Should I be afraid of standing waves?

Discussion in 'Archived Threads 2001-2004' started by tom_furman, Aug 25, 2002.

  1. tom_furman

    tom_furman Stunt Coordinator

    Joined:
    Sep 6, 2000
    Messages:
    174
    Likes Received:
    0
    My 18" tube is cut to a height of 56". The only thing I have inside to break up any standing waves in a layer of polyfill and my amp that I mounted flush (it sticks into the tube about 5")

    I'm concerned that such a tall height will produce standing waves even with my amp mounted internally.

    1. Should I be worried, and are there any things I can do to prevent them?
     
  2. Shawn Solar

    Shawn Solar Supporting Actor

    Joined:
    May 12, 2001
    Messages:
    763
    Likes Received:
    0
    I believe the formula to find the mode between two parallel walls is 565/x=first room mode. or in your case the tube.

    565/5.5(your tube length)=102.7hz. Not sure if this a problem though. thick insulation on the top and bottom of your tube should suffice.
     
  3. Joe Tilley

    Joe Tilley Supporting Actor

    Joined:
    Jan 1, 2002
    Messages:
    686
    Likes Received:
    0
    Tom, I don't think you should have anything to worrie about. I just finished a 270 liter sono which is also 56" long but mine is 20" in diameter. If you line the walls with a single layer of fiber fill or acoustic foam it will control standing waves.
    I have the bottom half of mine lined with 2&1/2" acoustic foam & about 1lb of poly fill in the top half & it sounds awesome.
     

Share This Page