Sound pressure limit

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Boundary sound pressure is a technical term from microphone technology . The limit sound pressure level for microphones is the sound pressure level measured at 1 kHz above which the distortion factor is greater than 0.5%.

In the microphone data, the limit sound pressure level is always given in decibels (dB) and often with a max. SPL or SPL max. abbreviated ( Engl. maximum sound pressure level ).

Usually, the sound pressure level of condenser microphones is 120 to 130 dB, and moving coil microphones around 150 to 160 dB. If the limit sound pressure level is exceeded, it is not the microphone capsule but the internal microphone amplifier / impedance converter that is overwhelmed. Dynamic microphones are more robust in this regard because they have a heavy diaphragm . Often the limit sound pressure level for these microphone types is not even given.

There are few microphone manufacturers who do not adhere to the measured value of the limit sound pressure level at 0.5% distortion factor. With a measured value of 1% distortion factor (THD = Total Harmonic Distortion ), these apparently "better" microphone data . In order to be able to compare these microphones with those measured at 0.5% distortion factor, 6 dB should be subtracted from the specified too high dB value of the limit sound pressure level.

literature

  • Thomas Görne: Microphones in theory and practice. 8th edition, Elektor-Verlag, Aachen, 2007, ISBN 978-3-89576-189-8
  • Michael Dickreiter, Volker Dittel, Wolfgang Hoeg, Martin Wöhr (eds.), "Handbuch der Tonstudiotechnik", 8th, revised and expanded edition, 2 volumes, publisher: Walter de Gruyter, Berlin / Boston, 2014, ISBN 978-3- 11-028978-7 or e- ISBN 978-3-11-031650-6

Web links