Bone Conductor for audiometry

Ortofon is the manufacturer of the new high performance RADIOEAR B-81

BC 81 2017.jpg

RADIOEAR B-81 technical data:

• High maximum output, low distortion
• Very robust product
• Dimensions: H 16 mm, L 31.7 mm, W 18.2 mm 
• Weight: 20 g
• Sensitivity:  118 dB re.1 µN @ 1 Vrms & 1 kHz
• Total Harmonic Distortion: 1% @ 1 Vrms & 1 kHz
• Impedance: 12.5 ohm @ 1 kHz
• Secured plug
NB: Measurements performed on Brüel & Kjær 4930, Artificial Mastoid with static force 5,4N.

For inquiries and supply of BC 81 please contact

BC 81 Scientific paper.png

Please retrieve your copy of the SCIENTIFIC PAPER presented at the S2 workshop, 30 October, 2013, Chalmers, Gothenburg, Sweden: A New Audiometric Bone Conductor B81 for more accurate hearing diagnostics.

Co-authors: Karl Johan Fredén Jansson*, Bo Håkansson*, Leif Johannsen** & Tomas Tengstrand***.
* Department of Signals and Systems, Chalmers University of Technology, Göteborg, Sweden, **Ortofon A/S, Denmark, ***Hörselverksamheten & The Sahlgrenska Academy, Göteborg University, Göteborg, Sweden

The objective was to evaluate the electro-acoustic performance of the new audiometric bone vibrator Radioear B81 (Radioear Corporation, New Eagle, PA, USA). Comparison was made with the present Radioear B71 that has some well-known limitations at low frequencies.

For inquiries and supply of BC 81 please contact


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