I have a Mazda 6 sedan and about eight months ago I started to install my system. I wanted to have a custom sub box made up for my JL10W3v2. Basically, there are useless cavities of space on each side of the trunk. I had a shop mould the back of a sub box using fibreglass to one of the cavities, and they used MDF for the top, bottom, and front of the box. I've come to realize that the shop I used did a **** poor job building the box.......I can hear air escaping all over the place through the carpet and at the speaker terminal area. Also, when the sub is really pounding, the back wall (fibreglass part) actually flexes in and out a bit.

I want to use some sort of sealant/caulking to make it air tight, but I don't know what to use and where to get it. I also want to pick up some polyfill, where can I get it and is that what the correct term is? Lastly, can I brace the inside of the box even though the back wall is not flat at all?

Sorry for the long post. Any/all help is appreciated.

 

I would go back to the shop and DEMAND they fix the "**** poor job" they did.

 

what DannO said

you will have to pull the speaker out and add a couple more layers of glass matt that will help the leaks and the flex

 

I don't want to go anywhere near that shop again....it's owned by an ex-co-worker and although I got a great price, the work was crap. I have since re-done the entire install to my satisfaction. Please don't ask who the shop was either, cause one of the owners is a member of this board.

I live in a condo so doing more glass is going to be very difficult.....is there any way to fix the problem without addimg more glass?

Thanks guys.

 

Not really, first paint the inside with a layer of resin, let it dry. Add another layer or two of glass on the inside of the box. This should seal it up nice and good for you. If the wall is flexing it needs strength, nothing else will add this for you.

 

sorry to hear that...but..the obvious answer is MORE GLASS=MORE STRENGTH
open a window in a room... clear room of contents.. lay plastic on floor to keep from getting damaged incase you drip resin... and go nuts and fix it up

 

Wow, thanks for the info....I'll give it a shot and let you know how it turns out.

 

you should also cut some pieces of wood for braces on long flat runs and glass them