mdf fiberglass box
Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=62585
Printed Date: April 30, 2024 at 11:24 PM
Topic: mdf fiberglass box
Posted By: fr33w0rld
Subject: mdf fiberglass box
Date Posted: September 12, 2005 at 4:56 PM
i am building a box for my 18" Ma Audio Hard Kore sub. it's a 6.3 cuft vented encloser....it's made from 3/4 MDF..i am ribbing the sides and bottom of the box and then going to use 9 oz fiber glass to re enforce the box so it's 100% air tight and it wont flex...i am planning on making a fiber glass top to the box..is 1 layer of glass going to be strong enough or should i put 2 layers down? or possiblt put some fiber glass then some kevlar then some fiber glass?
Replies:
Posted By: 05honda
Date Posted: September 12, 2005 at 8:34 PM
most people use 7 layers of glass.....if it is strong enough not to flex i would add a layer just incase but it should hold if it doesnt flex
Posted By: fr33w0rld
Date Posted: September 12, 2005 at 11:14 PM
when u say most ppl...how many ounces per yard are they using?cuz i got a pretty thick weave..or does that even matter?i know 7 layers is for strctual support objects..
Posted By: abovestock
Date Posted: September 13, 2005 at 2:11 AM
If you want strcture use 1.5-2 ounce chop strand mat to do your build up in place of a woven cloth. Save the cloth for the last layer of the finished surface to save time on finishing. If you do it like this you will not need to use as many layers, this will save you time and money.
Posted By: realitycheck
Date Posted: September 13, 2005 at 7:37 AM
Man if you got 9 oz fiberglass I would do two layers and let it dry then do the thumb test and see if it works. If so your good if not lay down some more layers. With fiberglass that thick I think two layers are probably going to do it. ------------- Learning the trade one fiberglass creation at a time!
Posted By: fr33w0rld
Date Posted: September 13, 2005 at 2:07 PM
what i think i am going to do after a lot of reading thru the fourm is get some chicken wire and mock up the top of the box after the inners have been glasses and kinda use that as a frame work to lay the glass on. i could put some ridges in the top to strengthen the top. ------------- HU Alpine CDA-9855 Amp MA Audio 802sx 4,400 RMS 1 ohm Sub 18" MA Audio RMS 5,000 @ 1.5 ohm Ported Box Car 99 civic Si
Posted By: realitycheck
Date Posted: September 13, 2005 at 2:52 PM
I wouldnt use chicken wire, I would stretch some fleece over it and cover the fleece in resin.
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Learning the trade one fiberglass creation at a time!
Posted By: fr33w0rld
Date Posted: September 13, 2005 at 3:53 PM
don't have any fleece i have 9 oz fiber glass mat
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HU Alpine CDA-9855 Amp MA Audio 802sx 4,400 RMS 1 ohm Sub 18" MA Audio RMS 5,000 @ 1.5 ohm Ported Box Car 99 civic Si
Posted By: devil_909
Date Posted: September 13, 2005 at 11:29 PM
What he means is if you have made the box out of mfb then stretch fleece over it and then resin. Then you can add your fiberglass. If you do not have fleece, then you can use any kind of stretchy cloth as long as you add enough fiberglass to make it strong. While chicken wire would work, it is not the best way to do it IMHO. If you have the basic shape done in mfb then it should be no problem to do the fleece part
Posted By: TCalYen
Date Posted: September 14, 2005 at 12:57 AM
devil_909 wrote:
What he means is if you have made the box out of mfb then stretch fleece over it and then resin. Then you can add your fiberglass. If you do not have fleece, then you can use any kind of stretchy cloth as long as you add enough fiberglass to make it strong. While chicken wire would work, it is not the best way to do it IMHO. If you have the basic shape done in mfb then it should be no problem to do the fleece part
x2... I know you'll be kicking yourself when your trying to get a flat, level surface when finishing if you use chicken wire. ------------- TCalYen
Posted By: abovestock
Date Posted: September 14, 2005 at 2:36 AM
how the hell do you think resin will penetrate a piece of 9 ounce glass mat. I have a hard enough time getting it to wet out a piece of 2 ounce. Take everybody's advice also and use fleece to get your shape, and also use some 1 ounce glass mat insted. And also do a ton of reading before embarking on a project, this will save youa ton of money in the long run. Good luck to you.
Posted By: realitycheck
Date Posted: September 14, 2005 at 9:13 AM
Hey Freeworld,
Seriously man were just trying to help you out. If you take chicken wire and try to make your shape with it. Its more than likely not going to turn out right. The chicken wire is just not going to shape like cloth will. You can even use an old t-shirt if its big enough to cover your entire structure. If you can post some pics of your project we could help you alot more. You have any questions about this check out this website. https://chris.pfharlock.com/glass/index.htm ------------- Learning the trade one fiberglass creation at a time!
Posted By: fr33w0rld
Date Posted: September 14, 2005 at 9:43 AM
ok..i'll take some pictures tonite after work...the box is still a work in progress...and i only want this done right....
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HU Alpine CDA-9855 Amp MA Audio 802sx 4,400 RMS 1 ohm Sub 18" MA Audio RMS 5,000 @ 1.5 ohm Ported Box Car 99 civic Si
Posted By: Cougar.Modder
Date Posted: September 14, 2005 at 12:29 PM
Can't wait to see the pics of this monster box. 18" Sub. WOW!!! Sounds like your a perfectionists and at least you came to the right spot to get all the right advice. Good luck and looking forward to some pics.
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Alpine 7830 HU-4X100 W McIntosh -2X110 W McIntosh-MB Quart Q's Mid Tweets-4X10" Phoenix Gold Subs-Phoenix Gold EQ215ix-AC Epi-PG Line Driver-Phoenix Gold 1 Farad Cap -Clifford Avantguard 4-2 Ear Plugs
Posted By: fr33w0rld
Date Posted: September 14, 2005 at 4:52 PM
yea realitycheck i know u guys are trying to help and i thank you all for all your advice...but money is a lil bit of an issue currently and if i don't have to spend the money i wont...but i will be going with the fleece top and i figured out..that i will be molding the amp into the top of the box...and i will be putting glass on top of the fleece for added strength...i will post some pics later tonite so u can all uhh i dunno..check it out or laugh...or just think y do i need so much bass....
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HU Alpine CDA-9855 Amp MA Audio 802sx 4,400 RMS 1 ohm Sub 18" MA Audio RMS 5,000 @ 1.5 ohm Ported Box Car 99 civic Si
Posted By: fr33w0rld
Date Posted: September 14, 2005 at 6:38 PM
https://tvseries.dyndns.tv/maaudio.htm my sub box progress ------------- HU Alpine CDA-9855 Amp MA Audio 802sx 4,400 RMS 1 ohm Sub 18" MA Audio RMS 5,000 @ 1.5 ohm Ported Box Car 99 civic Si
Posted By: 05honda
Date Posted: September 14, 2005 at 8:15 PM
Nice......looks like a good start.
Posted By: fr33w0rld
Date Posted: September 15, 2005 at 12:08 AM
yea it's coming along..i know i got some gaps in the box but i'll get to doing those b 4 the glassin starts...box has to be built inside of the car or i'd never get in the car...adds a lil diffculty
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HU Alpine CDA-9855 Amp MA Audio 802sx 4,400 RMS 1 ohm Sub 18" MA Audio RMS 5,000 @ 1.5 ohm Ported Box Car 99 civic Si
Posted By: fr33w0rld
Date Posted: September 25, 2005 at 10:07 PM
ok guys i fiber glassed the inside of my box today and put the fleece on top i am gonna let that dry over nite and buy some more harder....and put about 12 layers of 9 oz fiber glass on the top of the box....i'll have pics after i am done the fg
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HU Alpine CDA-9855 Amp MA Audio 802sx 4,400 RMS 1 ohm Sub 18" MA Audio RMS 5,000 @ 1.5 ohm Ported Box Car 99 civic Si
Posted By: Master Asylum
Date Posted: September 27, 2005 at 12:37 AM
You plan on soaking that 9oz for a little bit and hoping it doesn't dry? Basically by the time you get a tank set enough to be able to do this, you're gonna RACK the resin/hardener up... But meh. GL I guess... Hope you like that sub a hell a lot too, building the box so it can't be taken out would really suck if you don't like the end... And FG is messy, and working in a car is a bit more aggitating. But as I said, GL man.
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1998 Monte Carlo w/
Eclipse CD8454
2xRockford 5.25" Power 2-way T152C
2xRockford 6"x9" Punch 3-way FRC4369
1xMemphis 16-MCH1300 5-channel
2xKicker 12" L5 Solobaric-2 Ohm
Posted By: TCalYen
Date Posted: September 27, 2005 at 4:56 AM
fr33w0rld wrote:
yea it's coming along..i know i got some gaps in the box but i'll get to doing those b 4 the glassin starts...box has to be built inside of the car or i'd never get in the car...adds a lil diffculty
Damn dude... I know that subs heavy... are you planning on supporting the magnet with a piece of mdf... you definitely should. Either that or you should double up on the mdf on the mounting side of the enclosure. ------------- TCalYen
Posted By: fr33w0rld
Date Posted: September 27, 2005 at 8:37 AM
Master Asylum i am having no trouble at all getting the resin to soak into 9 oz fiber glass mat...it just uses alot more resin.. TCalYen i had 2 of the same subs in a seal enclosure with just 3/4 mdf..it was fine..the wouldn't didn't flex at all....i just had a problem with the box walking around the trunk...i just ended up putting carpet under the box and all my rattles went away... ------------- HU Alpine CDA-9855 Amp MA Audio 802sx 4,400 RMS 1 ohm Sub 18" MA Audio RMS 5,000 @ 1.5 ohm Ported Box Car 99 civic Si
Posted By: leehotv
Date Posted: September 29, 2005 at 3:50 PM
realitycheck wrote:
I wouldnt use chicken wire, I would stretch some fleece over it and cover the fleece in resin.
Posted By: fr33w0rld
Date Posted: September 30, 2005 at 12:40 PM
yea i put fleece on resined it and i've got 6 layers of fiber glass on it now....sunday i think i am going to do another 2
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HU Alpine CDA-9855 Amp MA Audio 802sx 4,400 RMS 1 ohm Sub 18" MA Audio RMS 5,000 @ 1.5 ohm Ported Box Car 99 civic Si
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