Miniature Omni-Directional Lavalier Microphone

Highly popular on TV, in the studio and on location the ECM-77 is a great choice when you’re looking for excellent sound quality combined with robust construction and to top it off an attractive cosmetic design.

The ECM-77 is available with five different types of termination.

ECM-77B  comes with a male XLR.

ECM-77BC comes with a 4-pin locking plug for use with wireless transmitters that have HIROSE SMC9-4S connector.

ECM-77BMP comes with a 3.5mm locking jack for use with WRT-805 and UWP series wireless transmitter

ECM-77BPT comes with pre-soldered bare wire ends.

ECM-77LM comes with a 3-pin Lemo connector


Capsule Type Electret Condenser
Frequency Response40 Hz to 20 kHz
Sensitivity *[1]B Type. -52.0 dB ±2 dB
BC Type. -39.0 dB (11.2 mV)
BMP Type. -39.0 dB (11.2 mV)
BPT Type. -39.0 dB (11.2 mV)
LM Type. -39.0 dB
Output Impedance *[2]B Type. 150Ω±20%, Balanced
BC Type. 2.5kΩ±30%, Unbalanced
BMP Type. 2.5kΩ±30%, Unbalanced
BPT Type. 2.5kΩ±30%, Unbalanced
LM Type. 6.3k Ω ± 30%, Unbalanced
Dynamic Range90 dB or more
95 dB or more (LM only)
Signal-to-Noise Ratio *[3] 64 dB or more
Inherent Noise *[4]30 dB SPL or less
32 dB SPL or less (LM only)
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
127 dB SPL (LM only)
ConnectorB type. Supplied with XLR-3-12C (male) connector in power supply unit (single AA size battery)
BC type. Supplied with Sony 4-pin (SMC9-4P) connector
BMP Type. Supplied with o3.5 mm, 3-pole mini plug
BPT Type. No connector (Pigtail)
LM Type. 3-pin Lemo connector
Mic Cable B Type. 9.8 feet 3 m
BC Type. 3.9 feet 1.2 m
BMP Type.3.9 feet 1.2 m
BPT Type. 9.8 feet 3 m
LM Type. 5.25 feet 1.6 m
Power RequirementsB Type. DC 1.5 V (AA size battery) or +48 V phantom power
BC Type. DC 1.1 V to 10.0V
BMP Type. DC 1.1 V to 10.0V
BPT Type. DC 1.1 V to 10.0 V
LM Type. DC 3.0 V to 10.0V
Battery Operating TimeB Type Approx. 6000 h (LR6)
Power ConsumptionB Type. Internal battery: 0.3 mA or less External battery: 2 mA or less
BC Type. 0.4 mA or less,
BMP Type. 0.4 mA or less
BPT Type. 0.4 mA or less
LM Type. 0.4 mA or less
Dimensions *[8]BC, BMP, BPT, LM Type φ 5.6 X 12.5 mm (Mic head) φ 1/4 X 1/2 inches (Mic head)
B Type φ8.5 x 14.5 mm (Mic head) φ20.0 x 126 mm (Power unit XLR type) φ13/16 x 5 inches (Power unit XLR type) φ11/32 x 19/32 inches (Mic head)
MassB Type. Approx. 4.3 oz (with power supply unit) Approx. 121.5 g (with power supply unit)
BC Type. Approx. 25.5 g Approx. 0.9 oz
BMP Type. Approx. 22.7 g Approx. 0.8 oz
BPT Type. Approx. 22.7 g Approx. 0.8 oz
LM Type. Approx. 1.5 g (without cable) Approx. 0.053 oz (without cable)
Supplied AccessoriesSingle/horizontal type tie clip (1)
Metal-mesh type windscreen (1)
Optional AccessoriesWind screen pack
Vertical clip pack
Safety pin type clip pack
Horizontal double-clip pack
Horizontal single-clip pack
ECM-77 accessory kit
Coloured wind screen kit
Black windscreen for ECM-77
Notes*[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] Dimensions are approximate

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