Just checking if I'm thinking of this right.
If the size of an open baffle leads to cancellation of the front and back waves say 24db down or whatever, buried, at 100hz for example, is the amount of that frequency that hits the wall behind it down 24db too?
Is it gone more or less at the baffle, or is there some other effect? Thank you!
If the size of an open baffle leads to cancellation of the front and back waves say 24db down or whatever, buried, at 100hz for example, is the amount of that frequency that hits the wall behind it down 24db too?
Is it gone more or less at the baffle, or is there some other effect? Thank you!
The cancellation of a dipole will vary with the frequency and angle. It takes time for the sound wave to travel
around the baffle to the other side (~1mS/ft), so the biggest cancellation is at the sides of the panel
where the delays from the front and the back of the panel are equal but out of phase.
At a particular frequency, you could adjust the distance from the panel to the back wall, so that a sine wave
would tend to cancel at the wall. This would be when the extra time delay for the front wave is equal to
half the wavelength at that particular frequency (or else one half plus integral multiples of the wavelength).
But all of this assumes repetitive sine waves.
around the baffle to the other side (~1mS/ft), so the biggest cancellation is at the sides of the panel
where the delays from the front and the back of the panel are equal but out of phase.
At a particular frequency, you could adjust the distance from the panel to the back wall, so that a sine wave
would tend to cancel at the wall. This would be when the extra time delay for the front wave is equal to
half the wavelength at that particular frequency (or else one half plus integral multiples of the wavelength).
But all of this assumes repetitive sine waves.
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