Fiberglass vs. MDF?

[justanotheruser]

Okay, this may sound like a pretty stupid question. But would making a fiberglass sub enclosure add more or less weight than a typical MDF (Medium Density Fiberboard) sub box?

Yes, I know, the jokes are on me today.

[5drsvm06]

From what I understand, if you can't make a fiberglass only box because the pressure would shatter it. That is what I have been told. At one point i wanted to build a pimp @$$ rockford fosgate custom box out of fiberglass. I was told that it would have to be made out of wood first then padding then fiberglass.

[aveosummit]

Well actually you can make a 98% fiberglass enclosure if you use mdf rings for your subs with adequate support via dowel rods.

[aveosummit]

justanotheruser said:

Okay, this may sound like a pretty stupid question. But would making a fiberglass sub enclosure add more or less weight than a typical MDF (Medium Density Fiberboard) sub box?

Yes, I know, the jokes are on me today.

Well actually as far as the weight goes it depends on what is being constructed(size/shape) and purpose, so I will answer your question with it depends...

[justanotheruser]

Woo, it depends, very informative!! In all seriousness though, I appreciate the responses. The fiberglass enclosure I want to make would be roughly the same size as the one I have now. The only difference would be that I want to add a little onto the sides to mount a pair of 6x9's and an amp on the top or front.

I'm just really new to fiberglass and wanted to make sure I wasn't adding a bunch of weight to the back.

[aveosummit]

The reason, I say that it depends is because/size and shape can make a difference...

[aveosummit]

Give me the dimensions of what you have in mind and I might be able to help you out, with some pointers

[justanotheruser]

I'll make up some simple schematics tonight on PSP and I'll let ya know. By the way, I know ya were just tryin to help. I didn't mean anything by saying that it wasn't informative.

[aveosummit]

NO problemo, it is what it is, I built a temporary IB Box myself, I think I will cover in vinyl. I will do a fiberglass one once my money gets straight again

[justanotheruser]

Okay, so apparently my drawing skills are not what they used to be. But, the rough dimensions will be l x w x h (in inches) 13x30x11 for the subs. I haven't finished a design, so let's just go with that for now.

[aveosummit]

justanotheruser said:

Okay, so apparently my drawing skills are not what they used to be. But, the rough dimensions will be l x w x h (in inches) 13x30x11 for the subs. I haven't finished a design, so let's just go with that for now.

So you want a sealed box with 6x9 at the top or one on each side? Your amp(what kind is it)?

[justanotheruser]

Well... I'm thinking of mounting the subs horizontally and extending the box up a little to mount the 6x9's slightly sunk into the box on each side and the amp flush-mounted in between them on top. It's an... Infinity 311A.

[aveosummit]

Check out this tutorial on fiberglassing it should be helpful
web.njit.edu/~cas1383/proj/main/