• Posts
  • RSS
  • ◂◂RSS
  • Contact

  • Simple Contra Speaker Placement

    December 7th, 2016
    contra, sound  [html]
    Here's an example contra dance hall:

    What's wrong with this picture? It's going to feel way louder near the speaker than farther away:

    closest person:         1ft
    farthest person:       15ft
    effective difference: ~15x
    
    This wouldn't be so bad if people could sort themselves in the hall based on the volume they prefer, but contra doesn't let you do this. To get a more even volume distribution, get the speaker up above the dancer's heads:

    Now the difference is more like 5x. What if we get the speaker even higher?

    This does better because the speaker is now closer to being a consistent distance from people's heads (~3.5x), but it starts to sound pretty muddy. The problem is that a lot of the sound is bouncing off of the ceiling on its way to the dancers, and things sound clearest when you have as little reflection as possible. Additionally, there's a bit of a "hole" right in front of the stage, where dancers will get very little direct sound from the speaker.

    To fix this, we can angle the speakers down a little:

    Now everyone is happy.

    (I've generally used ultimate tall stands with K10 speakers that have a built-in tilter. With speakers that don't have built-in tilters it's possible to use external ones (like these) but they shift the center of gravity of your speaker in a way that might be a problem on a tall stand. Permanent "flown" installation is ideal, but most of us aren't running sound in a situation where that would make sense.)

    Comment via: google plus, facebook

    Recent posts on blogs I like:

    Some reasons to work on productivity and velocity

    A common topic of discussion among my close friends is where the bottlenecks are in our productivity and how we can execute more quickly. This is very different from what I see in my extended social circles, where people commonly say that velocity doesn…

    via Posts on Dan Luu October 15, 2021

    EDT with updating double counts

    I recently got confused thinking about the following case: Calculator bet: I am offered the opportunity to bet on a mathematical statement X to which I initially assign 50% probability (perhaps X = 139926 is a quadratic residue modulo 314159). I have acce…

    via The sideways view October 12, 2021

    Meditations on newborns

    [Content: death.]I wrote most of this a couple of months ago when Nora was a newborn, but the first few months are not that conducive to finishing blog posts. New babies put you into a liminal period, both in your own experience and in how others treat yo…

    via The whole sky October 3, 2021

    more     (via openring)


  • Posts
  • RSS
  • ◂◂RSS
  • Contact