want to build a new box, have a few ?'s

[truckstoy]

i want to build a ported box for my 13w7, right now it is in the jl prowedge sealed box and would like to get a little more out of it.

want to use areo ports and try and keep the box around the size i have now.

was thinking 22L x 18H x 18D = 5581.12/1728 =3.22 ft3 less .21 ft3 for the sub
now that is 3.04 ft3 internal volume.

on the 1 site i used for a calc. using 2 4" ports on a 3 ft3 box tuned to 34htz it says port lenth of 16.6" so i will assume that is 16.6" ea. (not sure)

? 1. do not know how to figure out port displacement.
? 2. will this be a good box for my sub

any help would be great


mike

[psych0ticnemes1]

bump. someone help him out

[truckstoy]

thanks kris,

[ramos]

Let's see here

The 16" is for each port

Port displacement is just a matter of finding the volume of your port, then subtracting it from the volume of the enclosure. So pi*r^2*h for volume of a cylinder

Sorry can't help ya with the enclosure size, haven't dealt with too many w7's ported :)

[xluben]

are those outer dimension?

if so, you'll need to make the box quite a bit bigger to make up for mdf and port displacement.

[truckstoy]

are those outer dimension?

if so, you'll need to make the box quite a bit bigger to make up for mdf and port displacement.


those are outer dim. so i did 20.5 x 16.5 x 16.5 = 3.22 ft3
jl reccomends 2.375 for ported

i wanted to keep the box as small as i could

would a better sealed box help in my wanting more instead of the jl box

mike

[ramos]

those are outer dim. so i did 20.5 x 16.5 x 16.5 = 3.22 ft3
jl reccomends 2.375 for ported

i wanted to keep the box as small as i could

would a better sealed box help in my wanting more instead of the jl box

mike


Depends, a little larger enclosure could increase efficiency but you don't want to go too far and over power it. Ported would definately make it louder. I just don't know a good size to recommend :)

[truckstoy]

this is what i have now, would like to keep it pretty much the same only a ported box, i want sub up and port to the back but on the bottom not side so i can put a window in. http://memimage.cardomain.net/member_images/12/web/660000-660999/660387_36_full.jpg

[truckstoy]

bump

[ramos]

Looks like you got plenty of room there my brother . Might have to mount the amps in front of the enclosure though :)

[xluben]

ok, with those dimensions (22 x 18 x 18) with two 4" dia 17" long ports (http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=268-352) I get:

~3 ft^3 net, tuned to ~33Hz

Seems like a pretty good plan to me. I don't have experience with the driver, but it meets the manufacturer's specs quite well.

EDIT: forgot driver displacement, it actually comes to about 2.8 @ 34.5 Hz Just add an inch to the overall height (or width) and you're back to 3 @ 33Hz.