subwoofer fiberglass install help

[fastfreddygassit]

PM meanmx. He IS the dude for this stuff...and he is in Melb...

[Alex]

I had a writeup of mine on here somewhere, might be worth looking up, it had alot of pictures. It was ported but I don't think I would bother porting again.
I had no trouble with rattles either just think about how your are going to anchor it to stop it rolling around.

Edit: Found it Here

[marcusus]

Let us know how you go with it. I'm looking to (eventually) do this to my 12" as I'm in the same predicament as you.

[Alex]

Hmm, in reference to sound quality I would choose a sealed enclosure.
While porting will allow you to tune the sub a bit better I found that due to restricted volume (of enclosure) my port had to be small so although it was tuned it was still too narrow, so at high volumes it would have some problems allowing enough pressure release which degraded quality.

Also with a sealed enclosure you don't need to worry as much about volume since it's sealed anyway, unlike ported where you will need to calculate the port length based on the volume of enclosure, diameter of port, tuning frequency/range and the shape of the port ends.

Make sure you use enough fibreglass, they are known to be too flimsy. There is a rule of thumb when making one, if you can make it deflect by pushing with your thumb then you need more layers.

Other than that it's fine, you will still need to use some MDF to make the mounting ring for the sub, and I would recommend getting some proper anchoring threads as well to make sure the sub is secure.

[Alex]

I don't think a 12 will fit standing vertical but it wouldn't be hard to measure.
The problem with filling up the "well" is getting the enclosure in and out of the car.

[meanmx]

There are a few things you need to know regarding your planned enclosure. You need probably need about 25L for a sealed enclosure and optimally about 50L for ported. As you know the Mx boot is quite small. Ported is probably better depending if you tune it properly and you give it adequate space. First you need to think how much of your room that you can take up with it. I put mine right up the front of the boot to try and maximise my boot and pretty much used every available bit of space that I had available via fiberglassing. Someone mentioned that if you can deflect it with your thumb it is too thin. That is wayyyyyy too thin, you need to be able to stand on it for it to be thick enough to put up with the rigours of a 12". I would personally make it removable as well as you never know when you might have to take it out for the extra space but that's just me. As far as the boot rattling you really need to sound deaden the whole boot including behind the number plate or you will always have that rattling. Hopefully this helps you a bit. Incidently I don't think you can stand a 12" upright, you will probably have to lean it over a bit. Good luck.

Ben

[marcusus]

what kind of problems do you have?

No problems besides lack of boot space. I haven't gone nutso with all this tuning business. Just wanted the bass to fill out the frequency range, especially considering the type of music I'm in to. The head unit controls is enough tuning for me.

As for whether or not a 12" will stand upright in the boot, I think you'll find it won't. Give it a crack, but my money's on it not fitting straight up. You'll need to go slanted to get it to fit.

[marcusus]

I'll admit that the sound projection isn't great in mine either, but for what I hear in the cabin it does the job. I'm not about overpowering bass. I'm all about a good frequency spread.