I got hold of a fiberglass tub for my wheel well.
The internal volume is 3.25 Cu.Ft. I want to get the volume down to 2.5. What is the best way?. I have limited access to the inside as there is a mdf top and only a 12" hole

 

fill it with water or sand

 

Water, sloshing around in his box while he drives?
That paints a funny picture!!
Is wieght an issue? If not, some kind of concrete (not likely!).Otherwise, go to home depot and see if they have some kind of pourable putty that's lightweight. 1 fluid liter = 0.0353146667 cubic feet
Sand would work too, but very heavy...
I have heard of people use phone books to displace volume, each one is .15ish, but that's just ghetto!

[ August 05, 2004, 06:59 PM: Message edited by: Nissan Guy ]

 

just kidding you could use the marine exspanding foam
or make a box that displaces the area needed inside your box

 

If you use expanding foam, youi will have no idea whatthe final displacement is. . .

 

ive always wondered this, but, tried every glue at work , all mealted the foam. what glue works for styrofoam?

 

THE BEST WAY TO DO IT WOULD BE TO PUT DOWN A COUPLE LAYERS OF MDF THEN FIBRE GLASS AND SCREW IT DOWN THIS WILL ALLOW YOU TO TAKE A GOOD VOLUME MEASURMENT..

 

As he already knows the volume, use the styrofoam blocks, they attach very easy and if they come loose then they will not destroy the backside of a woofer like a chunk of mdf can. They are also quite a bit lighter if weight is a concern. It is an easy thing to do. You can probably resin them into place as well.

I've used a shoebox that was sealed up real good with ducttape and resin before as well. Worked just fine. A little ghetto but we were in a pinch and it's what the customer wanted. Sub box - by Nike.

[ August 05, 2004, 07:46 PM: Message edited by: MR2NR ]