ECM-77B (ECM77B)

Omni-directional electret condenser microphone


Discreet wired microphone
The ECM77B is a miniature lavalier (tie clip) microphone designed to be inconspicuous. This tiny microphone runs on either phantom power or AA battery operation and comes with an XLR connector. Useful for studio, ENG, and EFP applications.
Hands free microphone
Allows the presenter to concentrate on her/his performance.


Hands free microphone
As a lapel microphone, the ECM-77B is an alternative to the traditional hand held microphone and being hands free it allows the presenter to concentrate on her/his performance
Two-way powering system
AA-size battery or external power supply.
High-performance frequency response
40-20,000 Hz.
Easy and familiar operation
The popularity of the microphone in TV production means that most sound people will be familiar with using the ECM-77.


Audio Section
Capsule Type
Electret Condenser
Frequency Response
40 Hz to 20 kHz
Sensitivity *[1]
-52.0 dB ±2 dB
Output Impedance *[2]
150Ω±20%, Balanced
Dynamic Range
90 dB or more
Signal-to-Noise Ratio *[3]
64 dB or more
Inherent Noise *[4]
30 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]
120 dB SPL
General Section
B type. Supplied with XLR-3-12C (male) connector in power supply unit (single AA size battery)
Mic Cable
9.8 feet
3 m
Power Requirements
DC 1.5 V (AA size battery) or +48 V phantom power
Battery Operating Time
Approx. 6000 h (LR6)
Power Consumption
Internal battery: 0.3 mA or less
External battery: 2 mA or less
Dimensions *[8]
o5.6 X 12.5 mm (Mic head)
o20 X 133 mm (Power unit XLR type)
o13/16 X 5 1/4 inches (Power unit XLR type)
o1/4 X 1/2 inches (Mic head)
Approx. 4.3 oz (with power supply unit)
Approx. 121.5 g (with power supply unit)
Supplied Accessories
Single/vertical type tie clip (1)
Single/horizontal type tie clip (1)
Operating instructions (1)
Mic case (1)
Metak-mesh type windscreen (1)
Double/horizontal type tie clip (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] 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.