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Noise Cancellation

The 66T microphone provides excellent noise cancellation and speech intelligibility in moderate noise environments. The microphone discriminates against all sounds more than 1/2-inch away.


The microphone is gain adjustable through an opening in the back of the microphone using a small, flat-blade screwdriver. The microphone is supplied with an adhesive label which may be placed over this opening after adjustment to prevent tampering.

Versions Available

The model 66TRA is also available which features a molded right-angle plug. All other aspects of the microphone are the same as the 66T.

FAA TSO Approval

The 66T and 66TRA microphones are approved for aviation use under FAA TSO C58.
Cord Length 5 ft (1.524 m)
Frequency Response 100-5000 Hz
Impedance 50-600 Ω
Microphone Sensitivity -48 dBV/Pa
Microphone Type Close Talking Differential, Dynamic Element
Switch Microphone and Relay Circuits Normally Open
Weight 8.99 oz (255 g)


Expand Images

66T Back 1.08 MB | November 6, 2014
66T Full 2.83 MB | November 6, 2014

Expand Service Policies

Allgemeine Lieferbedingungen 184 KB | November 30, 2016
Asia/Pacific Service Policies 2.62 MB | September 4, 2018

Expand Technical data sheets

66T FAA TSO Approval 52 KB | July 25, 2012
66T Tech Data Sheet 204 KB | July 13, 2012

Expand Warranties

EMEA BT Service Policies 227 KB | June 11, 2018
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Telex is part of the Bosch Communications Systems family of brands, offering the world's most complete portfolio of professional audio and communications solutions.

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