Bone Conductor for audiometry

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

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.

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 regarding the BC 81 please contact


How can we help?

We are ready to answer your questions and to help put you on the right path to information. So please feel free to send us an email: