

8 of these as well (not exactly these, but similar). I used 6 screws in the front, and two in the back. For the other 4 holes in the back, I used

$10 Clipsandfasteners Inc 25 Rubber Bumpers - Fits 1/4 Hole

automotive spacers like these to support the board.

That box is heavy as hell, but it's not going anywhere. It's not a miraculous solution, but I hadn't seen any other Access Cab builds with a huge box, so I wanted to post an example for posterity. And it works, so that's nice

Here's some pics. The box is a Marv Box I had built for my 13W7. I wood dyed it and applied shitload of rub-on poly layers. The 13W7 is being ran off of a RD1500/1 @ 3ohm. It's probably getting around 1200W, which is plenty. Any more and I wouldn't be able to hear anything but ringing.

 

Beast mode. That's a gorgeous enclosure!

 

Don't know if you settled on a mount yet, but I wound up doing something like this - just removing the rear bits & bolting plywood to the inserts on the wall (1st gen, but you probably have similar options). The plywood does a great job of blocking noise too.

 

Thanks for the compliment! and ooohhhhh... I like what you did there a lot. My 2020 has a stupid wave pattern on the back wall, but I might try to copy you here somehow. That is straight awesome, and I could mount the amp on there!

Damnit dude, I just got done! Now I have to rip everything back out again!