Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
The most effective place to put a damper is 1/4λ or an odd-multiple from the sound source or reflector. So that means 1/4λ, 3/4λ, 5/4λ, etc. These are positions where the acoustic energy is greatest, so that's where you want to place the absorber.
While the 1/4λ distance is frequency-dependent, all frequencies require some distance for wavefront expansion. So while high-frequencies have shorter wavelengths, you can still trap them at distant odd-multiples. Lower frequencies, on the other hand have longer wavelengths so their 1/4λ nodes are further away.
So if you want to damp sound down into the vocal range, your best absorbers are either very thick or spaced away from the walls or both.
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