Sub box size

[yogi_pahl]

How do you figure what size box you need for a ported box and how big to make the port. I bet it right in front of my face i just dont know what all the terms mean.

Hear ar the spec on my sup I have no idea what they all mean tho.

Model...AP15
Nom Imped....2x2
Fs(Hz)...25
Re(Ohm)...2x1.8
Le(mH)...5.3
QMS...7.53
QES...0.48
QTS ...0.42
VAS cu.ft...3.57
VAS liter...100
Power Watt RMS... 1000
Power Watts Peak...2000
SPL db @1w/1m...98.3
X-Max inches...0.45
X-Max(mm)...13
Max Vented...4.0
PortRound...3 X 10
MinVented...3.5
PortRound...3 X 8
MaxSealed...3.5
MinSealed...3.0

[yogi_pahl]

Anyone................. :(

[Mdtdnb]

it will vary on the actual box size/shape. generally it says you will need a box to be between 3.5 cubic ft (volume) and 4.0 cubic feet. The port will need to be circular @ 3 inches in diameter and 10 inches long. It does not however say how much space you need between the back of the port and the box wall itself. I would say at least 1" if you can. Ported boxes are MUCH larger. If you want to save space, go sealed. a sealed box will need to be 3.0 and 3.5 cubic feet. are these the specs for 1 sub or two? seems a little big for just 1.

[yogi_pahl]

Is a audiopipe 15' and i got them from the site it is a big o sub but i think they might up the spec up a lil bit.I think my box is about 5f3. the port hole
2 x 15 and about 3 inches from the back of the box. So if i just got a block off wood about 1f3 and screwed and glued it in the box it would then my my box be 4f3 right? also what could i do to fix the port.

[Mdtdnb]

well, if you have 2 subs, you will need 2 ports to make the calculations easier and to keep each sub firing equally. What are the dimensions of your box in inches? diameter/shape of the port?

[yogi_pahl]

Hear is my box.
http://i78.photobucket.com/albums/j113/GAkiller20/sup.jpg

[Mdtdnb]

ok your box is 3.6 cubic feet. That is just about right for a ported setup but it looks like your port is a bit too big. The port volume should only be about .04 cubic feet, (10x3 cylinder OR about 2x4x10 rectangular). Your port is .27 cubic feet.

It looks like your particular sub is not made for a rectangular port if you are looking to be exact. That is a pretty general size so it will still probably sound good. If you do want it to the specs, I recommend a box the same size you have with the port that is a cylinder.

If it were me, I would roll with what you got and see how it sounds. I doubt you will be able to hear the difference overall.