Closed Thread
Results 1 to 3 of 3

Reload Thread: Ported Boxes... All new to me

  1. #1
    LoudCrownVic's Avatar
    LoudCrownVic is offline 1/1 of Team Team Team



    Join Date
    Dec 2003
    Location
    Scales Bump, IL
    Age
    29
    Posts
    6,122
    Post Thanks / Like
    Mentioned
    0 Post(s)

    Icon32 Ported Boxes... All new to me

    I'm building a ported box to replace my prefabbed one, which is undercubed and falling apart. I've got one all drawn up to build, but don't want to start until i get a few things clear...
    My questions:
    1. Is 2 1/3 inches from the bottom of the box enough for a 4" port tube to breathe if not, how much room does one need?
    2. Does port volume take away from the cubes of the chamber?
    3. How much bracing is suggested for a divided box made of 3/4"?
    4. Will 4" PVC work for a port tube until I get port tubes or should i make slot ports (which i don't have the faintest idea how to do)?

    If you have anything that will help , it would be greatly appreciated.



    I com to lern bout car awww-deeeee-ohhhhhs!
    Truck: 1998 Ford Ranger SC 2.5L 4 cyl 5 spd
    Mods- 195/60R15 Cooper Cobra Tires on stock rims
    System: HU- Eclipse CD8454, 2 Dayton RS180 7" midbass, Optimus 3" Horn Tweets hotglued to the dash, 3 12" JL W6v1's downfiring sealed, PPI PCX2200 @ 4 ohms, Alpine MRV-F545 mids and highs, 2 layers of Raamat on the doors.
    What's in Store:
    2 more Dayton RS180 7" midbass, 2 Bolender Grabender Neo planar tweets




  2. #2
    helotaxi's Avatar
    helotaxi is offline Kilroy was Here



    Join Date
    Dec 2003
    Location
    South Central (New Mexico that is...)
    Age
    39
    Posts
    8,933
    Post Thanks / Like
    Images
    4
    Mentioned
    0 Post(s)

    Re: Ported Boxes... All new to me

    Quote Originally Posted by LoudCrownVic
    1. Is 2 1/3 inches from the bottom of the box enough for a 4" port tube to breathe if not, how much room does one need?
    Having less than the diameter of the port for clearance will affect tuning and performance. You should plan for at least 4", but more is better.
    2. Does port volume take away from the cubes of the chamber?
    If the port is inside the box, it displaces its volume from the effective volume of the box.
    3. How much bracing is suggested for a divided box made of 3/4"?
    It depends on the size of the box and the type of sub and amount of power you will be running. Bigger box needs more bracing. More powerful sub with more power needs more bracing. The divider between the chambers is a very good brace and adds a lot of strength to the box.
    4. Will 4" PVC work for a port tube until I get port tubes or should i make slot ports (which i don't have the faintest idea how to do)?
    It will work, assuming that 4" will be big enough to minimize port turbulence for the sub you are using. The larger the excursion of the sub, the more air has to move through the port. As you decrease the amount of area that the air has to travel through, the air starts to compress and cause turbulence and noise.

    To build a slot port, figure the area of the round port that you planned for and make a rectangle with the same area. You can use the edge of the enclosure for one side of the port which makes the construction easier. Several websites have tutorials or diagrams that show you how it looks. That will make it easier to visualze, just adjust the dimensions to suit your application.



    Artificial Intelligence is no match for Natural Stupidity.

    Never underestimate the power of stupid people in large numbers.

    Life's tough...it's even tougher when you're stupid.

  3. #3
    Trixter's Avatar
    Trixter is offline Keepin it Simple



    Join Date
    Apr 2002
    Location
    Kenosha, WI
    Age
    36
    Posts
    2,608
    Post Thanks / Like
    Images
    29
    Mentioned
    0 Post(s)

    Re: Ported Boxes... All new to me

    If you are wanting to go with round ports look into precision ports at www.partsexpress.com. I have had very good experience with them.



    2006 Jeep Liberty
    Adire Audio, Cadence, Clarion, MB Quart

    Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
    *Vb = vol. in cu"
    **R = sq.rt. A / Pi (for square/slot port)

Closed Thread

Similar Threads

  1. Replies: 15
    Last Post: 12-05-2003, 12:32 AM
  2. tuned ported boxes to certain frequencies
    By iamamp3pimp in forum Enclosure Design & Construction Help
    Replies: 2
    Last Post: 11-10-2003, 03:01 AM
  3. Why are ported boxes generally bigger?
    By Bobyota in forum Enclosure Design & Construction Help
    Replies: 7
    Last Post: 07-27-2003, 02:51 AM
  4. ? bout ported boxes
    By Matador in forum Enclosure Design & Construction Help
    Replies: 1
    Last Post: 07-26-2003, 08:38 PM

Posting Permissions

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

1e2 Forum