Technical Report TR-2
"On noise distortion and harmonic distortion measurements", R. W. Peters and M. D. Burkhard, April, 1968
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Technical Report TR-3
"Vibration isolator design", R. J. Maxwell and M. D. Burkhard, January 1969
Download Technical Report TR-3 (PDF format, 2.48MB)

Technical Report TR-4
"Vibration isolation of the BL microphone", R. J. Maxwell and M. D. Burkhard, June, 1969
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Technical Report TR-5
"A wideband minature microphone", M. C. Killion and E. V. Carlson, December 1970
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Technical Report TR-6
"On making pressure measurements in insert earphone couplers and real ears", R. M Sachs and M. D. Burkhard, October, 1971
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Technical Report TR-7
"Earphone pressure in ears and couplers", R. M. Sachs and M. D. Burkhard, June, 1972
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Technical Report TR-8
"Zwislocki coupler evaluation with insert earphones", R. M. Sachs and M. D. Burkhard, November, 1972
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Technical Report TR-9
"A subminiature condenser microphone- using electret technology", E. V. Carlson, April, 1973
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Technical Report TR-10
"Subminiature directional microphones", E. V. Carlson and M. C. Killion, September, 1973
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Technical Report TR-11
"A suminiature electret condenser microphone of new design", M. C. Killion and E. V. Carlson, September, 1973
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Technical Report TR-12
"Anthropometric manikin for acoustic research", M. D. Burkhard and R. M. Sachs, July, 1975
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Technical Report TR-13
"Smoothing the hearing aid frequency response", E. V. Carlson, May, 1974
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Technical Report TR-14
"Vibration sensitivity measurements on subminiature condenser microphones", M. C. Killion, March, 1975
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Technical Report TR-15
"Probe-tube microphone assembly", E. Villchur and M. C. Killion, January, 1976
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Technical Report TR-16
"Noise of ears and microphones", M. C. Killion, February, 1976
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Technical Report TR-17
"Earmold plumbing for wideband hearing aids", M. C. Killion, April, 1976
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Technical Report TR-18
"An experimental wideband hearing aid", M. C. Killion, April, 1976
Download Technical Report TR-18 (PDF format, 525kB)

Technical Report TR-19
"Directional hearing aid capabilities", N. S. Hillman, July, 1981
Download Technical Report TR-19 (PDF format, 483kB)

Technical Report TR-20
"Technical notes on the use of the BU-1771 accelerometer cartridge", February, 1982
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Technical Report TR-21
"Directional matrix technical report", P. Madaffari, May, 1983
Download Technical Report TR-21 (PDF format, 1.49MB)