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View Full Version : Who's willing to help me with a 4th Order? Willing to pay if need be.



528hz
04-24-2009, 04:40 PM
I want to build a 4th order bandpass for my trunk this weekend, and use my 4 RD Sonance 12s". I want the port to be going through the ski port. I figured this is the best way to get all the bass into the cab since I don't roll with my backseats down.

The ski port does NOT set flush with the floor of the trunk so I'm guessing I will need to slant the port to some degree. I DO NOT want the port going THROUGH the ski hole. I want it to set a couple of inches away from it.

I want this to have a flat response, but get low as well.

My max dimensions are as follows:

15 H x 30 W x 33 L

Ski port dimensions are : 6.5" wide x 10.5" tall


Here is what my car looks like in the trunk and backseat:


http://i87.photobucket.com/albums/k125/turbocivic_01/skiport.jpg


http://i87.photobucket.com/albums/k125/turbocivic_01/insideseatdown.jpg


http://i87.photobucket.com/albums/k125/turbocivic_01/reartrunk.jpg

528hz
04-24-2009, 05:23 PM
Where are all you box gurus? GM said he would help me, but I figured I would get an early start.

cj407
04-24-2009, 05:27 PM
theres a max of 8.5 cubes sealed with no sub displacement.....kinda small to do a 4th order for 4 12's in....if you drop to 2 of them someone may be able to help you out....

528hz
04-24-2009, 05:43 PM
theres a max of 8.5 cubes sealed with no sub displacement.....kinda small to do a 4th order for 4 12's in....if you drop to 2 of them someone may be able to help you out....


Small, really? These subs don't need gigantic ported boxes. I'm going to build a box for three of them at 1.7 cubes each too.

jdawg
04-24-2009, 05:46 PM
pm 80inches, he seems to know alot, i could model one up in bbp but i dont have enough experience to really tell how it would sound

cj407
04-24-2009, 05:49 PM
yea my dd3510 80 designed a 4th order for...ends up being 2.8 cubes for 1 10....u have to have a sealed chamber and a ported one....

iamamp3pimp
04-24-2009, 09:35 PM
heres my .02

you can possibly (im not sure how they would fit) run 2.6 sealed and 5.0 ported leaving you with about 60 inches of port area running 10-11 inches long.

not the most optimal, but it will fit.

not sure how youd mount the subs though.

iamamp3pimp
04-24-2009, 09:36 PM
4th orders dont have to be huge unless you want a lot of lows....

we are working on one thats less than 4 cubes gross for 2 12's.

528hz
04-24-2009, 11:03 PM
heres my .02

you can possibly (im not sure how they would fit) run 2.6 sealed and 5.0 ported leaving you with about 60 inches of port area running 10-11 inches long.

not the most optimal, but it will fit.

not sure how youd mount the subs though.

Well...let me see if I can illustrate this.

With my height being able to go 15 in. I can mount the subs vertical. So what I am thinking I would like to do, is basically build a box just like my present sealed one, but with the subs inside firing at each other, facing the middle of the box. I would put a piece of wood down the center of the port to prevent cancellation.

How am I doing on the wondering part?

528hz
04-24-2009, 11:14 PM
patiently and eagerly awaiting 80s post...:D

thevic24
04-24-2009, 11:37 PM
patiently and eagerly awaiting 80s post...:D

^^^me to, have a few questions for him and his pm's are full.
(sorry for the thread jack op.)

-vic

80INCHES
04-24-2009, 11:45 PM
i just saw this thread....4 12's in a 4th order with only 8.5 cubes 2 play with .....i wouldnt do it..2 yea most def..3 maybe.....and thats pushin it

80

Team Nemesis-DJ
04-24-2009, 11:47 PM
Not enough room for 4 ...

iamamp3pimp
04-25-2009, 12:00 AM
Well...let me see if I can illustrate this.

With my height being able to go 15 in. I can mount the subs vertical. So what I am thinking I would like to do, is basically build a box just like my present sealed one, but with the subs inside firing at each other, facing the middle of the box. I would put a piece of wood down the center of the port to prevent cancellation.

How am I doing on the wondering part?

remove the piece of wood and youre golden.

if its off by the slightest, it will cause you massive problems

subzero
04-25-2009, 01:01 AM
http://www.the12volt.com/caraudio/boxes4.asp#1

http://i703.photobucket.com/albums/ww35/brianncns/4thorder.jpg
http://i703.photobucket.com/albums/ww35/brianncns/2x15-folded-print.gif
http://i703.photobucket.com/albums/ww35/brianncns/wo.jpg
[

These might work? I know I am reseaching these designs myself

DNick454
04-25-2009, 01:11 AM
http://i703.photobucket.com/albums/ww35/brianncns/wo.jpg


These might work? I know I am reseaching these designs myself


That's an interesting design if I've ever seen one. A little contradiction to be honest though. Isobaric setups take a lot more power to get the same sound but you save space, and bandpass boxes are for getting the most sound out of a said woofer and amp but use up a ton of space. Why not just make a regular ported box lol? Very interesting design though.

bunkerking09
04-25-2009, 01:15 AM
That's an interesting design if I've ever seen one. A little contradiction to be honest though. Isobaric setups take a lot more power to get the same sound but you save space, and bandpass boxes are for getting the most sound out of a said woofer and amp but use up a ton of space. Why not just make a regular ported box lol? Very interesting design though.

To make things difficult, DUH!

KyleBechtold
04-25-2009, 01:15 AM
just port it with a big *** aero through it.. Idk how big you would need

subzero
04-25-2009, 01:21 AM
I did not design them. I am just
researching them.