Box modifications/recomendations

[Max-x]

Hello all! This is my first box design and im building it for my advanced woodshop class at school and im looking for some info to help it hit loudest:

It is designed to use 2 18" level 4 subs from DC audio, its designed for mostly daily use but might do comps if i can find any in Colorado

this is the Box

And here is the info from the box calculator (the box is a two chamber)

What im wondering is were is the best location for the port, it will be likely facing forwards against the trunk door of my Grand Cherokee, and i was wondering if it would be better to have it on the plane of the subs or if the box would be louder facing backwards too.

will add link to sketchup when i figure it out

anyway, what do you think about it and what could i change to make it louder.

[412 CVX]

i assume the specs are per chamber? if so, very nice!

for the port placement, i think if the subs are facing the back hatch, i think a good place to put the ports is on the bottom, but on the same plane as the sub. but you don't want to suffocate the ports.

if you can't keep about 4 inches from the back hatch, i would probably consider going subs and ports up.

[Max-x]

yes the specs are per chamber, and you think the best way to go would be subs and port up? would that be louder than subs and port back or front? or just simpler?

[Trigg]

I have found that subs up and port back are the best sounding setup in a cherokee.

[Max-x]

so basically same box just rotated subs up instead of back or forwards? thats easy enough since the box is 30x30inch anyway

[412 CVX]

the only problem(s) i foresee with just flipping the box are

1) there should probably be about 4 inches from the port to the hatch, like i said, you don't want to suffocate the ports.

2) with the port on the bottom, sometimes you can have flex issues without enough bracing.

proof: @ about 2 minutes

[Max-x]

Alright i can see the port issues happening, but the box is designed 30" deep and tall and the trunk i believe has either 3 feet or 3 and a half feet deep so 36" or like 40" deep so it would have more than enough room for the extra port area between the box and the trunk door i think

[727Designs]

Sub up port back always metered best in my Cherokee, just make sure the port is well braced. My box was like Meade's though, bolt in port in the center.

[Max-x]

alrighty so since i am still a noob at box building, what will i have to do to help brace the box and the port?

edit: also and as far as that box goes vs mine the port on that box is one big long one, were my box is split into two chambers and two ports of about 20 inch each instead of one for 40"

Edited November 3, 2011 by Max-x

[412 CVX]

do you still have the sketchup model? it would be a lot easier to show you rather than tell you.