Closed Thread
Results 1 to 4 of 4

Reload Thread: Questions about a ported box.

  1. #1
    NE14MX's Avatar
    NE14MX is offline Finish the Drill



    Join Date
    Dec 2004
    Location
    Georgia
    Age
    45
    Posts
    375
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Questions about a ported box.

    This is the first box I have made but I have been given the dimensions from the speaker manufacturer. It is going to be 29 x 29 x 16 inches in height. Will contain two 12 " SE subs facing up. I was told to put 4 separate 4 inch ports in the back and place the 2 subs as far back as I can above the ports. A few questions.....

    1. Does it matter how far apart i space the ports from each other and does it matter how close to the bottom they are?

    2. I'm assuming they were talking about 4 inch round ports. Where can i buy these?

    I want to do this right but kinda lost. Any help you guys could give will be appreciated







  2. #2
    joeldirt's Avatar
    joeldirt is offline Integrity



    Join Date
    Dec 2004
    Location
    Eureka, CA
    Age
    33
    Posts
    467
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)

    Re: Questions about a ported box.

    Quote Originally Posted by NE14MX
    This is the first box I have made but I have been given the dimensions from the speaker manufacturer. It is going to be 29 x 29 x 16 inches in height. Will contain two 12 " SE subs facing up. I was told to put 4 separate 4 inch ports in the back and place the 2 subs as far back as I can above the ports. A few questions.....

    1. Does it matter how far apart i space the ports from each other and does it matter how close to the bottom they are?

    2. I'm assuming they were talking about 4 inch round ports. Where can i buy these?

    I want to do this right but kinda lost. Any help you guys could give will be appreciated

    1.) Generally keep the ports the same distance or more that they are in diameter. YOu want to make sure the same amount of air is traveling in and out of the ports. if too close the air will be moving in and out of each port at different volumes and speeds, giving you an inacurate tuned frequency for what you are shooting for. YOu also want to make sure that they have enough space to achieve a good airflow. Too close to the bottom will cause a restriction to the natural movement of air, and cause a whistling, or added port noise.

    2) you can get the 4" port at your local hardware store. PVC pipe is standard port material. you can round over the ends using a round over bit and router to further reduce unwanted port nosie. If you know any plumbers, or work near a construction site, you can come acrossed alot of PVC.

    3) Did you account for bracing in your design? A solid ridgid construction is verry essential in the sound quality. Good luck.



    _____________________________________________
    Different People, Different Ways...
    _____________________________________________

  3. #3
    NE14MX's Avatar
    NE14MX is offline Finish the Drill

    Threadstarter


    Join Date
    Dec 2004
    Location
    Georgia
    Age
    45
    Posts
    375
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)

    Re: Questions about a ported box.

    Thanks for the advice. As for bracing, I do not know if tey calculated that in or not. Those were the measurements given to me by RE. Did not mention anything about bracing so I am not sure and will call them back.

    Quote Originally Posted by joeldirt
    1.) Generally keep the ports the same distance or more that they are in diameter. YOu want to make sure the same amount of air is traveling in and out of the ports. if too close the air will be moving in and out of each port at different volumes and speeds, giving you an inacurate tuned frequency for what you are shooting for. YOu also want to make sure that they have enough space to achieve a good airflow. Too close to the bottom will cause a restriction to the natural movement of air, and cause a whistling, or added port noise.

    2) you can get the 4" port at your local hardware store. PVC pipe is standard port material. you can round over the ends using a round over bit and router to further reduce unwanted port nosie. If you know any plumbers, or work near a construction site, you can come acrossed alot of PVC.

    3) Did you account for bracing in your design? A solid ridgid construction is verry essential in the sound quality. Good luck.




  4. #4
    joeldirt's Avatar
    joeldirt is offline Integrity



    Join Date
    Dec 2004
    Location
    Eureka, CA
    Age
    33
    Posts
    467
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1 Post(s)

    Re: Questions about a ported box.

    No problems, I drew out an idea for your box just doing some random brain storming. If oyu want PM me and I'll toss out a few ideas.



    _____________________________________________
    Different People, Different Ways...
    _____________________________________________

Closed Thread

Similar Threads

  1. Custom Ported Box From Woodland Cabinetry
    By stuwad21 in forum General Discussion
    Replies: 8
    Last Post: 02-25-2005, 07:18 PM
  2. ported fiberglass box.
    By derek33 in forum Enclosure Design & Construction Help
    Replies: 4
    Last Post: 02-24-2005, 05:09 PM
  3. Ported Box for....
    By kbkid in forum Enclosure Design & Construction Help
    Replies: 23
    Last Post: 11-14-2004, 07:09 PM
  4. Slot Ported Box
    By Jonahdude in forum Enclosure Design & Construction Help
    Replies: 3
    Last Post: 11-07-2004, 06:06 PM
  5. box recomendations for my trunk? needs a rebuild, low ported space
    By maniackilla in forum Enclosure Design & Construction Help
    Replies: 6
    Last Post: 10-09-2004, 12:51 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