Miniature omni-directional electret condenser microphone


Lavalier mic with excellent sound quality, ideal for use with DWT-B03R wireless transmitter
The Sony ECM-77 miniature lavalier microphone is seen in daily use on TV shows around the world, and is an equally familiar sight in both studio-based productions and on location.

A discreet 'hands-free' alternative to handheld microphones, its popularity is due to a combination of excellent sound quality, robust construction and an attractive cosmetic design. The miniature design of the ECM-77 makes it easy to conceal in a stage performer's costume.

The electret condenser microphone's omni-directional capsule is optimised for clear speech pick-up, with an extended frequency response, impressive sensitivity and low handling noise.

Featuring a 3-pin Lemo connector, this ECM-77LM version is an ideal partner for use with the DWT-B03R DWX Series digital wireless microphone bodypack transmitter.


Audio Section
Capsule Type
Electret Condenser
Frequency Response
40 Hz to 20 kHz
Sensitivity *[1] [7]
-39.0 dB
Output Impedance *[2] [7]
6.3k Ω ± 30%, Unbalanced
Dynamic Range
95 dB or more
Signal-to-Noise Ratio *[3]
64dB (typ.)
Inherent Noise *[4]
32 dB SPL or less
Induction Noise From External Magnetic Field *[5]
5 dB SPL or less
Wind Noise *[6]
40 dB SPL or less (with windscreen)
Maximum Input Sound Pressure Level *[7]
127 dB SPL
General Section
Small 3-pin connector
Mic Cable
5.25 feet
1.6 m
Power Requirements
DC 3.0 V to 10.0V
Power Consumption
0.4 mA or less
Dimensions *[8]
φ5.6 X 12.5 mm (Mic head)
φ1/4 X 1/2 inches (Mic head)
Approx. 1.5 g (without cable)
Approx. 0.053 oz (without cable)
Supplied Accessories
Single/horizontal type tie clip (1)
Metal-mesh type windscreen (1)
Optional Accessories
Wind screen pack
Vertical clip pack
Safety pin type clip pack
Horizontal double-clip pack
Horizontal single-clip pack
ECM-77 accessory kit
Colored wind screen kit
Black windscreen for ECM-77
*[1] 0 dB = 1 V/Pa, at 1 kHz
*[2] Output impedance at 1 kHz
*[3] IEC 179,A-weighted, 1 kHz, 1 Pa.
*[4] 0dB = 20 μPa
*[5] dB SPL/1E-7 T
*[6] Wind noise at 2m/s (0 dB SPL = 20 μPa)
*[7] Vdd:5.5V, RL:8.2kΩ
*[8] The values for dimensions are approximate.

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