M23R

Common name: Earthworks Audio M23R

Production Status: In production

The Earthworks M23R is an omnidirectional (pressure) microphone designed for measurement purposes. It utilizes a pre-polarized condenser capsule directly coupled to a wide-band, low output impedance preamplifier. The M23R requires 24-48 V phantom power at 10 mA. It features a linear frequency response from 3 Hz to 23 kHz, very low handling noise, uniform polar pattern, and high SPL handling capabilities. Its unique circuitry excludes the transconductance of the input FET from the overall gain structure. This means the sensitivity remains very stable when the microphone is subjected to variations in ambient temperature. The M23R meets or exceeds ANSI Type 1 requirements.Each Reference Series measurement microphone is manufactured to within ±0.5 dB of each other in frequency response and sensitivity. This ensures that any microphone in the series will be matched to all others now and forever while also eliminating the necessity of ECFs (Electronic Calibration Files) in most cases. The M23R is delivered with its own calibration chart providing its individually measured open-circuit sensitivity and the frequency response curve. Should it be needed, an ECF containing the frequency response data for importing directly into measurement software is available from Earthworks upon request. A mounting clip and calibrator adapter are included with the microphone. Earthworks M23R is ideally suited for acoustical measurements, sound system setup and troubleshooting, room acoustics, or any application where an accurate measurement microphone is required. The wide linear minimum-phase response and fast clean impulse response (Fig. 2) make the M23R especially suited for time domain measurements.