can someone design me a box for free?

[bvr_j_0969 10+ year member]

why not use the one over at RE.com?

it is slot port calculator isnt it? last time i checked i could only find a slot port calculator

 

[bvr_j_0969 10+ year member]

would port placement make a big difference? i would like to have the ports on the top of the box but them needing to be 20-21" long that would put them within 1-1 3/4" from the bottom of the box which i think is to close?

so should i place the ports on the sides of the box porting into the cab corners or straight up towards the roof

 

[Big Dee 10+ year member]

That 21" is not counting the flares, that would add at least an inch. That's not enough room to face them up.

 

[bvr_j_0969 10+ year member]

That 21" is not counting the flares, that would add at least an inch. That's not enough room to face them up.

this has caused a problem, because only other place i could place the aero ports are on the sides of the box, porting them into the cab corners which my box is going to be so big that it will cover the whole cab corner opening, so it would be porting into a pretty much sealed area,

question is aero ports into the cab corners or slot port pointing up

 

[j3bus2k3 5,000+ posts]

You need a vent's diameters spacing b/w the opening of the port to the opposing wall. If you cant do that, do a slot that comes out the bottom...

 

[bvr_j_0969 10+ year member]

any pro's/cons from the top of the box and bottom?

 

[j3bus2k3 5,000+ posts]

not really...you may feel the air coming out of the port onto your feet though. I'm going to crunch the numbers for ya for port length...something about dude's measurements don't sit right, probably cause I simply don't trust winISD.

 

[j3bus2k3 5,000+ posts]

I cant tell you what optimal for the RE 8"s but I'll give you .35ft^3/driver since thats what you asked for...something in the .5-.75ft^3 per driver range may be better...

 

[bvr_j_0969 10+ year member]

.35 is compact .5 is optimal but for 6 re 8's it is pushing the limits for airspace in my truck so i can only get 3.4 cubic feet gross box before any displacements

 

[j3bus2k3 5,000+ posts]

uhh...not really...Your max dimensions gave me 4.740ft^3...

 

[bvr_j_0969 10+ year member]

uhh...not really...Your max dimensions gave me 4.740ft^3...

uhhhm that isnt right

http://www.the12volt.com/caraudio/boxcalcs.asp

height 1- 10", height 2 -5", 52" wide, 21" tall

the truck wedge design

 

[j3bus2k3 5,000+ posts]

For 6 RE8's at .5ft^3 each, each 3" port needs to be 20" long. Subtract the 5" that PSP inc requires gives you a 15" long tube. Glue on the flares and you've got your box at 3ft^3 tuned at 30hz...

 

[j3bus2k3 5,000+ posts]

uhhhm that isnt right http://www.the12volt.com/caraudio/boxcalcs.asp

height 1- 10", height 2 -5", 52" wide, 21" tall

the truck wedge design

Ahh...thickness...I thought you already took that into consideration when you gave them...

 

[bvr_j_0969 10+ year member]

the way i have been trying to tune the box is find out the total cft of it then subtract the displacement of the drivers and then type that in on a port length calculator as cft volume of the box and then figure up the displacement of the port and subtract that from the total gross cft and the driver displacement and see if it leaves me enough airspace the drivers need is that the correct way?

 

[bvr_j_0969 10+ year member]

nope sure didnt i had been relying on the calculators to take that into consideration, im off to work for now