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. Author manuscript; available in PMC: 2014 Jul 1.
Published in final edited form as: Ear Hear. 2013 Jul;34(0 1):9S–16S. doi: 10.1097/AUD.0b013e31829d5a14

Figure A1.

Figure A1

The Thévenin equivalent circuit for the measurement of the tube or ear canal sound pressure. PS and ZS describe the equivalent pressure source and impedance of the source. ZS and PL describe the impedance of the load and the sound pressure measured at the entrance to the load.