Finding the Point of First Reflection

November 4, 2021
 by Paul McGowan

6 comments on “Finding the Point of First Reflection”

  1. Good afternoon Paul!
    What is your take on active electronic bass traps?
    I’m asking this question because, every now and then when my wife and I are either watching TV, or we’ve just called it a night and went to bed, quite a few kids come threw here blasting their music.
    And as usual, the music is very heavy with bass.
    I want to stop sounds like the one I just described from piercing my walls from the outside.
    Will the active bass traps be the perfict solution for this problem?
    Thanks in advance!

    1. Bass traps are for “taming” nodes inside your room. There are other things to sound isolate your house from the outside, but they are not cheap. Especially bass, it is quite difficult to isolate bass sounds. This is why elephants use infrasonic sounds to communicate. The infrasonic waves can go for many miles.

  2. Paul why did you choose the wall first, rather than the floor, or ceiling? In my room my ceiling is nearly as close to the tweeter as the wall. Is it that subsequent reflections are the most influencial to all the others?

    1. Because it depends on the mid range and tweeter dispersion characteristics of your speaker. Most have wider dispersion in the horizontal domain and larger relative losses in the vertical domain or a narrower dispersion. With some speakers, you still may have to “tame” the vertical reflections too. This tends to happen more with monitors designed to be on desks. Many will have switches to adjust dispersion characteristics.

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