July 21, 200520 yr Author oldest patent I could find on a helmholtz resonator. squeak & i were talking about the helmholtz functions of a ported box the other day.
July 21, 200520 yr Admin oldest patent I could find on a helmholtz resonator. squeak & i were talking about the helmholtz functions of a ported box the other day.ok thank you for the explaination
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