Malibu_Rapper

Hey guys I was wondering if you can post up some pics of any sub boxes you built for the spare tire. I'm specifically looking for boxes that use up the space on the right hand size.

I want to build a downward firing sub so I can keep it all looking stock without cutting the spare tire cover. The one area of concern is next to the strut tower there is a little bump that I'll have to work around. You can see it in this pic below:



With the space I'm working in it's really tight working around the JBL GTO804 subwoofer that I will use. The box will be ported since I have almost exactly .6 cubic feet. Here's a 3D render of the subwoofer box.

oreoremix42

Ahh yes this is very easy haha



Take the foam peice and trace it. I would cut the little pieces that hold it up and set it down as low as your can so you can make a cover palte. thats my problem right now

Malibu_Rapper

Yeah I was going to keep the box the same height so the coverplate will fit it it just right. I was also going to just glue on some wood tabs in the right places to hold the foam cover up. Good tip on tracing with the foam, I was going to trace with the plastic box.

oreoremix42

No don't keep it the same height. When the subs are mounted in the height will be hard to deal with a cover plate. Like cut the edges off!

phatchef

kinda like this?

Greg S

iTrader: (1)

I would suggest that you do not do a down firing sub there. Not unless you are going to deaden the area extremely well. That is an area of large flat sheet metal that resonates just in normal driving, let alone with a sub firing right in to it. You might be better of firing it and the port up and building a new cover that has a grill built in to it and covered in acoustically transparent trunk liner.

randomsuper

you sure you have enough airspace to port that sub? that's a tiny box and you might be better off running it sealed for sound quality purposes.

Greg S

iTrader: (1)

I thought so too until I looked at the specs. These subs require small boxes! They call for a 0.6 cu. ft. enclosure including sub and port displacement and its tuned to 40 Hz. Sealed it only needs 0.3 cu. ft. Only thing I would recommend is to run a subsonic filter so that you don't over-tax the sub on the lower end.

Malibu_Rapper

yes, the sub requires .6 cubic feet for a ported box. The area of volume is around .67 feet according to the CAD drawing but I'll lose a little space from materials. It's a very highly rated sub by the folks at DIYMobileAudio.

Greg S I think I'm going to take your advice about down-firing. I wanted it to be a simple installation in case there's an interest in mass producing these.

I can get the cost down to about $75-$100/unit for the first 100 but I don't think the demand is there.

Because of that hump near the strut tower, that makes down-firing very close and probably out of the question without a complex design. I don't want to glass anything up and looks like the easiest solution would be upward firing.

Greg S

iTrader: (1)

The GTOs have always been good since they came out, just need some good power put to them. What S/N do you use on DIY? I use the same one as here but haven't posted on there for awhile.

phatchef

its not hard to glass the bottom of the box to mold the floor shape. we did it in mine to make it work with the space we had behind the air tank

xseveredveganx

2010-01-06 23.40.15 by xseveredveganx, on Flickr

Malibu_Rapper

I'm not stranger to fiberglass but I'm getting old and I don't like the smell and the time it takes to do it right. Back in the day I used to like to make everything fit right. Now if I can do it all out of wood it makes it a lot simpler and cheaper. I remember one of my cars with 2 15s and a single glass wall that kept getting blown out. It took about 3 tries to finally get it strong enough. I got the walls built to 1" thick because I was sick of it. At the prices of materials now and cost of my time an endeavor like that might cost me $2k to do it all over.

I'm therealdeal74 on there but I hardly post. It's one of those forums where you have to be really longwinded and I think they do a great job without me already. I see a lot of people experimenting with crazy subwoofers on here and playing via trial and error. Spend 15 minutes searching on that site and you won't have to make any mistakes...

Malibu_Rapper

Well, turns out that the Google Sketchup volume calculator was very inaccurate with the curve. When I straightened out the curve with a larger volume, I got .42 cubic feet so it looks like I'll be staying sealed.

IronScion

Got my xB in the shop right now, getting a jl 13.5 thin sub put in the spare tire area. Pics up soon!

IronScion

Sounds really good, JL 13TW5-3 w/ a sealed enclosure and an Alpine MRP-M1000.

r2d2michael

^^^ nice! how much did that run you?^^^

SamCarroll

Heres my project today.











Sealed the box portion up tonight, will connect the two tomorrow and Tuesday ill put the felt over it and fully install it. Will be so nice to get my cargo space back.

IronScion

I payed a little bit for the install, but I got a really good deal on the sub, and I already had the amp. I usually do my own sound installs, but it was worth it to have it professionally installed.

SamCarroll

What are you all using to adhere the carpet? I used 3M super strength adhesive spray and it didnt work at all. carpet pulled right off this morning.