Closed Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 16

Reload Thread: Did I design this Tline correctly?

  1. #1
    galacticmonkey's Avatar
    galacticmonkey is offline Wants a button like that.



    Join Date
    Sep 2006
    Location
    Tampa, FL
    Posts
    7,674
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Did I design this Tline correctly?

    I did a quick read on 1/4 wave Tline design, and was wondering if I got it right. Heres a design I did for one of the cheap Elemental Design 12s. It has an F2 of 25hz I was told. So would this work? Throat length of 11.3' and a Throad width of 8"?








  2. #2
    Immacomputer's Avatar
    Immacomputer is offline Cloud disappear



    Join Date
    Sep 2006
    Location
    Ocala/Oviedo, FL
    Age
    29
    Posts
    4,641
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    If you just did the 1/4 wave of 25hz and made that the line length and the line area the Sd of the driver then no, you did not design it correctly.



    Video 1
    I may make you feel but I can't make you think.
    Your sperm's in the gutter -- your love's in the sink.
    Video 2

  3. #3
    galacticmonkey's Avatar
    galacticmonkey is offline Wants a button like that.

    Threadstarter


    Join Date
    Sep 2006
    Location
    Tampa, FL
    Posts
    7,674
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    Well what is wrong about that? And how would I go about designing it correctly?




  4. #4
    Death By Bass's Avatar
    Death By Bass is offline WHATS A SUBWOOFER!?!?!?



    Join Date
    Mar 2006
    Location
    Adelaide, Australia
    Posts
    1,602
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    it would work, but that box is huge! :p



    I am about to get banned for my stupidity.

  5. #5
    Immacomputer's Avatar
    Immacomputer is offline Cloud disappear



    Join Date
    Sep 2006
    Location
    Ocala/Oviedo, FL
    Age
    29
    Posts
    4,641
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    Quote Originally Posted by galacticmonkey View Post
    Well what is wrong about that? And how would I go about designing it correctly?
    http://www.quarter-wave.com/



    Video 1
    I may make you feel but I can't make you think.
    Your sperm's in the gutter -- your love's in the sink.
    Video 2

  6. #6
    Join Date
    Mar 2003
    Location
    Northeast
    Posts
    2,407
    Post Thanks / Like
    Mentioned
    20 Post(s)

    Re: Did I design this Tline correctly?

    Quote Originally Posted by Immacomputer View Post
    Wow. I wish I was better at math.



    Refs: Diyma.com, Caco.com

  7. #7
    Volenti's Avatar
    Volenti is offline Senior VIP Member



    Join Date
    Feb 2006
    Location
    Australia
    Posts
    271
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    It depends on what you want it to do, just eyeballing the enclosure it'll "work" as in it'll make bass, probably more suited to HT use in a room than for in a car (it may sound a little bloated in car and lack upper bass punch) , for car use I'd shorten it up some, look at 7'-8' line length with that same line area or even a little larger, 1.2-1.3x driver SD, that'll give you a little more gain.

    TL's are dramatically effected by loading in a car so you can get away with a shorter line length than the calcs/theory would suggest.




  8. #8
    Immacomputer's Avatar
    Immacomputer is offline Cloud disappear



    Join Date
    Sep 2006
    Location
    Ocala/Oviedo, FL
    Age
    29
    Posts
    4,641
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    And, the line length is not based on the driver's free air resonance but rather its point of resonance in a sealed enclosure of the same size. That will almost be higher than free-air and will never be lower.



    Video 1
    I may make you feel but I can't make you think.
    Your sperm's in the gutter -- your love's in the sink.
    Video 2

  9. #9
    Join Date
    Dec 2005
    Location
    The Colony, TX
    Age
    25
    Posts
    8,124
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    Quote Originally Posted by Immacomputer View Post
    If you just did the 1/4 wave of 25hz and made that the line length and the line area the Sd of the driver then no, you did not design it correctly.
    I am going to take a wild guess and say he saw the overgeneralized- tutorial on meades site.



    Quote Originally Posted by Second Skin Rep View Post

    so in closing...
    Don't punch babies..

    ANT
    www.secondskinaudio.com

  10. #10
    Join Date
    Mar 2007
    Location
    Bakersfield, CA
    Age
    23
    Posts
    3,353
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    I'snt the throat supposed to be taperd down ? Or it this only on some designs to cancel out standing waves?

    I created a t-line for one of my 10's (fs 25 or 28) i believe. Anyways it hits a hell lot lower then the prefab it came in... definitely a different sound.



    2x SAZ-1500 for SALE 310+ship ea
    RE MT 18" w/ juggaurnaut recone For Sale 320+ shipping


    Dakota Work Log


    References
    Bought From: IonSQL, PhatTonyDeMarco, nikosbuddy, spudracer326, RoLLaxPhile, hessdawg, JonMR2turbo, GohillaAudio, BushJ311
    Sold To: saturnspl1991, gbz007, SVT RELAMPAGO(3x Box Build),alex5897, David187, bland

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



    Join Date
    May 2007
    Location
    Knoxville/Nashville TN
    Posts
    1,292
    Post Thanks / Like
    Images
    1
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    Quote Originally Posted by Immacomputer View Post
    Did you buy King's worksheets?




  12. #12
    Volenti's Avatar
    Volenti is offline Senior VIP Member



    Join Date
    Feb 2006
    Location
    Australia
    Posts
    271
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    Quote Originally Posted by twisztdauthorit View Post
    I'snt the throat supposed to be taperd down ? Or it this only on some designs to cancel out standing waves?

    .
    You can taper it down, that can help smooth the response and decrease the length of the line you need, but at cost of output, an untapered line will have a higher output, you see all this when you start to use Martin Kings Mathcad software and model different designs.

    For the most part standing waves aren't a big issue for bass TL's, especially car ones, most of our output happens below 100hz or so, the standing wave ripples are above that so with a decent low pass filter you won't hear them.




  13. #13
    80INCHES's Avatar
    80INCHES is offline EPICENTERGLUED 2 ME



    Join Date
    Jan 2005
    Location
    WESTCHESTER, NY
    Age
    33
    Posts
    6,962
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    Quote Originally Posted by Immacomputer View Post
    If you just did the 1/4 wave of 25hz and made that the line length and the line area the Sd of the driver then no, you did not design it correctly.
    i agree and to add..its not taperd
    but it looks like a killer ported box though
    80




  14. #14
    galacticmonkey's Avatar
    galacticmonkey is offline Wants a button like that.

    Threadstarter


    Join Date
    Sep 2006
    Location
    Tampa, FL
    Posts
    7,674
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    Oh, well I designed this to be used as a box for my room, with about 75-100rms. Just as something to test out and mess around with. Anyone know of any good designs that work well for HT? I say HT, but it will only see music if built.




  15. #15
    ballstothewall's Avatar
    ballstothewall is offline CarAudio.com Veteran



    Join Date
    Feb 2005
    Location
    Kansas (KSU)
    Posts
    3,054
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Did I design this Tline correctly?

    The cross sectional area needs to be 1.5 to 2 times the Sd



    Kicking the tires, Lighting the fires.

Closed Thread
Page 1 of 2 1 2 LastLast

Posting Permissions

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

1e2 Forum