I just had an Idea build a "box" in the spare Wheel dip or what ever it is. what do you guys think. how would it sound.

 

I've heard of other people using that area in that maner with good results. Although I have not seen it in a Monte. When you build it let us know how it sounds.

TVW

 

Well that is also the ideaI am throwing around. I would love to find somebody that has tried it and their outcome.

 

The Subwoofer DIYPage v1.1 - Projects
Afiberglass spare tire well car subwoofer
last updated: 27 January 2007



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Faffing around with the JBL 1200GTi
The 1200GTi is one of JBL's better 12" car subs, though there are some caveats. For one, the T/S parameters provided wth my 1200GTi subs were not entirely accurate. JBL quoted the Qts figure as 0.47, and it actually seems to be around 0.42. This has a significant effect on enclosure calculations, and serves as a good example of why it's so important to have the T/S parameters measured for a particular sub before you commit to a particular design. The 1200GTi has an Xmax of 0.31" and an RMS power rating of 600W(!).
These are views of the JBL 1200GTi from the front and the rear. You'd notice that there's a very close similarity between the 1200GTi and JBL's professional audio subs.



JBL 1200GTi - front view
JBL 1200GTi - rear view



The MEASURED T/S parameters for my two 1200GTi subs averaged as follows:



Vas
=
2.4 cu.ft.

Fs
=
30 Hz

Qms
=
5.77

Qes
=
0.45

Qts
=
0.42

Out with the spare tire!
One of the problems that I've had with my car subs in the past is that they're always in the way when it's time to change a tire. Two 2 cu.ft. enclosures holding JBL 1200GTi subs are pretty heavy, and I continually had visions of getting a flat-tire late at night somewhere obscure and having to shuffle the boxes to and from the trunk in order to get access to the spare tire.
Then the brainwave hit - why not use the spare tire well as the enclosure and have the spare tire placed on top, or to the side of the speakers? This will allow me to keep my subs, and still have easy access to my spare tire in case of an emergency. The idea seemed reasonable enough - and has been done before.

Fiberglass?
In order to maximize the use of the volume of the well, I opted to use a fiberglass enclosure instead of building a box that fit within the well. A wooden enclosure that snugly fit in the well would be a bit difficult to build because of all the curves, and precious volume would be lost in the process.
Problem was, I didn't have any experience with fiberglass...
So, I searched around the 'net to see if anyone else had tried this and published their techniques. I came across two pages where the author mentioned the use of tinfoil to isolate the resin and fiberglass from the well while creating the enclosure, so I tried that. Chaps, this is NOT such a good idea, as the resulting structure is certainly not very pretty - the creases in the tinfoil transferred themselves to the resin, and some sections of tinfoil got permanently embedded, resulting in a very ugly-looking enclosure.
I posed a question concerning the use of fiberglass to the [

 

[align=center]Here are some examples of finished systems that I have installed:[/align][align=center]Click below link[/align][align=center][:-][/align][align=center]http://www.carinstallations.com/CustomStereo.html[/align][align=center][/align][align=center][align=center]Click below for another site[/align][align=center][:-][/align][align=center]http://www.lalena.com/Audio/Projects/Car/[/align][align=center][/align][align=center]or check the one below[/align][align=center][:-][/align][align=center]http://www.geocities.com/CapeCanaveral/Cockpit/6144/DSM_Home/2G_Sub_Box/2g_sub_box.html[/align][/align]