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Anechoic Chamber Walls: Should They be Resistive or Reactive at Low Frequencies

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Conventional anechoic chamber design methods dictate that the acoustic impedance of the chamber's boundaries should be purely resistive (complete absorption) over the whole operational range of the chamber. Theory suggests, however, that a relatively small, spherically shaped chamber could be designed that operates down to any arbitrary frequency, if the chamber walls are mass-reactive at low frequencies (where the wavelengths are much larger than the chamber) and absorptive at high frequencies. This paper explores these ideas.

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