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Measurement Microphone M 373

Measurement Microphone M 373


The M 373 1/4 ”electret measurement microphone is a sensor that can be connected directly to the signal inputs with 48 V phantom power that is common in audio measurement technology. Typical applications are room acoustic measurements or the calibration of public address systems.

The class 1 frequency response according to IEC 61672, the extremely high sensitivity of 25 mV / Pa in this category and the 7 mm standard diameter are considered special advantages and are comparable to conventional measurement microphones. The electret capsule and the preamplifier circuit form an inseparable unit. The electrical connection of the measurement microphone is made via an XLR connector.

The measurement microphone can be calibrated with the Pistonfon 5002 and common sound pressure calibrators using a 1/4 “adapter.

The MH 22 microphone holder and the W 3 windshield are recommended as optional accessories.

Converter type Electret pressure receiver
Characteristic Bullet
Frequency range 20 Hz to 20 kHz class 1 free field
Idle transmission coefficient 25 mV / Pa ± 2.5 dB
Limit sound pressure level for 1% harmonic distortion at 1 kHz 132 dB (max.SPL, THD ≤ 1% at 1 kHz, RL = 1 kΩ)
Limit sound pressure level for 3% harmonic distortion at 1 kHz 138 dB (max.SPL, THD ≤ 3% at 1 kHz, RL = 10 kΩ)
Equivalent noise level DIN EN 60651 28 dB A (RL = 1 kOhm)
Operating current 7 mA
No-load supply voltage P 48V ± 4V
Working temperature range -20 ° C to +70 ° C
Memory for microphone identification 256 Bit 1 – Wire TM EEPROM (via IEEE 1451.4 TEDS editor)
Connectors 3-pin XLR plug, gold-plated contacts
diameter Ø 21 mm
length 130 mm

M 373 Datasheet