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Help with box for 4 15"s

Discussion in 'Subwoofer Box and Custom Fabrication' started by 502cec, May 12, 2011.

  1. 502cec

    502cec Full Member

    I am gonna be getting 4 of treo's 15" SSP's and I want to build a dual chamber box with the subs firing up towards the roof with the vent pointing towards the rear of my car. I would like to stick with slot ported box tuned at around 37. The room I have for this setup is 45"w X 48"L. Any and all help would be gratly appreciated.
     
    502cec, May 12, 2011
    #1
  2. henchman

    henchman Full Member

    4 15's

    Take your avaliable measurements, and give 3 to 5 inches for port clearance, put them into an enclosure calculator. http://www.diyaudioandvideo.com/Calculator/Box/ .... works everytime for me, but i can't figure out the ports on 4 sub enclosures, if you know how to port multiple chambers all facing rear, PLEASE let me know.
     
    henchman, May 13, 2011
    #2
  3. mmwwjr

    mmwwjr Full Member

    How big of a box are you wanting? For a small ported treo says 2.5 cubes per sub and 3 for large. What will you be running for power, and what type of vehicle?
     
    mmwwjr, Jun 11, 2011
    #3
  4. tbhenclosures

    tbhenclosures Member

    Generic numbers will get you output, but it may not be the type of output youre looking for - and certainly wont give you optimal performance.
    I could design an enclosure for you, or give us a description of what you system expectations are and we can further help you.
     
    tbhenclosures, Aug 4, 2011
    #4
  5. vincenzo

    vincenzo Full Member

    [​IMG]

    You can see how the lower ports connect to the furthest chambers, and the upper ports are shorter, providing adequate port clearance from the dividing wall.
    If all four chambers are to be tuned at the same frequencies, it's no problem. Use a port calculator, the longer/lower ports will need to be a slightly larger cross sectional area, so they will have a slightly lower air speed, it's all good.

    There's also port volumes to take into account, so the front chambers would be smaller in size to have the same volume as the rear chambers.
     
    Last edited: Aug 6, 2011
    vincenzo, Aug 6, 2011
    #5