Updated 2023 iteration:

The MM 1 has been developed for the calibration of studio rooms, PA and ELA systems. In conjunction with a spectrum analyser, the sound pressure levels of loudspeakers can be checked in addition to frequency response measurements.

Due to the slim housing with the protruding microphone capsule, the influence on the sound field is very low, so that a pressure build-up at high frequencies is mostly avoided.

The transmission pattern is selected so that an exactly linear frequency response is achieved with diffuse sound input. This makes the calibration of several loudspeakers in the studio particularly easy and fast.

The MM 1 also provides valuable services when investigating sound signals in research, development and industry.

FEATURES

Individual calibration data available for 0° and 90° free-field measurement
Slimline housing for minimised effect on the acoustic surroundings
Low tolerance +/- 1.5 dB in the range between 50 Hz to 16,000 Hz
Ideal for measuring the acoustics of various surroundings
Linear frequency response at 90° (diffuse-field calibrated)
Handmade in Germany

SPECIFICATIONS

Transducer type: Condenser (back electret)
Operating principle: Pressure
Frequency res: 20 - 20,000 Hz (50 - 16,000 Hz +/-5 dB), diffuse field calibrated
Polar pattern: Omnidirectional,
Sensitivity (0 dB = 1 V/Pa): 15 mV/Pa (= -36.5 dBV) } 1 Db
Nominal impedance: 160 Ω
Nominal load impedance: ≥ 2.2 kΩ
SPL at f = 1 kHz, k = 1%, RL = 2.2 kΩ: 122 dBSPL
Signal-to-noise ratio rel. to 1 Pa: > 57 dB
A-weighted equivalent SPL: 26 dB(A)
Power supply: 12 - 48 V phantom supply
Current consumption: 9 mA
Output: electronically balanced
Connection: 3-pin XLR, male

DIMENSIONS

Length: 139 mm
Shaft diameter: 19 mm
Head diameter: 9 mm
Weight: 73 g

SUPPLIED ACCESSORY

MA-CL 21 Microphone clamp: Order # 727.946

OPTIONAL ACCESSORY

WS 10 Wind shield, charcoal grey: Order # 403.008

MM 1 Measurement Microphone, Condenser