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    • 3.15.1.3: Other Acoustical Effects
      https://phys.libretexts.org/Courses/Joliet_Junior_College/JJC_-_PHYS_110/03%3A_Book-_Sound_-_An_Interactive_eBook_(Forinash_and_Christian)/3.15%3A_Acoustics/3.15.01%3A_Acoustics/3.15.1.03%3A_Other_Acoustical_Effects
      If a resonance cavity is attached to an air duct and has a resonance frequency just below the fan frequency the cavity will produce a sound wave exactly out of phase of the sound from the fan. The orc...If a resonance cavity is attached to an air duct and has a resonance frequency just below the fan frequency the cavity will produce a sound wave exactly out of phase of the sound from the fan. The orchestra or band performs at or near the focal point of the curved surface and the surface projects the sounds out in even parallel paths to the audience.

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