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    "L" shaped ports

    quick question. what are the benefits of an L shaped port? and how do you calculate the length of one side to another per say a port measuring 16.5 inches deep and you want an L shape to fire down. this is for a box im building. the box is 3.72 cubes after displacement and i want it tuned to 33 hz with a port that is 5x6. so i figure the port should be 12.4 inches long in total. how can i make this an L shape







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    Re: "L" shaped ports

    L-shape helps accommodate a longer port while losing the least amount of air velocity.

    To calculate you just figure out the port length and design... just make sure to measure in the middle. You could use the RE calculator if you want, or use WinISD.



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    Re: "L" shaped ports




    Refs. --Navi--, andrew2944r, TeamPSI, FASTIMES, connersdad19, bball09124, cccullen, Team H&K, Fusion_FREAK, hemi=22s, ProjectPechkin, DaPinballWizard, FJF, Farmacist, stevexyz, cf2004, fredridge, slam, btr x's2, blackga, ZPilot, moboman, jbizzle, csb41502, davidt487, RyanM923, Blazemore, mrogowski, gordos420, Flipx99, maintrain, Mike., LoggedOut, MonkeyBone, DBBOOM, kubie, lowriderram_95, f150john, 96MaxGLE, focus_in_the_cp, twistedchild420, k_schutte, theMessenjah44, BigE, loud-n-low, nicker10, tapout, basscort2009, blackman, midwestmonstas, Pr1m3, 1phatclipse, Tirefryr, delussional77, michaellane, casper97ta, DC GTP, tenbux1970, existenz, BassAddictJ, sk8luder 97


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    Re: "L" shaped ports

    Quote Originally Posted by dave_damage View Post



    Now designing / building boxes.
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    Re: "L" shaped ports




    Refs. --Navi--, andrew2944r, TeamPSI, FASTIMES, connersdad19, bball09124, cccullen, Team H&K, Fusion_FREAK, hemi=22s, ProjectPechkin, DaPinballWizard, FJF, Farmacist, stevexyz, cf2004, fredridge, slam, btr x's2, blackga, ZPilot, moboman, jbizzle, csb41502, davidt487, RyanM923, Blazemore, mrogowski, gordos420, Flipx99, maintrain, Mike., LoggedOut, MonkeyBone, DBBOOM, kubie, lowriderram_95, f150john, 96MaxGLE, focus_in_the_cp, twistedchild420, k_schutte, theMessenjah44, BigE, loud-n-low, nicker10, tapout, basscort2009, blackman, midwestmonstas, Pr1m3, 1phatclipse, Tirefryr, delussional77, michaellane, casper97ta, DC GTP, tenbux1970, existenz, BassAddictJ, sk8luder 97


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    Re: "L" shaped ports

    ok so going off of the re calculator here is my final design. had to go with a 2.5" width due to the depth needed for the subs. here is a top view of the box that is going in my ranger (downfire). its 3.3 cubes including port displacement so its tuned to 35 hz with 41.5 square inches of port area. thx


    port view




    finishd box painted





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    Re: "L" shaped ports

    Try to make the height of the lip at least 1/2 of the port width. (I.E. the space between the port and the floor at least 1/2... but preferably more. A lot more.)



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    Re: "L" shaped ports

    the port is gona sit 6 inches off the floor




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    Re: "L" shaped ports

    Quote Originally Posted by IDSkoT View Post




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    Re: "L" shaped ports

    anyone disagree with the box i posted above?




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    Re: "L" shaped ports

    anyone check the box posted above




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    Re: "L" shaped ports

    Is your box going onto the floor (the extended peices being like legs) and firing down? Does the vehicle close one of the other sides?

    If you are firing the port into the same airapace as the subs, with 3 sides enclosed, you may be filling in the airspace your subs left (as the cones drive into the box) with the exhaust from the port.
    you thought about firing the subs down but pointing the port out of one ofthe ends of the box?




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    Re: "L" shaped ports

    Quote Originally Posted by Alex JB View Post
    Is your box going onto the floor (the extended peices being like legs) and firing down? Does the vehicle close one of the other sides?

    If you are firing the port into the same airapace as the subs, with 3 sides enclosed, you may be filling in the airspace your subs left (as the cones drive into the box) with the exhaust from the port.
    you thought about firing the subs down but pointing the port out of one ofthe ends of the box?
    no. downfiring is fine. especially in extended cab trucks. he will lose output by pointing them to the side.






    2003 chevy s-10 ext. cab
    hu: jvc kd-avx1
    precision power 356cs components
    front amp: infinity 475a
    sub: diamond audio d6 10d4
    enclosure: 1.1 cubes ported tuned @ 31hz
    sub amp: JL G1700

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    Re: "L" shaped ports

    my only question is. how much port area is it? and, what air space in the box?






    2003 chevy s-10 ext. cab
    hu: jvc kd-avx1
    precision power 356cs components
    front amp: infinity 475a
    sub: diamond audio d6 10d4
    enclosure: 1.1 cubes ported tuned @ 31hz
    sub amp: JL G1700

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    Re: "L" shaped ports

    Quote Originally Posted by kcdc30 View Post
    my only question is. how much port area is it? and, what air space in the box?
    its 3.3 cubes with sub and port displacement and tuned to 35 hz . port area=41.5 square inches




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