Closed Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 18

Reload Thread: What's this tuned to?

  1. #1
    jiggy2dmax's Avatar
    jiggy2dmax is offline CarAudio.com Elite



    Join Date
    Jul 2004
    Location
    NY
    Posts
    1,064
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    What's this tuned to?

    I got a veryyyy nice box from a customer today but I have no idea what its ported to. The dimensions are

    Width- 18"
    Lenth- 12"
    Height- 12"

    The port opening is about 1 1/4 inch and each part of the port is 1 1/4 inches apart and are two pieces, 10 3/4 each.







  2. #2
    bcarpenterfhl's Avatar
    bcarpenterfhl is offline Kiss Me I'm Shitfaced



    Join Date
    Sep 2004
    Location
    San Francisco/Hillsborough, CA
    Age
    26
    Posts
    2,211
    Post Thanks / Like
    Images
    17
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    Quote Originally Posted by jiggy2dmax
    The port opening is about 1 1/4 inch and each part of the port is 1 1/4 inches apart and are two pieces, 10 3/4 each.
    what?!?!? are you saying the port width is consistently 1 1/4 in., and the length is 10 3/4 in.? how tall is the port? does it make an "L" shape?




  3. #3
    sumone's Avatar
    sumone is offline CarAudio.com Veteran



    Join Date
    Dec 2003
    Location
    Midwest
    Posts
    3,416
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    is this an L-shaped port...hard to understand from your wording...

    you don't say how the port is oriented...


    if it is an l-shaped one...

    1. figure out the port length = Lv

    2. figure out & subtract the port displacement from the gross interior volume = Vb

    3. figure out the port area (1.25 * whatever) = Av

    Solve for Fb in

    (Av*1.84*10^8)/(Vb*1728*(Fb/.159)^2) - 0.823*Sqrt[Av]

    or

    TunFreq[Av_, Vb_, PLen_] := Sqrt[1/(((PLen + 0.823*Sqrt[Av] )/(Av*1.84*10^8))*(Vb * 1728)) * .159^2]



    best sig of all time

  4. #4
    jiggy2dmax's Avatar
    jiggy2dmax is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Jul 2004
    Location
    NY
    Posts
    1,064
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    ok sorry for the crappy a$$ explanation. The port lenth is 1 1/4 throught out. Its not a "L" port. It has two pieces of wood adjacent to each other forming the port and each is 10 3/4. The port is also 12inches high. Thanx guys.




  5. #5
    negativezeroz's Avatar
    negativezeroz is offline Nothing Is Promised



    Join Date
    May 2004
    Location
    -salad fingers-
    Age
    26
    Posts
    4,900
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    you know how about you draw everyone a nice pic in paint




  6. #6
    jiggy2dmax's Avatar
    jiggy2dmax is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Jul 2004
    Location
    NY
    Posts
    1,064
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    well heres a pic:




  7. #7
    pwnt by pat's Avatar
    pwnt by pat is offline Pat for Prez 2024 - vote!



    Join Date
    Sep 2004
    Location
    Pa
    Age
    27
    Posts
    2,172
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    That's freaking tiny, even at 640x480. To keep the size down, save as a JPG.



    carputer - h701 - c701 - dynaudio mw170s - si mag 15 - ss rubicon 604 x2 - ss rubicon 1002

    coming soon:
    seas w15cy - alpine spx177r tweeters

  8. #8
    jiggy2dmax's Avatar
    jiggy2dmax is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Jul 2004
    Location
    NY
    Posts
    1,064
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    Sorry the pic didn;t come out very well. Basically the port is 1/ 14 inches wide, 12 inches long and not a L shape. It has two port boards that are 10 3/4 inches long.




  9. #9
    supa_c's Avatar
    supa_c is offline Abministrator



    Join Date
    Apr 2004
    Location
    In a chair
    Posts
    19,367
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    Laberynth(sp?) port




  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)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    if ur measurements are external and the box is 3/4mdf.....the tuning is close to 45hz


    if the measurements are internal....the tuning is about 36hz


    the port is about 24 5/8" long..



    if i got the port length correct, those numbers were provided by bb6p






    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee



    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
    Str8Up's Avatar
    Str8Up is offline Lost Sheep of Israel



    Join Date
    Oct 2004
    Location
    Far From Home
    Posts
    491
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    Hey,

    What about a box with external dimensions 26"W x 17"H x 16"D using 3/4" wood.
    And the vent is 31" x 15.5" x 2"....What is the box tuned too? Btw, take away .2 cubic feet because that's how much my sub displaces.

    I'm hoping it'll be tuned around 31-33hz for my 15AE. I just don't know who I'll get to build it yet





    DECEPTION:

    Heavenly Father = Jehovah
    The Messiah/Savior = Jesus


    TRUTH:

    Heavenly Father = Yahwah
    The Messiah/Savior = Yahoshua


    THE MATRIX IS REAL!!

  12. #12
    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)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    tuned about in between 34-35hz, according to bb6p





    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eee



    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

  13. #13
    Str8Up's Avatar
    Str8Up is offline Lost Sheep of Israel



    Join Date
    Oct 2004
    Location
    Far From Home
    Posts
    491
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    Quote Originally Posted by mrray13
    tuned about in between 34-35hz, according to bb6p





    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eee

    Thanx man. It's weird how different calculators tell different things. My calculator I use says between 32 and 33hz. O well, in-car it probably won't be 3db down until around 28hz or something anyway, which is fine.

    Thanx again.





    DECEPTION:

    Heavenly Father = Jehovah
    The Messiah/Savior = Jesus


    TRUTH:

    Heavenly Father = Yahwah
    The Messiah/Savior = Yahoshua


    THE MATRIX IS REAL!!

  14. #14
    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)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    Quote Originally Posted by Str8Up
    Thanx man. It's weird how different calculators tell different things. My calculator I use says between 32 and 33hz. O well, in-car it probably won't be 3db down until around 28hz or something anyway, which is fine.

    Thanx again.


    no problem..and ur pretty close either way.





    i build boxes..pm me...









    wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee



    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

  15. #15
    jiggy2dmax's Avatar
    jiggy2dmax is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Jul 2004
    Location
    NY
    Posts
    1,064
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: What's this tuned to?

    dam 45hz, dats suxx. Anyway I can lower it, I would think by expanding the port lenth? If I can how much more port do I need to get it to about 33- 34 hz?




Closed Thread
Page 1 of 2 1 2 LastLast

Similar Threads

  1. tuned boxes??
    By sound giant in forum Subwoofers
    Replies: 9
    Last Post: 11-05-2004, 11:24 AM
  2. How do I know what this box is tuned to?
    By DToretto555 in forum Enclosure Design & Construction Help
    Replies: 2
    Last Post: 10-16-2004, 01:21 PM
  3. Replies: 5
    Last Post: 12-28-2002, 04:07 AM
  4. Is my box Tuned TO HIGH"
    By dbhittin in forum Subwoofers
    Replies: 0
    Last Post: 06-07-2002, 09:49 PM
  5. how do i build a tuned box? or a abc box?
    By Unregistered in forum General Discussion
    Replies: 0
    Last Post: 02-09-2002, 11:33 PM

User Tag List

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
1e2 Forum