C2 Audio Team 1K 12 - aero port enclosure

[TzA]

I have 2x C2 Audio Team 1K 12's on order.

Am in the process of designing a box, but have a few questions as I have only built a few boxes in my time (and probably just got lucky that they got loud and sounded decent too..)

I want to use a single aero port rather than a slot port. I am new to aero ports and in my Google research i found that a single port is more efficient than multiple ports. Therefore, I would like to go with an 8" aero port. According to http://www.psp-inc.com/tools.html, the length required for a 35 Hz tune is 22.79".

Going in a 2013 Kia Soul, I was thinking of SUBS facing UP and PORT to the SIDE.

I am thinking: 4.0 FT^3 @ 35 Hz w/ two steel rods and double baffle (for bracing) and a single 8" x 22.79" aero-port

Mainly I am trying to figure out if the aero port will be the correct length for a 4.0 cu. ft. (net) enclosure, or maybe a 6" would be better, i don't know.

Does anyone have any input on this design?

Any modification/enhancement suggestions are also appreciated!

I can attached a SketchUp if anyone wants to take a look-see - just let me know. (I do not have them stored on this computer, but can upload them later).

[BoomZoom808]

PSP does not make a 8" precision port you would need to find someone who does or make your own.

[TzA]

PSP does not make a 8" precision port you would need to find someone who does or make your own.

Right, I wouldn't be buying from them. Found a guy on another forum that makes 8"ers. OR I will make my own. Point being, i only used that site for the calculator tool.

[timc31610]

Would that be enough port area for those two subs?

[TzA]

Would that be enough port area for those two subs?

that is one of the details I am trying to figure out.

[BoomZoom808]

aero port rule of thumb is 9-12 sq in of port per foot

[TzA]

aero port rule of thumb is 9-12 sq in of port per foot

ok, so that's where my lack of math skills comes into play...

To clarify, you are saying I need 9-12 sq in of port per cubic foot of the box, or length of the port?

[BoomZoom808]

per cube

[Krakin]

Per cube is a crap general rule. It was at one point relevant when subs didn't have insane X-max's, but with modern subs you need to actually do the forsaken, math.

You can find the formulas or you can just use the calculator for a less accurate answer.

http://www.carstereo.com/help/Articles.cfm?id=31

Just make sure when you are figuring the length of X port area that you don't exceed 1/12 of the length of the wave you are trying to tune to. When you exceed this the air inside of the port it no longer acts as a single mass.

*Port area calculations will only be within +10% of the needed area, as said by the creator of the formula himself. This man also happens to be Richard Small one of the two who created T/S parameters that are used for any modern speaker parameter.

[TzA]

Per cube is a crap general rule. It was at one point relevant when subs didn't have insane X-max's, but with modern subs you need to actually do the forsaken, math.

You can find the formulas or you can just use the calculator for a less accurate answer.

http://www.carstereo.com/help/Articles.cfm?id=31

Just make sure when you are figuring the length of X port area that you don't exceed 1/12 of the length of the wave you are trying to tune to. When you exceed this the air inside of the port it no longer acts as a single mass.

*Port area calculations will only be within +10% of the needed area, as said by the creator of the formula himself. This man also happens to be Richard Small one of the two who created T/S parameters that are used for any modern speaker parameter.

That's amazing, and much appreciated