• 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:

    Governance in Rich Liberal American Cities

    Matt Yglesias has a blog post called Make Blue America Great Again, about governance in rich liberal states like New York and California. He talks about various good government issues, and he pays a lot of attention specifically to TransitMatters and our …

    via Pedestrian Observations November 19, 2020

    Collections: Why Military History?

    This week, I want to talk about the discipline of military history: what it is, why it is important and how I see my own place within it. This is going to be a bit of an unusual collections post as it is less about the past itself and more about how we st…

    via A Collection of Unmitigated Pedantry November 13, 2020

    Misalignment and misuse: whose values are manifest?

    Crossposted from world spirit sock puppet. AI related disasters are often categorized as involving misaligned AI, or misuse, or accident. Where: misuse means the bad outcomes were wanted by the people involved, misalignment means the bad outcomes were wan…

    via Meteuphoric November 13, 2020

    more     (via openring)


  • Posts
  • RSS
  • ◂◂RSS
  • Contact