Single SA12 D2 Enclosure Design help

[Zac Mikulski]

To start off i have never designed a box, so please keep that in mind. I have had 4 subwoofer setups prior to this one. i have had kenwood, kicker, alpine twice, and now i finally have something that is worth braging about. The SA12.

BRZ1200.1d

SA-12 D2

going into a Ford Focus 2012 Sedan

Now i want to build a box that is tuned to 29hz for daily/ 55hz for spl burp

dimensions available are:

Height 14.5"x Width 30"x Depth 20"

I plan on using aero ports and attaching them/ it with hurrican nuts so i can change the tuning from daily tuning of 29hz to spl burp of 55hz

This is what i came up with using Torres Calc, any input would be great!

Thanks, Zac

Edited December 30, 2012 by Zac Mikulski

[Zac Mikulski]

There was not enough Port Area Per Foot before, now there is

Edited December 30, 2012 by Zac Mikulski

[Nightshade]

While I will help you I am too lazy to figure dimensions out for you, so your on your own there. I have a shit ton of experience running those stubs (check SIG) so I can give you my opinion. If the amp that you are using does a solid 800 watts RMS this is what I would suggest. A box with 1.5-1.75 cubes after port and woofer displacement. Next the woofer should fire either straight up or to the rear of the car. I suggest placing the port on the side of the box firing into the drivers side wheel well. Also I would reccomend using 1 4" aero port cut to the length of the tuning frequency you want. A single custom made 5" aero port would be perfect but they are a lot of work to make.

If done correctly this setup will easily do 140's. I have built this exact box in Civic sedan, which is similar in size to the Focus, and done a 147.6 with a clamped 1345 watts. The setup I'm referring to was woofer firing back and port to the driver side with a 5" custom made port. I made the box tuned to 40hz and it peaked in the car at 48hz. It also would play low down to 35hz without any issues.