12" Gcon Aero Port

[40oz 1]

What up SSA. Thinking about ordering a single Gcon 12" and running it ported but just want to make sure my calculations are accurate before doing so.

Volume (Net): 1.81^3 ft

Dimensions: 13.5" (H) x 30" (W) x 12" (D)

Tuning: 32.75Hz

Number/Size Port: 1 x 4"

Flared Port Length: 15.5"

Port Area (per cube): 6.94"^2

Vent Mach: 0.11

Is there enough Port Area? Is this a good size/volume for a 12" Gcon? Also, I plan on placing the woofer and port on the same baffle, on opposite ends. This would require a 90 degree elbow bend for the port but there should be over 7" of space between the end of the port and the subwoofer so I don't think that will be a problem.

[emh9009 199]

I would go with more port area.

[40oz 1]

Well I have read around that 7"^2 per cube of port area is the minimum cut-off point for Aero ports, don't know how accurate that is though. Others say it needs more...It doesn't seem to be possible to get significantly larger port area without increasing the size of the box considerably and that is not an option.

If I trim off 1" of width with same port length it gives me 7.26"^2 per cube but drops the volume down to 1.73^3 ft...Or if trim another 1" it would give me 7.66"^2 per cube but with 1.65^3 ft. Is it a good tradeoff, less volume for more port area?

Edited April 17, 2012 by 40oz

[altoncustomtech 773]

Port area is completely driver and tuning dependent. The more stroke a driver has and/or the lower the tuning the more port area that is needed to keep from having port noise. IMHO I think with the xmax that is listed for that driver a single 4" port would be okay with a single driver, especially if it's in the trunk.

[40oz 1]

Port area is completely driver and tuning dependent. The more stroke a driver has and/or the lower the tuning the more port area that is needed to keep from having port noise. IMHO I think with the xmax that is listed for that driver a single 4" port would be okay with a single driver, especially if it's in the trunk.

Thanks for the input and explanation. About that last part, it will technically be in the trunk, however, it is a hatchback and its not separated from the cabin. The sub and port itself will be only about ~3 feet away from the driver/passengers head, aimed upward at the rear window. Does this change your view?

[dbsupra 69]

4" would work but at the expense of output and possibly port noise.

I'm also not crazy about the sub and port orientation. I built a box for a single 12 and had a little over 5 inches from port to sub and had some issues with unloading.

I would prefer a slot port on the same baffle as the sub with more port area. Something more along the lines of twice what you have lol.

[pro-rabbit 64]

A single 4" port will work just fine. Just build it and try it. As long as you are using an actual flared port you won't have port noise with that setup. More then likely you will be very impressed with the end result.