Closed Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 17

Reload Thread: trying to build a big ported box, need help with ports (i have diagrams already)

  1. #1
    derek33's Avatar
    derek33 is offline CarAudio.com Elite



    Join Date
    Oct 2004
    Location
    mass
    Age
    26
    Posts
    622
    Post Thanks / Like
    Mentioned
    0 Post(s)

    trying to build a big ported box, need help with ports (i have diagrams already)

    Good evening, if you didnt already see some of my other posts, i am really interested in building myself a ported box. I am planning on using some pvc pipe as my portings, but i am sure what diameter/length to make them.

    My max dimensions are 32" wide, 27" deep, and 18" tall. I am using two mtx 15" subs. here is a quick diagram i made in mspaint.



    so all im looking for is how large my ports should be. and on the inside.... can it be one big chamer? or do i have to make a few chambers inside?
    as for the port tuning, im looking for more sq, but without sacrificing loudness.

    thanks







  2. #2
    mrray13's Avatar
    mrray13 is offline uz some fegbags



    Join Date
    Dec 2001
    Location
    IL
    Posts
    3,633
    Post Thanks / Like
    Images
    16
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    which mtx subs? that'll help determine overall box volume, as right now u have 9ft^3 gross to work with. also help determine tuning, though i'd guess in the low 30's..



    one chamber will work fine...u'll want to brace the box a little to keep flexing to a minimum and help with the spl a little.



    figuring in a couple of braces(16.5x.75x25.5 "x'd" out) and using mtx 6000 series 15's...u'll have a net volume of about 6.4ft^3, using ur current max dimensions. u'll need two 6" pvc tubes cut to 15- 5/8" to tune to 34hz.

    the displacement will change with the sub model, and that'll change the tuning some.



    hope that helps a little.





    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eeeeee



    Quote Originally Posted by lilmaniac2
    Your circles look like something a HMO doctor would do to a **** job ....
    ^^^ speaking about cbfryman's jigsaw ability




    owner of Thread posts 11111 & 12345

    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

  3. #3
    derek33's Avatar
    derek33 is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Oct 2004
    Location
    mass
    Age
    26
    Posts
    622
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    thanks.

    i currently have the mtx 8000 subs.

    by bracings do you just mean like some rods for stability purposes?

    and, is the pvc 15-5/8" long, and 6" in diameter?

    thanks again




  4. #4
    mrray13's Avatar
    mrray13 is offline uz some fegbags



    Join Date
    Dec 2001
    Location
    IL
    Posts
    3,633
    Post Thanks / Like
    Images
    16
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    i did figure the mtx 8000's....my bad, so the above numbers i posted are correct.


    the bracing keeps the box from flexing..so u can use dowl rods, i u want to use dowel rod, it'll add volume to ur box and change the tuning...u'll have to shorten the ports or ur box will be tuned lower then the 34 hz...around 31-32..which isn't a bad thing, u'll lose some spl though, but probably not enuff to notice......if u do dowels, do 4 running top to bottom and four side to side(if they will fit) and trim about an inch off the ports to maintain 34hz....use 3/4" dowels.

    here's a pic of some bracing i put in a box...







    look closely at the "X" shaped piece.....


    the above numbers figured two braces....each 3/4" thick...16-1/2" tall and 25-1/2"long and "X'd" out like in the above image.


    and yep, the 2 ports will be 6" diameter by 15-5/8" long.







    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eeeeeeeeeee



    Quote Originally Posted by lilmaniac2
    Your circles look like something a HMO doctor would do to a **** job ....
    ^^^ speaking about cbfryman's jigsaw ability




    owner of Thread posts 11111 & 12345

    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

  5. #5
    derek33's Avatar
    derek33 is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Oct 2004
    Location
    mass
    Age
    26
    Posts
    622
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    alright, thanks for your help.

    i will probably add one x shaped support longwise in between my two subs, then probaly two horizontally, maybe 3, i dont have too much space long wise because i only have 32" of space, and 30 of that is occupied by subs, but ill see what i can do.

    im not too picky on the frequency, this is the first sytem ive had, so i probably couldnt tell the difference between 34hz or 32hz, etc.

    what size particle board should i use for the box construction istelf? 3/4?




  6. #6
    DBfan187's Avatar
    DBfan187 is offline Supa's mom was here!



    Join Date
    Jan 2003
    Location
    Poolside with Supa's mom.
    Posts
    46,452
    Post Thanks / Like
    Images
    12
    Mentioned
    1 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    Quote Originally Posted by derek33
    what size particle board should i use for the box construction istelf? 3/4?
    NONE! 3/4" MDF all the way!




  7. #7
    derek33's Avatar
    derek33 is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Oct 2004
    Location
    mass
    Age
    26
    Posts
    622
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    Quote Originally Posted by DBfan187
    NONE! 3/4" MDF all the way!
    ohh mdf is a type of board? i thought it was a type of particle board or something.

    so if i went to home depot and said i need 3/4 mdf, the person would know what im talkin about?




  8. #8
    IgnoreMe's Avatar
    IgnoreMe is offline I love 2 girls 1 cup



    Join Date
    Dec 2003
    Location
    caraudio.com
    Age
    28
    Posts
    11,768
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    Quote Originally Posted by derek33
    ohh mdf is a type of board? i thought it was a type of particle board or something.

    so if i went to home depot and said i need 3/4 mdf, the person would know what im talkin about?
    yes. youll see it will say 3/4" mdf in the wood section of hoe depot.



    llllllllllllllll Educate yourself and help stop the ignorance.
    llllllllllllllll DEA Judge Francis L Young says...
    llllllllllllllll Designing a Ported Box


    refs: hazardous0388, snoopdan, karleon, thelow, freezeman_7, imtjnotu, Gebrochen, astroladespl, billabongcr , mustbenu , thunder9500 , 91ser, djdilliodon (6 times), stupify, milenko515, Zeuslicious, Bmoorman05, WaTTsLOk187, too dope 1904, nate2587, rbiele126, denalilvr



    Don't Blame Me. I Voted for Ron Paul.

    BluePoint Air Ratchet for sale...click me bitch

  9. #9
    req's Avatar
    req
    req is offline am a mod.



    Join Date
    Jul 2004
    Location
    Syracuse, NY
    Age
    28
    Posts
    15,426
    Post Thanks / Like
    Images
    21
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    yes.

    it is basically compress sawdust and glue. its very dense, and ver smooth. it looks to be a single color, but when you get up close, it basically is a bunch of little dust particles. its very tough stuff- and it dosnt soak up water like particle board - which is comprised of compressed wood chips (pretty small pieces usally, mostly used in pre-fabricated cabinets and inexpensive TV stands and such).

    particle board - somewhat brittle, and soaks up water then 'bloats' eaisly


    MDF (medium density fiberboard) 3\4" or thicker for boxes (usually) - you can tell how much denser\strong this is. i had water rain onto some MDF and it didnt soak it up. i was relieved to say the least.




  10. #10
    mrray13's Avatar
    mrray13 is offline uz some fegbags



    Join Date
    Dec 2001
    Location
    IL
    Posts
    3,633
    Post Thanks / Like
    Images
    16
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    Quote Originally Posted by Jmac
    I don't know why you'd use an "X" shaped brace as it reinforces the strongest parts of the enclosure (corners) and leaves the weakest parts (centers of the boards) untouched ...


    ummm.....that's not what we were talking about...lol....

    look at the above posted image of a box i built....it's a brace in the center between subs. some of the material is removed to the shape of an x...hence "x'd" out.





    get it? got it? good!!!! lmao








    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee



    Quote Originally Posted by lilmaniac2
    Your circles look like something a HMO doctor would do to a **** job ....
    ^^^ speaking about cbfryman's jigsaw ability




    owner of Thread posts 11111 & 12345

    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

  11. #11
    derek33's Avatar
    derek33 is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Oct 2004
    Location
    mass
    Age
    26
    Posts
    622
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    k, thanks for all your help guys, i just have a few more questions before i begin.

    1. to hold the mdf together, i plan on using 1-1/2 inch screws every so often, and liquid nales all around the seams. then caulk the korners on the inside and outside, right?

    2. i heard wrapping your box with ducked tape adds 10db, would you recomend i do this to my box? will that sacrifice sq?




  12. #12
    Join Date
    Feb 2004
    Location
    baton rouge, la
    Posts
    30
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    "2. i heard wrapping your box with ducked tape adds 10db, would you recomend i do this to my box? will that sacrifice sq?"

    ya and dont forget to paint the inside of the port black too!!! lol no man duct tape isnt gunna help u gain any db's. just take ur time, measure twice and cut once, caulk the hell out of it. good luck dude



    1999 accord 4dr. ex
    nakamichi cd-400 head unit
    alpine type r components
    kx200.2 pushin the alpines
    2 infinity perfect 12's in 3.5^3 tuned to 32 hz
    kx600.1 pushin the perfects

    "the only thing worse than Bose audio...is Bose CAR audio!!!"

  13. #13
    derek33's Avatar
    derek33 is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Oct 2004
    Location
    mass
    Age
    26
    Posts
    622
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    k, i guess it was just a myth. thanks tho, ill be sure to take tons of pics during my process too!




  14. #14
    Join Date
    Feb 2004
    Location
    baton rouge, la
    Posts
    30
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    awsome. cant wait to see it



    1999 accord 4dr. ex
    nakamichi cd-400 head unit
    alpine type r components
    kx200.2 pushin the alpines
    2 infinity perfect 12's in 3.5^3 tuned to 32 hz
    kx600.1 pushin the perfects

    "the only thing worse than Bose audio...is Bose CAR audio!!!"

  15. #15
    brandontw's Avatar
    brandontw is offline just some guy



    Join Date
    Feb 2004
    Location
    Reno, NV
    Age
    28
    Posts
    3,108
    Post Thanks / Like
    Images
    5
    Mentioned
    0 Post(s)

    Re: trying to build a big ported box, need help with ports (i have diagrams already)

    Quote Originally Posted by Jmac
    I don't know why you'd use an "X" shaped brace as it reinforces the strongest parts of the enclosure (corners) and leaves the weakest parts (centers of the boards) untouched ...
    i thought that too

    *oops sorry to bring this back to life*





Closed Thread
Page 1 of 2 1 2 LastLast

Similar Threads

  1. ported box
    By jellyfish420 in forum Enclosure Design & Construction Help
    Replies: 6
    Last Post: 10-25-2004, 07:54 PM
  2. Ported box for 4 12's
    By kickerhonda02 in forum Enclosure Design & Construction Help
    Replies: 2
    Last Post: 10-20-2004, 05:36 PM
  3. How do i make a ported box???
    By Big-Cat in forum Subwoofers
    Replies: 4
    Last Post: 09-18-2002, 11:05 PM
  4. Subzone Ported Box
    By SasquatchBump in forum Subwoofers
    Replies: 0
    Last Post: 08-03-2002, 06:22 PM
  5. ported box size++++? port+++? SPL+++?
    By dreamer in forum Subwoofers
    Replies: 1
    Last Post: 05-09-2002, 12:36 AM

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts

1e2 Forum