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? bout box size, porting, & values

Discussion in 'Subwoofer Box and Custom Fabrication' started by abcgt, Dec 5, 2010.

  1. abcgt

    abcgt Member

    Hi,
    I want to build a square ported box for an Alpine 1222D . It will go into a 2000 Impala. I'd like to keep it 13" high and 12" deep. I can go wide. Below is the speaker & amp specs. Also the box I want to build... Any sugestions or changes that I can make? I think the box below is @ 1.6 without the port. With the port it drops to 1.4.
    Ooh ya, I listen to R&B, Hip Hop/Rap

    Thanks
    Alpine 1222D
    Gross internal volume. 1.7
    Net internal volume. 1.3
    Displacement. .071
    Mounting Depth. 7.7
    Tune. 36Hz

    Hifonics Brutus BRZ 1700.1D
    600 x 1 @ 4 ohms

    Box
    W 25x H 13x 12
    Port size. 1.5"
    Port lenght. 23.
    Box volume 1.4
    Tuned 35Hz
    (Does my box volume need to be more)
     
    abcgt, Dec 5, 2010
    #1
  2. Ranger SVO

    Ranger SVO Full Member

    Your box is too small, using your measurements, I'm getting 1.6 cu ft. Lets see if we can get closer to 2 cu ft.

    Can we make a couple of minor adjustments? Lets increase the depth by 2-inches and the width by an inch. That will get us an outside measurement of 13-inches High, 14-inches Deep, and 26-inches Wide. This will give us an internal volume of 2 cu ft. (OK be picky, it 1.9965 cu ft)

    Now for the port, lets use a 4-inch diameter port (standard PVC) with a length of around 11-inches.

    I think your port size and length is a miss print, there is NO way that port will work
     
    Last edited: Dec 5, 2010
    Ranger SVO, Dec 5, 2010
    #2
  3. abcgt

    abcgt Member

    Thanks for your info. Those measurements you gave me are fine. As long as I am 13" high it works. As for the port, I want to try a Square Port. I think its called that. Is there any way I can still use those sizes and add a square port?
     
    abcgt, Dec 5, 2010
    #3
  4. TheViking

    TheViking Well-Known Member

    ya you can... Its the surface area of the port that is critical, not the shape. If I remember right, i think a 4 inch diameter port has an area 12.3 sq inches.....someone correct me if i am wrong!!!!!
     
    TheViking, Dec 5, 2010
    #4
  5. abcgt

    abcgt Member

    I don't understand.. if I do a slot port how long will it need to be? I'm thinking it should be tuned to 35 or 36 Hz...
     
    abcgt, Dec 5, 2010
    #5
  6. Ranger SVO

    Ranger SVO Full Member

    OK, then lets make a small adjustment. The port will need to be 11.5-inches tall and 1.5-inches wide. The port will also need to be 18-inches long. The turn is not included in the port length

    Please follow the directions Here
     
    Ranger SVO, Dec 5, 2010
    #6
  7. tommy2tone

    tommy2tone Full Member

    Well you have the right 2 guys helping you that's for sure.Ranger and Viking both know what they're doing.
     
    tommy2tone, Dec 5, 2010
    #7
  8. abcgt

    abcgt Member

    Thanks a bunch.
    I knew my figures was off just didn't know which way to go.
    Thanks again.
     
    abcgt, Dec 5, 2010
    #8
  9. abcgt

    abcgt Member

    If I change the size of the box but keep it @ 2 cu. Ft. Can I still use a slotted port of 1.5" x 18" long?
     
    abcgt, Dec 6, 2010
    #9
  10. TheViking

    TheViking Well-Known Member

    Yes, as long as box volume stays the same as the original design, the same port design will work.
     
    TheViking, Dec 6, 2010
    #10
  11. Ranger SVO

    Ranger SVO Full Member

    The port is longer becuase the slot port takes up a little more room. Also that slot port has a little more cross sectional area than the round one. So everything will be fine. Those box measurements need to stay the same
     
    Ranger SVO, Dec 6, 2010
    #11
  12. abcgt

    abcgt Member

    I understand. Thanks :)
     
    abcgt, Dec 6, 2010
    #12