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13.4: Electrodynamic-acoustic devices
https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electromagnetics_and_Applications_(Staelin)/13%3A_Acoustics/13.04%3A_Electrodynamic-acoustic_devices
To obtain larger motions the drive head can be connected to a mechanically tapered acoustic transmission line resembling a small solid version of a trumpet horn that smoothly matches the high mechanic...To obtain larger motions the drive head can be connected to a mechanically tapered acoustic transmission line resembling a small solid version of a trumpet horn that smoothly matches the high mechanical impedance of the driver over a large area to the low mechanical impedance of the small tip.

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