User Tag List

Closed Thread
Results 1 to 7 of 7

Reload Thread: Calculator Accuracy

  1. #1
    fasfocus00's Avatar
    fasfocus00 is offline doITdaWHITEwayORdoITtwice



    Join Date
    Jun 2007
    Location
    New Orleans, LA
    Posts
    5,406
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Calculator Accuracy

    I ran across a link a while back to a site that calculates port length for tuned frequency. It asks for box Volume and for tuning frequency as well as for round, square, or slotted port.

    my question on this is the given volume including the port displacement or not?

    to reference here is the site
    http://www.carstereo.com/help2/Articles.cfm?id=31

    thanks for all the help.



    Here is my feedback Thread: http://www.caraudio.com/forum/showth...ght=fasfocus00

    "If you ain't cheatin', You ain't trying"




  2. #2
    fasfocus00's Avatar
    fasfocus00 is offline doITdaWHITEwayORdoITtwice

    Threadstarter


    Join Date
    Jun 2007
    Location
    New Orleans, LA
    Posts
    5,406
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: Calculator Accuracy

    so out of all the ppl that build boxes here, there is not a single person that can check the site and see if the port length calculator is including or excluding the volume of the port?



    Here is my feedback Thread: http://www.caraudio.com/forum/showth...ght=fasfocus00

    "If you ain't cheatin', You ain't trying"

  3. #3
    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)
    Tagged
    0 Thread(s)

    Re: Calculator Accuracy

    It does not include port displacement.




  4. #4
    bonesninja's Avatar
    bonesninja is offline CarAudio.com Veteran



    Join Date
    Oct 2004
    Location
    Lima, Ohio
    Age
    42
    Posts
    14,803
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: Calculator Accuracy

    put in your net volume...meaning after subs and port



    Quote Originally Posted by chase007 View Post
    if u need a box...I'l taked 3 years of shop class so i know what im doing.

    after i explained to him there's more to a proper box than boards and glue and he should practice before trying to sell boxes to others

    Quote Originally Posted by chase007 View Post
    yes personaly if it was some one elce that just starting making boxes but i'v taken shop for 3 years now...Making a lil box is nothing i don't need to pratice on a box to get it right i learned alot of stuff from 1 box and i can fix that in my next box
    after i told him that customers would care about the looks of the box

    Quote Originally Posted by chase007 View Post
    if u want some thing that looks pretty why don't u find a black guy with a big d*ck.

  5. #5
    theothermike's Avatar
    theothermike is offline I HAVE NO LIFE, CA = LIFE



    Join Date
    May 2006
    Location
    Tampa
    Posts
    1,557
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: Calculator Accuracy

    wrong....

    it is asking for gross volume.

    i type in all my info for a box im making.

    i came out with 32.5" for the port length using the algebraic method by doing it on by hand, and came out with 32.43 using my gross volume that i used for my algebraic method

    volume uses gross volume so if a box is 3.55 gross and the port / sub is 1.05 and ur net becomes 2.5 than type 3.55 in the box to acquire the port length. dont use net volume.

    Mike-



    System:
    Fronts:ID Oem's & TBI Hdss Front Amps: Sundown Sax 100.2 & 100.4
    Subwoofer: 2x 12" Fi X D4s Sub Amps: Sundown Saz 1500D
    Headunit: Alpine CDA-9887 Batteries / Alternator: Powermaster / Mechman
    Deadener: Raamat BXT Ensolite Alarm: Clifford 50.5x
    References:
    -Premieraudio-Sundownz-Iamamp3pimp-Kpr10is-Jmanpc- MemphisLove-Greekpower-The 727 Kid-Gixxer9-Mobieous-Audiobahnuser18-Thewes-Steveyhustle-Gymfreak101-go_go_thrash

  6. #6
    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)
    Tagged
    0 Thread(s)

    Re: Calculator Accuracy

    Quote Originally Posted by theothermike View Post
    wrong....

    it is asking for gross volume.

    i type in all my info for a box im making.

    i came out with 32.5" for the port length using the algebraic method by doing it on by hand, and came out with 32.43 using my gross volume that i used for my algebraic method

    volume uses gross volume so if a box is 3.55 gross and the port / sub is 1.05 and ur net becomes 2.5 than type 3.55 in the box to acquire the port length. dont use net volume.

    Mike-
    That's incorrect. You must have made a mistake when calculating -- that website does not calculate the port displacement for you. You should enter the NET volume to calculate the proper length. The port displacement can't simply be calulated from the size of the port. You need to take into account factors such as folding the port, thickness of the port walls, if the port is built into a side(s) of the wall, etc.




  7. #7
    fasfocus00's Avatar
    fasfocus00 is offline doITdaWHITEwayORdoITtwice

    Threadstarter


    Join Date
    Jun 2007
    Location
    New Orleans, LA
    Posts
    5,406
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: Calculator Accuracy

    Does someone just have the formula's?



    Here is my feedback Thread: http://www.caraudio.com/forum/showth...ght=fasfocus00

    "If you ain't cheatin', You ain't trying"

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