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Acoustics: Sound Fields, Transducers and Vibration, 2nd Edition by Tim Mellow, Leo Beranek

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9.2. Electro-mechano-acoustical circuit [1]

The drive unit for a horn loudspeaker is essentially a small direct-radiator loudspeaker that couples to the throat of a flaring horn as shown in Fig. 9.1. In the next part we shall discuss the characteristics of the horn itself. In this section we restrict ourselves to that part of the frequency range where the complex mechanical impedance Z MT looking into the throat of a horn is a pure resistance:
Z M T = 1 Y M T = ρ 0 c S T N · s / m
image (9.1)
where
  • ρ 0 is density of air in kg/m3
  • c is velocity of sound in m/s
  • ρ 0 c   =   406 rayls at 22°C and 105

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