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    Blaze98's Avatar
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    Help Box Guru's

    I have been checking out this board for a couple of days and you guys seem to know your stuff so I am here to ask for your help. I recently built my first sealed enclosure and I think I did a pretty good job, but I am not getting the deep bass extention that I did when I had a ported box. I have never designed a ported box before so this is all new to me, I put some specs together and I would appreciate it if someone would check my math to see if I am on the right track. The dimensions are:
    H-17.5 in.
    W-32 in.
    D-14 in.
    Port-2 in. wide x 16 in. high x 24 in. long
    I am looking for tuning around 30 hz. The port will be opening on the side of the box as this gives me the best chance to construct a straight port. The box is 3.5 cubic in. before displacement of the subs and port wall for a total of 3.3 cubes total, 1.6 cubes per sub. This is going by the manufacturer's recommendations.

    Any help would be greatly appreciated, Thanks in advance.







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    Re: Help Box Guru's

    I think you gotta calculate displacement of the port area as well. A box 2.75x16x24 is .61 cubes, so i think you will have to make the box bigger to get enough cubic feet for the subs.

    So make a box that is 3.91 cubes after sub displacement(i don't know what the disp. is). When you do that the port will displace .61 cubes, which will make the box volume 3.3 cubes. Also, that will give you a tuning of ~30 hz, give or take a few tenths




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    Re: Help Box Guru's

    (sorry to interupt your thread)

    any idea on where i can find the equations for all this?

    i know how to find the volume and that stuff, but where can i find out the port sizes needed to have a certain tuning with a certain size box?



    System Setup
    -------------------------
    HU: Pioneer P80MP
    Speakers: Rainbow SLC 265 6.5" Component Speakers
    Speakers: Resonant Engineering XXX 6.5" Mids
    Sub: 15" RE XXX Subwoofer
    Amps: im looking for amps for all my speakers...a 2500d for the sub, a 2x100 @ 4 ohm for the SLC's and a 2x150 @ 2 ohm for the XXX's

    e-mail: [email protected]

    Refs
    -------------------------
    6spdcoupe, AllStar1500bd

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    Re: Help Box Guru's

    Quote Originally Posted by esco
    (sorry to interupt your thread)

    any idea on where i can find the equations for all this?

    i know how to find the volume and that stuff, but where can i find out the port sizes needed to have a certain tuning with a certain size box?
    I believe its at www.linearteam.org. Download WinIsd Pro




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  5. #5
    esco's Avatar
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    Re: Help Box Guru's

    thanx for the info



    System Setup
    -------------------------
    HU: Pioneer P80MP
    Speakers: Rainbow SLC 265 6.5" Component Speakers
    Speakers: Resonant Engineering XXX 6.5" Mids
    Sub: 15" RE XXX Subwoofer
    Amps: im looking for amps for all my speakers...a 2500d for the sub, a 2x100 @ 4 ohm for the SLC's and a 2x150 @ 2 ohm for the XXX's

    e-mail: [email protected]

    Refs
    -------------------------
    6spdcoupe, AllStar1500bd

  6. #6
    LoneRanger's Avatar
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    Re: Help Box Guru's

    win isd ***** for port calculations in most instances

    you'll have better results with the eatel amptech site....i'ma put that freakin link in my signature...i hand out more links to his site than google!!



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    Re: Help Box Guru's

    Quote Originally Posted by LoneRanger
    win isd ***** for port calculations in most instances

    you'll have better results with the eatel amptech site....i'ma put that freakin link in my signature...i hand out more links to his site than google!!
    That is the site I used to calculate my port length, it is a very useful site.




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    Re: Help Box Guru's




    System Setup
    -------------------------
    HU: Pioneer P80MP
    Speakers: Rainbow SLC 265 6.5" Component Speakers
    Speakers: Resonant Engineering XXX 6.5" Mids
    Sub: 15" RE XXX Subwoofer
    Amps: im looking for amps for all my speakers...a 2500d for the sub, a 2x100 @ 4 ohm for the SLC's and a 2x150 @ 2 ohm for the XXX's

    e-mail: [email protected]

    Refs
    -------------------------
    6spdcoupe, AllStar1500bd

  9. #9
    Blaze98's Avatar
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    Re: Help Box Guru's

    Quote Originally Posted by tommyk90
    I think you gotta calculate displacement of the port area as well. A box 2.75x16x24 is .61 cubes, so i think you will have to make the box bigger to get enough cubic feet for the subs.

    So make a box that is 3.91 cubes after sub displacement(i don't know what the disp. is). When you do that the port will displace .61 cubes, which will make the box volume 3.3 cubes. Also, that will give you a tuning of ~30 hz, give or take a few tenths
    Just curious why you multiplied the equation times 2, I am only using one board and the wall to create the port. Should I include the wall of the enclosure into the calculation for the port?




  10. #10
    tommyk90's Avatar
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    Re: Help Box Guru's

    Quote Originally Posted by Blaze98
    Just curious why you multiplied the equation times 2, I am only using one board and the wall to create the port. Should I include the wall of the enclosure into the calculation for the port?
    I didn't multiply anything by 2. since the port is 2x16x24 and the wall of the port .75 inches thick, you have to take all of that into consideration for displacement.




    Team Kicker (R.I.P.)
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    Kicker KS tweeters, MB Quart 5.25's active on an MB Quart DSC480
    Kicker wiring throughout.



  11. #11
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    Re: Help Box Guru's

    Quote Originally Posted by LoneRanger
    win isd ***** for port calculations in most instances

    you'll have better results with the eatel amptech site....i'ma put that freakin link in my signature...i hand out more links to his site than google!!
    I use both of them in conjunction. I couldn't use bcae.com for my box for some reason. So i use winisd to see what the port has to be and plug it in bcae to find out displacement and stuff.

    I always use bcae to find out box sizes though.




    Team Kicker (R.I.P.)
    Team Sundown
    Team Maxxsonics
    Team XS Power
    Team DD
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    Team B2 Audio
    Team Mechman
    Team Tantric Sounds

    2008 Bassrace 130-139.9 Regional and National Champion
    2006, 2007, 2009, 2010 and 2012 MECA Champion (S1, SR1, DB1, S2, S3, S4)

    One DD 9510 powered by two Sundown SAZ-2500's
    Kicker KS tweeters, MB Quart 5.25's active on an MB Quart DSC480
    Kicker wiring throughout.



  12. #12
    Blaze98's Avatar
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    Re: Help Box Guru's

    Quote Originally Posted by tommyk90
    I didn't multiply anything by 2. since the port is 2x16x24 and the wall of the port .75 inches thick, you have to take all of that into consideration for displacement.
    Okay, I see where I screwed up, I didn't include the 2 inches of port area into the equation when I calculated the displacement, thanks for pointing that out. You guys are very helpful.




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