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Discussion Starter · #1 ·
So... i feel like a complete dumbass... I made sure the RF 10" Subs fit by the depth dimensions, but I didnt even think about the top mount frame dimensions.

The new subs dont fin into the MTX Thunderform enclosure.
The frame is about 1/2 inch larger than the frame of the old MTX Subs.


here the sub sits in the enclosure, but will not fit because the frame is larger than the enclosure will allow.



Here is the MTX on top of the RF sub.


Im not sure if I want to sell these subs locally, (1 still never opened, and 1 was opened, but put right back into packaging), or if I want to replace the MTX enclosure with something else.

I dont like the foxbox and probox enclosures, you have to raise the back seat with both of these enclosures, and still get less internal volume than with the MTX enclosure and I dont have the rear seat raised at all.

Anyone know how hard it would be to modify the enclosure, and form a new top and new Sub mounting hole?
 

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It wouldn't be too hard to modify the box based on the picture you posted. An air saw, or cut off wheel, can be used to enlarge the hole and give clearance where that hump is towards the back of the speaker location. Then once the sub is fitted, use fiberglass mat and resin to re-seal up the box and smooth it out. Not really hard to make it work, but might take some effort to make it look good.
 

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Discussion Starter · #3 ·
I would love to do this, as I dont want to get rid of my enclosure. I cant however seem to find any help online that shows this type of repair with fiberglass on a surface like this. The box is a MTX Thunderform enclosure. Its made of plastic, and the top looks to be maybe 1/4" thick or less.
cutting I can see would be easy, im just worried about the sealing up part.
 

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If you haven't worked with fiberglass before search youtube for some how-to help. If it was me, I would cut out as little as possible to get the clearance. Cover the woofer in painters tape and test fit it while you are applying the fiberglass mat and resin. That way you can make any adjustments to how the fiberglass is going to take shape. Layers or resin and some silicone caulk, if needed, will seal it up.
 

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Discussion Starter · #5 ·
Wish u were closer or i knew someone from my area with exp... I could really use it..
Thanks, and I will let u know what I am able to do.
 

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Discussion Starter · #6 ·
How hard would it be to use my Mtx box as a mold for creating a new fiberglass box? Lay fiberglass and resin on the bottom of box. Let the shell harden and separate. Then add more layers to inside the shell to give strength and thickness to about 1/4".
Then use a. 3/4" top and seal the two pieces with epoxy maybe? Not sure how to join the top half and bottom half together? I understand if I build a wood frame and then lay the fiberglass on-the-job frame then I would just screw the top to the frame. Here I will just have a fiberglass shell. Maybe screw the shell to the top? Like foxbox...
any advice? Or is this a dumb idea destined to fail?
I want to get materials tomorrow morning and start.
 

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You have the basics down, but you would not want to make your mold from the box you have because it would be larger than the MTX box when completed and might not fit. If you make a mold from that MTX box it will be slightly larger than the form of the truck body. You want to make your mold from the truck itself so that it fits perfectly. You can remove all the carpet, tape off the area and begin to fiberglass or use the carpet as you base and fiberglass/resin to that. Either way you are building your box to fit the truck, not making it from another enclosure. Aside from that detail, all of your other assumptions are correct. Once you have the base glassed, you can lay a MDF sheet on the top and glass it together. This makes your box, how detailed you want it to look is up to you with the finishing details.
 

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How hard would it be to use my Mtx box as a mold for creating a new fiberglass box? Lay fiberglass and resin on the bottom of box. Let the shell harden and separate. Then add more layers to inside the shell to give strength and thickness to about 1/4".
Then use a. 3/4" top and seal the two pieces with epoxy maybe? Not sure how to join the top half and bottom half together? I understand if I build a wood frame and then lay the fiberglass on-the-job frame then I would just screw the top to the frame. Here I will just have a fiberglass shell. Maybe screw the shell to the top? Like foxbox...
any advice? Or is this a dumb idea destined to fail?
I want to get materials tomorrow morning and start.

Why not just fiberglass over the top of the box to include the hole with about 6 layers and then recut the opening a little further back? Seems like the easiest to me
 
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