Hand-Held Megaphones: Rubber ring around edge of Horn
I am sure it does affect the sound, but in a very small way. If you did it with alot large horn and an audiophile driver in it, I am sure the "golden ear" crowd could tell the difference.
The way to test it would be a short burst tone and a scope to read the ringing. Or perhaps a square wave and you watch the leading edges. Or course it might only be difference of 8 cycles versus ten cycles.
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