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Average Price: $567

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$401+

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Based on price data from 4 merchants for "Earthworks M23R Omnidirectional Condenser Reference Measurement Microphone". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

For those seeking precision in audio measurement, the Earthworks M23R Omnidirectional Condenser Reference Measurement Microphone stands as an unparalleled choice. Renowned for its unmatched consistency, the M23R is engineered to deliver a ruler-flat frequency response from 3Hz to 23kHz, boasting a remarkable ±0.5dB tolerance. This exceptional accuracy ensures that whether you are using SMAART, MLSSA, Spectrafoo, or any other audio analysis software, your results are reliable and replicable.

Designed for both the most demanding studio environments and the harshest outdoor settings, the M23R maintains its performance across a wide range of temperatures. Its fast impulse response is perfect for capturing the intricate details of any acoustic space, providing an uncolored and authentic representation of sound. With its robust design, the mic can handle high sound pressure levels up to 140 dB, making it versatile for various applications from room calibration to environmental noise assessment.

A staple for audio engineers and acousticians alike, the M23R's small diaphragm construction offers an accurate omnidirectional pattern with consistent sensitivity across its entire range. It also comes with a calibration chart and the option for an Electronic Calibration File (ECF) upon registration, ensuring you have the tools needed for precise measurements. The M23R is more than just a microphone; it's a commitment to audio fidelity.

Key Features:

  • Omnidirectional pattern with consistent sensitivity and frequency response (3Hz to 23kHz, ±0.5dB)
  • High SPL handling up to 140 dB
  • Low self-noise level of 20 dB SPL (A-weighted)
  • Requires 24 - 48 V phantom power
  • Includes mic calibration chart and option for Electronic Calibration File (ECF)
  • Meets ANSI Type 1 and IEC 61094 standards

Owner's manual

Earthworks M23R Omnidirectional Condenser Reference Measurement Microphone User Manual

Product specs

Microphone Type Condenser
Polar Pattern Omnidirectional
Diaphragm Size Small Diaphragm
Frequency Response 3Hz-23kHz (±0.5dB)
Max SPL 140dB SPL
Output Impedance 65 ohms
Self Noise 20dB (A weighted)
Sensitivity 36mV/Pa (-29dB)
Connector XLR
Power Source 48V phantom power
Dimensions 6.25" x 0.86"
Weight 0.35 lbs.

FAQs

What is the frequency response of the Earthworks M23R microphone?

The Earthworks M23R has a flat frequency response within an extremely tight ±0.5dB tolerance from 3Hz to 23kHz, making it ideal for precise measurement applications.

What is the primary use of the Earthworks M23R microphone?

The Earthworks M23R is primarily used as a reference measurement microphone, perfect for multi-mic measurements or audio analysis requiring high accuracy and consistency.

Does the Earthworks M23R require phantom power?

Yes, the Earthworks M23R requires 48V phantom power to operate.

How does the Earthworks M23R handle high sound pressure levels?

The Earthworks M23R can handle a maximum sound pressure level (SPL) of 140dB, making it suitable for capturing loud audio sources without distortion.

What type of polar pattern does the Earthworks M23R have?

The Earthworks M23R features an omnidirectional polar pattern, which captures sound equally from all directions, ideal for accurate sound measurement.

Reviews

PROS

  • Delivers ruler-flat frequency response from 3Hz to 22,000Hz, ideal for precise measurement

  • Robust build quality, described as "built like a tank," ensures long-term durability

  • Supplied with a hand-filled QC report and calibration file for accuracy assurance

  • Exceptional for recording complex audio environments, like waterfalls, with linear frequency capture

  • Easily integrates with high-end software for advanced audio analysis

  • Consistent frequency response across multiple units, perfect for expanding microphone kits

  • Versatile for both studio and field recording environments

  • Highly recommended for pure sound capture without coloration

CONS

  • Does not include a thread adapter, requiring additional purchase for certain mounts

  • Calibration file acquisition is not automated, can be subject to delays

Critic Reviews

Fresh From the Bench: Earthworks M23R Measurement Microphone | audioXpress

audioxpress.com

The Earthworks M23R Measurement Microphone delivers solid performance with its impressive IEC 61672 Class 1 frequency response and low noise levels, making it an excellent choice for serious acoustic measurement. Its ability to provide a flat response right out of the box without needing calibration is a standout feature, as is the option for precise matching with additional units. However, while it competes well with similarly priced models, its price point may still be a barrier for some users seeking entry-level options. Overall, the M23R is a reliable and well-crafted tool for those who require accuracy in their measurements, but budget-conscious musicians might find it a stretch.

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