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

[528hz 10+ year member]

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:

Click to read more...

 

[528hz 10+ year member]

Where are all you box gurus? GM said he would help me, but I figured I would get an early start.

 

[cj407]

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 10+ year member]

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 5,000+ posts]

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]

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 5,000+ posts]

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 5,000+ posts]

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 10+ year member]

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 10+ year member]

patiently and eagerly awaiting 80s post...//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[thevic24 5,000+ posts]

patiently and eagerly awaiting 80s post...//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

^^^me to, have a few questions for him and his pm's are full.

(sorry for the thread jack op.)

-vic

 

[80INCHES 5,000+ posts]

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

 

[TeamRetribution 10+ year member]

Not enough room for 4 ...

 

[iamamp3pimp 5,000+ posts]

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 5,000+ posts]

http://www.the12volt.com/caraudio/boxes4.asp#1

[

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