View Full Version : Fiberglass Sub box??
10-09-02, 10:11 PM
iv made a sub bos inclosure into a cavity i found in teh back of my car, well anyways, the part u cant see is made from MDF and the part u can see is fiber glasses molded shape. i wanna know how think the fiber glass will need to be?? like how many layers would u recomend, there only 8" subs by the way.
iv used this technique to make the face of the sub box, but need it reinforced and wanna know how think to go.
10-09-02, 10:58 PM
11-09-02, 12:51 AM
The box that I'm making now has 5 layers of fibre glass. Depending on the size of each wall you may need the same amount - just as long as it doesn't flex.
11-09-02, 09:09 AM
cool thanx, i thought it would be about that.
just wondering cos some people recons it needs to be like 15mm thick!! bugger that hehehe
11-09-02, 09:53 PM
You could make it that thick - it would be very strong, but over done. If you have the cash to waist - go for it!
the thicker the better. to help you along use small offcuts of mdf etc in between layer of matting to add bulk as well as strength. Some use wire mesh bent to shape to add strength as well.
It should only need to be very thick if it is a large plane, but hopefully you have used as much mdf as possible with only the fibreglass area filling the complex shape that the mdf couldnt.
12-09-02, 12:45 AM
they are only 8" subs :rolleyes: im so over my 15"s im going deaf lol. but yeah, MDF as much as possable on the rear (u cant see) and cut a ring for the sub to mount to, then positioned it up in place on some off cut MDF the streched fiberglass fron the ring down to and around the rear 1/2 of the box, ive done about 3 layers nor and SHIIIT load of reson, and it seems bloody tuff, one area where it treaches a long distanc theres a very small bit of flex but i will fiberglass it abit more.
"to help you along use small offcuts of mdf etc in between layer of matting to add bulk as well as strength. Some use wire mesh bent to shape to add strength as well. "
WHAT?? wouldnt u get big lumps in it them ????
hehe...i mean cut small bits of mdf that contour to the complex shape and hold them in position by apply matting and resin. Up to you really but i prefer some sort of reinforcement in fibreglass that will be constantly vibrated. The wire i suggested would do a similar job except wouldnt add the same mass.
for reninforcing why not use angle ali, you can place it across the inside of your box, face it down and lay up over it, or along the edge and lay up on it, it will give you the strenght to stop the side wall from flexing without having to put to many layers. I have even seen the security mesh resined in place with little more that a tissue paper tie layer to give strenght to a large panel, or try kevlar thicker, takes more resin, but saves having to lay up lots of layers.
id just go with the angle layed up on the inside, bugger all flex.
Powered by vBulletin® Version 4.2.0 Copyright © 2013 vBulletin Solutions, Inc. All rights reserved.