Midwest Audio Fest

It’s that time audio enthusiasts! Registration for the 2019 Speaker Design Competition is now open! Visit for details and to list your speaker project. We are excited to see all returning participants, and look forward to meeting some new designers this year, as well! Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans. We hope to see you this summer! Vivian and Jill
See more
See less

Visitor message from garychelette


Profile Sidebar

Profile Picture
Chris Roemer
Obsessed & Proud of It
Last Activity: Today, 11:40 AM
Joined: 09-28-2005
Location: Appleton/CL

  • Visitor message from garychelette

    garychelette posted a Visitor Message for Chris Roemer
    Hi Chris.

    I have plans for the 18" sub and a box 3.5 cuft. You said a 6" port is good but how long? I was thinking 4" long but I'm not sure for that 18" Celestion. I was also going to port it out the back. If I need to port it out the front, what ports would do? 3X 4" ports?
    Thanks for any help.


  • Chris Roemer
    You can tune it properly w/a single 6"id port that's 3" long. Fb=57, F3=low 50s
    If you want more port area, then a PAIR of 6" would ea. have to be 13" long. Fb/F3 both in upper 40s
    OR, THREE 4"id vents, each one 8" long: Fb=low 50s, F3 right around 50.
  • Leave a comment: