Closed Thread
Results 1 to 8 of 8

Reload Thread: Explain graphs and specs please.

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



    Join Date
    Sep 2007
    Location
    Winslow, ME
    Posts
    579
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Explain graphs and specs please.

    I've been building boxes for a few years but basically have been doing it through trial and error. my question is how do you read graphs and how do you design a box correctly? i don't know what to do with the speaker specs and am unsure of what to do with it. What does it take to make a very good sq box and what does it take to make a very peaky spl box? Thanks a bunch guys.



    03' tiburon gt
    american bass 400.1
    2x AQ HDC3 10's
    DD component set
    Sundown 50.4
    NSB 2400
    Kenwood excelon x991
    shop pack of Damplifier pro.
    www.afterdarkcustoms.com




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



    Join Date
    Sep 2006
    Location
    Ocala/Oviedo, FL
    Age
    30
    Posts
    4,670
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Explain graphs and specs please.

    Quote Originally Posted by sikcavy View Post
    What does it take to make a very good sq box and what does it take to make a very peaky spl box? Thanks a bunch guys.
    In both cases, it takes knowledge of the vehicle and its cabin dimensions/layout.

    Trying to use any basic enclosure design software is not going to yield similar results as the vehicle's effects are not accounted for. About the only thing those are useful for is reading group delay and impedance plots but even those will change when the vehicle is introduced.

    So unless you're building an enclosure for a very large room, the graphs you're going to get from enclosure design software are pretty useless.



    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
    crash9201's Avatar
    crash9201 is offline That One Guy



    Join Date
    Feb 2009
    Location
    BumFuk, IL
    Posts
    754
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Explain graphs and specs please.

    so what program do people use to actually map out the box; im sure you could do it with any
    cad type program; but ive been looking for a program to use that is free(i never pay for software); ive been trying to design a box for quite some time and like OP i just get confused by the graphs etc.



    Ride- 2002 Nissan Altima
    Big3 Done with 2/0
    System-
    Amp: AQ1200d
    Subs: 2 10'' Kicker L7 D4s
    Wiring: 1/0 knu KLMX+4 Guage, whatever radioshack carrys
    Batt: SPV44 in the trunk; regular batt under the hood
    Cap: GONE!
    133.4
    References:
    Bought from: revrider; NWI_#73; The Low
    Traded with: BallinByNature
    Sold To: RidnClean
    feedback thread: http://www.caraudio.com/forum/showth...36#post5948436

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

    Threadstarter


    Join Date
    Sep 2007
    Location
    Winslow, ME
    Posts
    579
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Explain graphs and specs please.

    so what is port velocity and whats the big deal with it?



    03' tiburon gt
    american bass 400.1
    2x AQ HDC3 10's
    DD component set
    Sundown 50.4
    NSB 2400
    Kenwood excelon x991
    shop pack of Damplifier pro.
    www.afterdarkcustoms.com

  5. #5
    SSS 18734's Avatar
    SSS 18734 is offline Dollar Menu Millionaire



    Join Date
    Mar 2005
    Location
    Kansas City, MO
    Posts
    5,457
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Explain graphs and specs please.

    Quote Originally Posted by Immacomputer View Post
    About the only thing those are useful for is reading group delay and impedance plots but even those will change when the vehicle is introduced.
    And excursion... and port velocity... amongst others.

    Far from useless. The only thing that really changes is the response curve because of cabin gain and resonant frequencies. And even so, you can somewhat simulate cabin gain.



    Bought From:
    Absolutnockout, zachzchw, Untouchable11, j3bus2k3 (x2), 92c1v1c, jeeper07, acubsfan, bkjt05, Goldenknob, Goindef154, Basscourt2009, TeamSouthrnBass, oldschoolboomer, 99grandprixGT
    Sold to:
    Gearguy2001 (American Bass SQ780)
    Tw1st3d13 (2 Fi BL 15's)

  6. #6
    Immacomputer's Avatar
    Immacomputer is offline Cloud disappear



    Join Date
    Sep 2006
    Location
    Ocala/Oviedo, FL
    Age
    30
    Posts
    4,670
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Explain graphs and specs please.

    Quote Originally Posted by SSS 18734 View Post
    And excursion... and port velocity... amongst others.

    Far from useless. The only thing that really changes is the response curve because of cabin gain and resonant frequencies. And even so, you can somewhat simulate cabin gain.
    Excursion and port velocities are going to be off by up to 20% or more in Winisd. I'm not sure about bassbox but I know that winisd is pretty off with cone excursion as far as peaks. With port velocities, you can go by a relative scale but even then, I would rather rely on understanding the driver and enclosure I'm using. Winisd can't account for the port geometry, placement, or loading effects, all of which will affect port velocity.

    The best way I've found to simulate cabin gain is by using Matlab and modeling it as a transmission line. It's tedious as you need many dimensions of the vehicle but I was able to get a very close model to my sub in my car by modeling it as a transmission line (windows down or up) and as a mass loaded transmission line (sunroof open and windows up).

    Quote Originally Posted by crash9201 View Post
    so what program do people use to actually map out the box; im sure you could do it with any
    cad type program; but ive been looking for a program to use that is free(i never pay for software); ive been trying to design a box for quite some time and like OP i just get confused by the graphs etc.

    For physical layout, Google's Sketchup is a great cad tool. This is not enclosure design though, it is strictly a layout tool and and easy to use one at that.



    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

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

    Threadstarter


    Join Date
    Sep 2007
    Location
    Winslow, ME
    Posts
    579
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Explain graphs and specs please.

    is port velocity good or bad? and whats it deal with inrelation to tuning?



    03' tiburon gt
    american bass 400.1
    2x AQ HDC3 10's
    DD component set
    Sundown 50.4
    NSB 2400
    Kenwood excelon x991
    shop pack of Damplifier pro.
    www.afterdarkcustoms.com

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



    Join Date
    Sep 2006
    Location
    Ocala/Oviedo, FL
    Age
    30
    Posts
    4,670
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Re: Explain graphs and specs please.

    Quote Originally Posted by sikcavy View Post
    is port velocity good or bad? and whats it deal with inrelation to tuning?
    High port velocity will cause eddy currents in the port which will result in a loss of output and an increase in port noise (that chuffing or wind sound) at high volume levels. Port velocity will be at a max at the tuning frequency of the port.



    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

Closed Thread

Posting Permissions

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

1e2 Forum