Box for 1 12" Sundown SA12

[agarabaghi 10+ year member]

Building a box for my friend's chevy aveo and figured i would build the same box for my discovery II.

I plan on running it off a Cadence A7HC (~1200@1ohm) and he will be using a Audiopipe APSM 1300 (1000@1ohm).

The box is 2.00cubic ft before displacement. Making it 1.85ft^3. I plan on running 1 4" aero port about 12.5" this gave me ~35hz tuning according to the PSP-Inc.com calculator.

Any suggestions?

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[RangerDangerV2 5,000+ posts]

more port.

 

[agarabaghi 10+ year member]

more as in 5", or more as in longer?

 

[40oz 10+ year member]

I'm building almost the same box for an SA12, I am going to use 2 x 3" aeros though to keep the port velocity down.

 

[agarabaghi 10+ year member]

I have 2 4" aeros coming, one for each box. Could i run 2 4", and if so how long should each be?

 

[agarabaghi 10+ year member]

The box is built...

 

[40oz 10+ year member]

I have 2 4" aeros coming, one for each box. Could i run 2 4", and if so how long should each be?

The ports would have to be way too long for it to work, like 30+ inches to tune in the mid 30s

 

[agarabaghi 10+ year member]

so what do you recommend? Im not apposed to buying different ports?

(2) 3" ports?

 

[agarabaghi 10+ year member]

how long are your 3" ports going to be?

 

[40oz 10+ year member]

so what do you recommend? Im not apposed to buying different ports?
(2) 3" ports?

Yes I think for that box 2 x 3" aeros is ideal. I played around with the box design for a long time and the 2 x 3" aeros was the best fit, it will give you a vent mach of 0.03 and there should be no port noise. My ports will be ~17" long to tune it around 32Hz, if you want to tune to 35Hz you can make them ~14" long.

 

[agarabaghi 10+ year member]

the calculator tells me for my 1.97ft^3 box after displacement (2) 3"x14.5 Aeroports flared. Im assuming each port is 14.5 right? not 7.25 each?

 

[40oz 10+ year member]

Yeah they would both be 14.5"

 

[agarabaghi 10+ year member]

how are you porting? I could do sub out, port side and fit 17" aeros. Or I could tune a bit higher 38, and run sub out port up. But ive never done port up in my land rover discovery II.... hmmm

 

[40oz 10+ year member]

I'm doing sub up, port up firing straight at the rear window of a hatchback. Sub and port will be on opposite ends of the baffle, I will use 90 degree elbows so the ports will be extending towards the sub inside the box.

 

[40oz 10+ year member]

What are the external dimensions of that box?