I have some questions I can't find answers too..

[filtor1 13]

I did some noob calculations and would appreciate someone varifying what I have done. I would like to do this build one shot.

Here is what I have done so far. Skip this if it doesn't help.

The box I have now, 40" L x 16" W x 16" H. Internal volume considering 3/4"MDF, I got 4.68cf - port dispacement (4.75 x 14.4 x 30) or 1.31cf = 3.37 - driver displacement of (.16 x 2) or .32 = 3.05 or 1.52cf/driver.

I did two alternate box calculations of which I am interested in one. It is as follows:

40" W x 20" W x 16" H. Internal volume considering 3/4"MDF, I got 5.97cf - port displacement (4.75" x 14.4" x 17.28") or .68cf = 5.29cf - driver displacement (.32) = 4.97cf or 2.48cf/driver

Here comes the question. I plan on facing this box into the cabin, port and subs on the same plane, and sealing it off from the trunk. Things are starting to break back there. Would there be an advantage in centering the port? Would there be an advantage to making the port wider (noise)? I will lose some internal volume that can't be made up but will be well within the range of acceptable measurements for my subs. A pair of Fi Q 12"s.

The new measurement with keeping the side port design are as follows:

5.97cf - port displacement (6.75" x 14.4" x 27.65) or 1.56cf = 4.41cf - driver displacement (.32) = 4.09cf or 2.045cf/driver.

I would lose some internal volume for the subs but would this cut down on port noise enough to justify taking up that much space? With a center port I think it will be .79cf instead of .68cf for 4" W port and 1.74cf instead of 1.56cf for 6" W port. A decrease of .11cf and .18cf respectively.

All measurements were made based upon a 32Hz tune.

I will bold the questions so they are easy to find.

I appreciate your time and assistance.

On a side note, I would like to see some technical information on port length and noise and how the driver related to this in the tech section if anyone is interested.