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Discussion Starter #1
Dunno if this is the right forum... but anyone got some real techncial info on how-to fiberglass enclosures??

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I've had 2 fiberglass sub enclosures. The first one cracked right down the center. All it was was a regular box made out of MDF, and fiberglass bondo was smoothed over the top of it. It was a super thin coat, so that's why I think it cracked from all the bass. The second (I still have) is too big to fit in my hatch, so I'm not sure yet what I'm gonna do with it. That one is basically the same design. Wood enclosure, but it has like 4 coats of fiberglass resin and bondo over the top and sides. Also, the interior of the box was sprayed with liquid dynamat.

I don't really know any other ways of making them, besides the way that mine was made. I guess you could make an entire box completely out of fiberglass, but then you would have to cast some kind of mold.

Some of the veteran sound off guys can probably answer your question a little better than I can. <img src=icon_smile_blush.gif border=0 align=middle><img src=icon_smile_sleepy.gif border=0 align=middle>
 

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Discussion Starter #3
I was thinking more along the lines of a built-in type enclosure, like a replacement boot wall or sumthing like that... no one can help??<img src=icon_smile_sad.gif border=0 align=middle>

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you should be able to use plexiglass a little easier and more cost effective... I can't see it being too hard... where do you plan on mounting???

are you racing you mom's car?
 

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Discussion Starter #5
in the far right section of the hatch... there's a perfect space there if you box in flush with the wheel indent...
hehehehe!! have to remake a panel out of fiberglass... then cover it... using (plexiglass??) or the wood thing?

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I cheated once... I needed to make a sub enclosure to fit in the under-floor storage area of an old Ford Fiesta. First I made the sides from 3/4" MDF. Then I covered the trunk floor with cooking foil and used a 4lb tub of glassfiber filler paste to seal to the floor. While it was still wet, I pushed some stainless steel mesh into the filler and stapled it to the inside of the sub box. Then I used two more 4lb tubs of glassfiber filler paste to over the mesh. Once it dried, I had a good solid cabinet that used all available room in the trunk. It sounded good too, with an Infinity 8" sub driven by a bridged Kenwood amp. (This was years ago when most 8" subs still needed 1cu ft to work properly. Now you could get a 10 or 12" sub into the same air space and it would still sound good.)
 

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Discussion Starter #7
thanx, but I don't think I could cheat like that!!<img src=icon_smile_big.gif border=0 align=middle>

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just get yourself some drywall, design it the way you want, then superglue it in place. If it doesnt sound right, take a hammer and smack a couple of holes or 'ports' into it. Maybe if you wanted to fancy it up a little bit, and you were willing to spend a little extra doe, get a 24 pack of crayola crayons and do a little design. <img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


<hr width=60% noshade size=1 align=left>line em up ;)

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woahsharky's got the right idea, i did that to my car and my **** hit really hard. it's like nothing i have ever heard before. it took some time to place the holes in the right spots and make it sound good. it got my little kid's pokeman drawings on it and, let me tell you, i think i have one of the greatest looking boxes all round.


<hr width=60% noshade size=1 align=left>mess with the best die like the rest
 

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http://www.lowridereuroweb.com/archives/tech/0102_tech01.jsp

check that article!! lots of good stuff<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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Discussion Starter #11
thanx dude... that's what I want to do, but on the vertical left body panel... gravity won't be helping me here!!<img src=/images/forums/snitz/smile.gif width=15 height=15 border=0>


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Hella good read! <img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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Discussion Starter #14
<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>
Knocker did you ever complet it? Have any Pics?


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nope... this project will be done this summer. It's going to be hard, but I'm up for it so... I'll post pics as soon as it's done, I'll try to show how I did it too!


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Fiberglass work is trial and error. My whole Tiburon trunk is fiberglass, but it took about a month of screwups to get it perfect. The easiest way to make a shape to fiberglass is with an old tshirt. For instance, you said that you want to make a certail box shape in one of your corners. Build your enclousuer using cardboard or even MDF to get the shape you want and attach it temp. where ever you want it in the corner. Simply stretch some old tshirt over this shape and the rest of the corner...(use the rubber seal on top of the trunk to hold the shirt in place) and attach the bottom with some temporary brads or even strong tape. Now, use lots of resin to soak up the tshirt(don't forget to use alum. foil everywhere you don't want resin, it won't come up once down). Let it dry and remove the whole thing from the trunk. Trim all corners and trim the tshirt fom the top of your prebuilt enclosure. Now resin all the corners of this shape. *Use some fiberglass mat cut in small pieces all over the enclosure* After it dries, you should have a shape closley resembling what you want. It may be necessary to trim everything again and apply a few more layers of glass. When its all dry, then you move on to sanding, sanding, sanding, sanding, and when you get done with that, sand some more. Then use bondo and sand it again. Then use your favorite spray paint, apply a few coats and finish with a clearcoat......I know this sounds confusing...I'll try to post some good sites that show how to work with fiberglass..<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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another easy way to do an enclosure is to add a 2 inch lip all the way around your existing box. Stretch some grill cloth across the whole enclosure. Build some 1/4" or smaller speaker rings and attach to the speaker hole. This should make an even impression in the grill cloth all around the box. Then apply resin, fiberglass, sand it and paint it.<img src=/images/forums/snitz/smile.gif width=15 height=15 border=0>


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Discussion Starter #17
Thanx dude, try to get me some more info if u can. See the thing is I want to reduce the weight of the whole box, so I want to make it all out of glass... not glass over MDF. I'll figure it out I guess... once I have the mold done, it's done! Heheheh, well thanx again!<img src=/images/forums/snitz/smile.gif width=15 height=15 border=0>


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are you trying to go for looks or sound? thats the first thing you need to decide. what size subs are you gonna run? how many? i built my own cutom box in my hatch took out all the back seats spare tire etc.. I mae it out of 3/4" MDF, i was also running 4 12" mtx thunder 8000 subs. if pounding bass is what you are looking for mdf is the way to go if pure LOOKS is your style than fiberglass is the way. all i know is that i hit 145.3 db's at the last contest i was at. that should speak for itself


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Discussion Starter #19
ok what I want is not only looks. but I do plan on racing sumtime so weight of the mdf is an issue. I also like to have some trunk space! so hence the fiberglass... but the thing I am not sure, is if I should be putting all three speakers on the same side. I am currently running an EXCELLENT cerwin-vega 10" sub. (I like the fact that ppl think I have two!!!). Any help would be great.

and frozen... I plan on making the whole thing out of fiberglass... I don't want to make a sealed box covered by MDF. Thanx alot tho for your help!! gotta go!! later!


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Knocker,
You wouldn't have any problem putting all the speakers on one side other than the extra weight on that side, which might affect your racing. It would sound the same regardless where the speakers are placed in the trunk. The only thing that would change the sound is firing the speakers up, backwards, or toward the cab. In your case, I'm not sure what type of project you are looking at completeing so I can't help much with how to fire the subs. I can help on fiberglass however. You said that you wanted to race some day and don't want the weight of MDF, but consider how much glass you may have to use in order to build your box. I have also seen some amature's fiberglass boxes explode during a bass line. On more than one occassion. Makes for a really painful homeade greneade! I'd suggest using some small pieces of MDF just to act as a brace and also to help with molding the glass. Explain your project to me or post some links so I can see what you are planning to build and I'll do my best to help you design what you are looking for!<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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