Help with aero ports and build

[IM1THE2KING3!]

Hello all,

I'm new here and looking to build my first round/aero port enclosure.

I have built numerous sealed boxes and 2 slot ported boxes.

I recently acquired two cheap 15" subs and would like to try them out, basically test them.

Specs are as follows:

Fs(Hz): 23.4

Qms: 6.589

Vas(ft3): 5.451

Xmax(mm): 15.3

Xmech(mm): 22.95

Qes: .84

Re(ohm): 4

Voice Coil: Dual 2ohm

V.C. Diameter(in): 2.5

Rms: 1200

Max: 2800

Qts: .745

1w/1m SPL(db): 85.6

Overall Diameter(in): 15.75

Overall Height(in): 9.375

Mounting depth(in): 8.5

I have tried to list all the specs I can, if this means anything.

This is for a 1993 Chevy silverado 1500, I have deleted the rear seat and have apprx.

Width(in): 58

Depth(in): 28-30

Height(in): 26(but could go higher)

I will, more than likely, be building numerous boxes to try these subs in.

First though I want to build a box close to manufacturer specs.

4ft3

Port diameter: (2) 4(in)X11.75(in)

Tuned FB:35(HZ) F3:29(HZ)

Now as I mentioned I have never built a aero port enclosure more less one with dual(2) ports per enclosure. I plan to build this box with a separate chamber per subwoofer.

How do I properly build aero ports. Any special flanges? Router the four holes insert pvc pipe or parts express specific tubes and glue to the mdf? How far can port be from inner wall?

How do I do this??? Which way should the subs fire and ports fire, do I stack the ports(if so how much space between each) do I need them on each side of the sub, will it matter?

Front seat is a bench seat

My thought is that the sound would resonate more if ports up???

Does anyone have a writeup on the proper way to do round ports or any advice i will have a total of four ports. Two for each sub in its own chamber/box.

If this has been asked before please link me in the right direction.

Any and all help is appreciated along with DRAWINGS to help me visualize.

As well if anyone sees anything wrong with these specs and has a better design LMK as I do plan to try a few different designs, but again would like to begin with manufacturers specs.

I am not looking for record breaking SPL, I would like a little of both SPL and SQ though.

Thanks - Gill

[Joe X]

Hello welcome to the forums. Here are the ports you are looking for:

http://www.parts-express.com/pe/showdetl.cfm?partnumber=268-352

You should keep a clearance of 4" in front of either end of each port to tune properly. Don't know if you have designed the boxes you have built before, if not just have in ming¿d that the 4 cubes are net internal so to the external volume of the box you have to subtract the wood, driver and port(s) displacements to get the net internal volume. To calculate easily an aero ported box without installing anything on your computer visit this:

http://www.hometheatershack.com/forums/enclosure-volume-calculator/