Closed Thread
Results 1 to 3 of 3

Reload Thread: ported box question

  1. #1
    mustangowner's Avatar
    mustangowner is offline still wangin'



    Join Date
    Mar 2005
    Location
    Shelby,AL
    Age
    31
    Posts
    609
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)

    ported box question

    when designing a slot ported box, do you include the port area in the volumn of the box? say you have 2 subs that need 1.25^3 per sub, so that equals 2.5^3. would i need to add the port area to that or would that include the port?





    2000 Mustang GT Coupe (yeah, it's mean)

    Headunit -Pioneer deh-p6700mp
    Amp - Power Acoustic A1800db @ 2 ohms
    Subs -RE Audio 10" SE
    Box -at home in a ported box @ 1.5 cubic ft. net tuned to 33 hz
    Components -factory mach 460
    Electrical System -Stock with "BIG 3" (2 gauge wire)
    Wiring -4 Gauge Power & Ground

    REFS: Ridnclean, schrummy, hrtbrk1, mr_kebo, Ridinhi, kharps, mk_, corto

    Quote Originally Posted by Blunt
    why is it that all these idiots wanna be heard from blocks away? Do you buy your system for everyone else or for yourself?




  2. #2
    Join Date
    Nov 2004
    Location
    Grove City, OH
    Age
    28
    Posts
    2,236
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: ported box question

    No. It's really difficult in my opinion, on how boxes are calculated.

    If you have a box that is one cubic foot, and 12" in every direction... and you have a 2"x2" port, you have to take the volume that the port displaces out of the NET volume.

    12x12x12 would be 1728cubic inches GROSS
    taking out a port that is 2"x2" and 10" long (after accounting for MDF too) would be 3.5x3.5x10, or 122.5cubic inches

    1728 - 122.5 = 1605.5 cubic inches NET. which also = 0.93 cubic feet NET.

    put it on paper, and use basic geometric shapes to find areas and volumes of the box.

    then, when you have all your areas and dimensions figured out you can use the calculator to work it.

    personally i like to design an entire box first. design the enclosure, and the port just by guessing. then you can plug all the numbers into a calculation (the one at the bottom of this post) and find out what frequency the box is tuned to.

    all of your inputs have to be in INCHES, SQUARE INCHES, or CUBIC INCHES, and the output will be a single number, the TUNING FREQUENCY.

    .159*sqrt((A*1.84*10^8)/(V*(L+.823*sqrt(A)))))

    A = port area
    V = volume of the box NET
    L = port length

    GOODLUCK




  3. #3
    mustangowner's Avatar
    mustangowner is offline still wangin'

    Threadstarter


    Join Date
    Mar 2005
    Location
    Shelby,AL
    Age
    31
    Posts
    609
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)

    Re: ported box question

    thanks





    2000 Mustang GT Coupe (yeah, it's mean)

    Headunit -Pioneer deh-p6700mp
    Amp - Power Acoustic A1800db @ 2 ohms
    Subs -RE Audio 10" SE
    Box -at home in a ported box @ 1.5 cubic ft. net tuned to 33 hz
    Components -factory mach 460
    Electrical System -Stock with "BIG 3" (2 gauge wire)
    Wiring -4 Gauge Power & Ground

    REFS: Ridnclean, schrummy, hrtbrk1, mr_kebo, Ridinhi, kharps, mk_, corto

    Quote Originally Posted by Blunt
    why is it that all these idiots wanna be heard from blocks away? Do you buy your system for everyone else or for yourself?

Closed Thread

Similar Threads

  1. Designing a ported box with George
    By IgnoreMe in forum Enclosure Design & Construction Help
    Replies: 78
    Last Post: 06-03-2005, 08:18 AM
  2. Ported box building question.
    By LightningStryk7 in forum Enclosure Design & Construction Help
    Replies: 2
    Last Post: 04-18-2005, 07:08 PM
  3. First time box buider question
    By jeffs42885 in forum Enclosure Design & Construction Help
    Replies: 0
    Last Post: 04-10-2005, 07:42 PM
  4. Large sealed box or small ported box?
    By Raven in forum Enclosure Design & Construction Help
    Replies: 3
    Last Post: 01-20-2005, 05:58 PM
  5. box question?? please help
    By bunso in forum Subwoofers
    Replies: 0
    Last Post: 01-20-2005, 07:41 AM

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