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    liljojo4711's Avatar
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    box tuning




    that is my box. i want to have 2 aero ports tuned to 35hz. what size ports do i need and how long should each one be?



    1999 Mustang GT Convertible

    Refs: 02accord, 350zspl, CadillacMatt, hrtbrk1, KyleBechtold, mattman30




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    Re: box tuning

    Depending on the sub going in there then check the specs and if it calls for a 3"x6" port then just cut the length in half and keep the diameter the same....run 2x3"x3" ports (this is just an example though) also i would put the ports on the outside edge of the box as far away from the sub as possible...but that's just me. i heard once that for every 1/2" of port =1htz depending on if your addding to or taking away from the port.



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    Re: box tuning

    that box looks familiar




    Refs: themommyvan, CharlieAnderson, bassknocker23, bigbirney420, wu501, _JaY_, lrc131, R/T Pimp, NeverEnuffBass, d-REW, slapmaster, headbussaboi, edzy, adio, 1ndatrunk, jfink, k_schutte, bigredhybrid, ARSkemp, s-saudio, pimpdaddyq, AudioFreak, scarolinablazin, ssackett, kylebechtold, craigzter, etc..................

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    Re: box tuning

    If you wanted the ports in those locations, they would have to
    be 2.5" wide and 8.25" deep each. I used 2.25 cubic feet as my
    estimate of your gross box displacement, and 2.1 after woofer
    displacement. That would get you close, but it does not look like
    you have the mounting depth needed. The internal end of the port
    needs to be 3" from the back wall.

    2" ports would only have to be 5" long, but that is not enough port area.
    It's close though.



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    Re: box tuning

    so what would be ur suggestions? with 2 2" ports that are 5" long, what would my tuning be?



    1999 Mustang GT Convertible

    Refs: 02accord, 350zspl, CadillacMatt, hrtbrk1, KyleBechtold, mattman30

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    liljojo4711's Avatar
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    Re: box tuning

    Quote Originally Posted by Rashaddd View Post
    that box looks familiar
    yeah thanks a lot



    1999 Mustang GT Convertible

    Refs: 02accord, 350zspl, CadillacMatt, hrtbrk1, KyleBechtold, mattman30

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    Rashaddd's Avatar
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    Re: box tuning

    Quote Originally Posted by liljojo4711 View Post
    so what would be ur suggestions? with 2 2" ports that are 5" long, what would my tuning be?
    I didn't check, but considering he said they need to be 5" long I'm assuming he was checking how long at 35hz




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    Re: box tuning

    assuming those are outside dementions and you are using .75" material to build it, i got this:

    net box volume: 2.222 ft^3
    port area (with two 3" vents): 14.137 in^2
    port length: 12.414"
    net box volume: 2.12 ft^3
    port tuning: 35hz

    also...you can't cut the length for one 3" vent in half for two 3" ports. you have to look at overall port area and calculate the length for each port accordingly. in this case you would have two (2) 3" ports each with 12.414" of length. also, subtracting/adding .5" of port does not increase/deacrease the tuning by 1hz. port tuning isnt a linear function.

    with one 3" diameter vent, you would only need 4.81" of length. your port area would be 7.069 in^2. that "should" be OK assuming it's an aeroport. thats really driver/power dependant though.



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    Re: box tuning

    well my box is only 12" deep so there is no way i can have a port that is 12.414" long... so i should go with 1 3" port that is 4.81" long? what if i want two ports, would i need 2 2" ports or something?

    also, i will be adding bracing and my sub displacement is .14 so wont that change the tuning frequency? i want to get the box down to around 1.8-1.9 cu ft after all displacement and bracing...



    1999 Mustang GT Convertible

    Refs: 02accord, 350zspl, CadillacMatt, hrtbrk1, KyleBechtold, mattman30

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    Re: box tuning

    at 1.85 ft^3 gross (after all driver/bracing displacement but before port displacement), you will need 6.274" of length with a 3" round port. your net volume will be 1.824 ft^3. the tuning is at 35hz. also (something i forgot to mention earlier), www.psp-inc.com always adds and inch to port length measurments for flared designs. im not sure why but you should check out that site for sure. thier port lengths for non-flared designs are off a little though.



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    Re: box tuning

    i will get a flared port. so i should just get one 3" port? is there any way i can use say 2 2" ports?

    according to that site i can do 2 2" ports that are 7.01" long. that sound correct?



    1999 Mustang GT Convertible

    Refs: 02accord, 350zspl, CadillacMatt, hrtbrk1, KyleBechtold, mattman30

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    Re: box tuning

    Precision ports website is dead on with the flared port numbers, I've always used it and tested after and it was always right.



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    Re: box tuning

    And you need to leave room between the port opening and the inside walls, meaning with a 3" port you need to leave at least 3" of space all around the port opening, 4" with the 4" port etc.



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    Re: box tuning

    Quote Originally Posted by 9seconlives View Post
    Depending on the sub going in there then check the specs and if it calls for a 3"x6" port then just cut the length in half and keep the diameter the same....run 2x3"x3" ports (this is just an example though) also i would put the ports on the outside edge of the box as far away from the sub as possible...but that's just me. i heard once that for every 1/2" of port =1htz depending on if your addding to or taking away from the port.
    wow....you sir are uneducated in this topic



    Quote Originally Posted by chase007 View Post
    if u need a box...I'l taked 3 years of shop class so i know what im doing.

    after i explained to him there's more to a proper box than boards and glue and he should practice before trying to sell boxes to others

    Quote Originally Posted by chase007 View Post
    yes personaly if it was some one elce that just starting making boxes but i'v taken shop for 3 years now...Making a lil box is nothing i don't need to pratice on a box to get it right i learned alot of stuff from 1 box and i can fix that in my next box
    after i told him that customers would care about the looks of the box

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    Re: box tuning

    for (2) two inch ports i get 6.062" length on each (again, with 1.85ft^3 of airspace after sub and bracing displacement @ 35hz). that would mean 7.062" with flared ports...so you should be fine with that.

    also, i dont think the psp calculator takes into account the volume of the port in relation to the box when it gives you a length. either way though...its very, very close and should only be a 1hz difference or so at most, lol.



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