Miniature cardioid directional lapel Electret condenser microphone


The ECM-66B miniature, lapel microphone is suitable for voice and musical instrument pick-up in noisy environments. The cardioid polar response allows the microphone to be positioned for picking up the sound source while rejecting background noises. It is supplied with a integral power barrel and it is terminated with an XLR connector.
Hands Free microphone
As a lapel microphone, the ECM-66B is an alternative to the traditional hand held microphone and being 'hands free' it allows the presenter to concentrate on her/his performance.
Simple to use in public address systems.
As a cardioid polar response microphone, the ECM-66B can help to reduce the potential problem of microphone 'howl round'. The alternative omni-directional microphones are more prone to creating audio feedback loops.
Versatile performance
The ECM-66B has an extended frequency response and high SPL handling, making it highly versatile.


Designed for a wide range of audio sources
The ECM-66B's capsule features an extended frequency response and it can handle high SPL signals.
Compact size
The capsule has a diameter of only 10.6mm and is 24mm long, making it easy to conceal.
Ready for wired applications
The ECM-66B is the wired microphone version with an XLR output and integral power supply barrel. It can either be powered by the external microphone amp or an internal battery (LR6/AA size).


Audio Section
Capsule Type
Electret Condenser
Frequency Response
70 Hz to 14 kHz
Sensitivity *[1]
-36.5dB ±2 dB
Output Impedance *[2]
2.5kΩ±30%, Unbalanced
Dynamic Range
101 dB or more
Signal-to-Noise Ratio *[3]
65 dB or more
Inherent Noise *[4]
29 dB SPL or less
Induction Noise From External Magnetic Field *[5]
5 dB SPL or less
Wind Noise *[6]
50 dB SPL or less (with windscreen)
Maximum Input Sound Pressure Level *[7]
130 dB SPL
General Section
BC type. Supplied with Sony 4-pin (SMC9-4P) connector
Mic Cable
3.9 feet
1.2 m
Power Requirements
DC 1.1 V to 10.0 V
Power Consumption
0.4 mA or less
Dimensions *[8]
o7/16 X 31/32 inches (Mic head)
o10.6 X 24.2 mm (Mic head)
Approx. 31.2 g
Approx. 1.1 oz
Supplied Accessories
Urethane type windscreen (1)
Single/vertical type tie clip (1)
Single/horizontal type tie clip (1)
Operating instructions (1)
Mic case (1)
Optional Accessories
Wind screen pack
Horizontal single-clip pack
*[1] 0 dB = 1 V/Pa, at 1 kHz
*[2] Output impedance at 1 kHz
*[3] A-weighted, 1 kHz, 1 Pa.
*[4] 0dB SPL = 20? Pa.
*[5] dB SPL/1E-7 T, 0 dB SPL = 20? Pa.
*[6] Wind noise at 2m/s (0 dB SPL = 20?Pa.)
*[7] 0 dB SPL = 20? Pa.
*[8] The values for dimensions are approximate.