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Allright. A friend has asked me to build him a box and he will supply everything. His box needs to fit behind the seat of a 1993 regular cab GMC Sierra. He has no middle consol and it is a bench seat. He wants the box to house 3 JL 10" w6ae subs. I am having trouble making a design that will give them the right airspace and not let them hit into his seat. Any help is apreciated. I am willing to pay for some plans as long as it isnt to exspensive. Thanks in advance.

Have you took the maxium demensions yet? If you have post them up and I'm sure somebody can help you.

Think Justin still does the plans for like $25 :)

Basstronics wrote:Think Justin still does the plans for like $25 :)

urg, scratch what i said before.

programs like winisd might help you, i dont know... i think they're for more advanced users...

btw, have you considered firing the subs up instead of into the seat?

i have a 88 chevy standard cab with bench seat and really there aint much back there if you still want to be comfortable. but i was into the truck scene in the late 80's early 90's and one trick we used was to use a grill over the subs and what happened is that the seat back has enough give in it to allow the grill to push against the material and still allow the speaker to play.

oh yeah, forgot he has a regular cab... whoops.

He is an extremly short feller and so he has about 8 inches at the bottom and about 5 1/2" at the top. He has 60" across the back of his cab if that helps.

well just to give you a rough idea if you built the box 8" at the bottom and 5 1/2" at the top and 60" across with a height of 14" you would have a total internal volume of 2.48....undivided if you seperate the chambers, for every .75" thick divider you add between the subs you will need to subtract .334 from the internal volume....not sure what those subs need but it sounds like a pair of 12's versus 3 10's might be a better bet if the depth works.....

He had allready baught the subs for use in a suzuki sidekick but now has the truck. he isnt going to devide the box up he wants it open inside. I figured out how were going to build it with the calculator on http://www.bcae1.com so i think im finished. He wants to use polyfill, should he or is it a waste of time. A big SPL guy around here told him to spray the inside of his box with rubberized undercoating, is that a good idea? Also, is this box going to need braceing on the inside as far as support? I will be using 3/4" MDF, liquid nail and fiberglass on the inside of his box. Thanks

rubberized undercoating i have never used. it might be worthwile to coat it with fiberglass resin on the inside but as far as polyfill some might argue its worth but i think it just takes up space inside the box and does nothing one way or the other