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29 May 2025

SHURE SM12A-CN MICROPHONE Headworn dynamic c/w earphone

Stock code
74-6226
Brand
Shure
Model number
  • SM12A-CN
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Discontinued. Please contact Technical Support for alternatives.

SM12A Headworn Microphone

The SM12A professional heaworn microphone with receiver is a low-impedance, unidirectional, dynamic microphone with an integral earphone assembly. Designed for sports and news announcing, interviewing and intercommunication systems, and for special events remote broadcasting, the SM12A offers convenient, hands-free operation without user fatigue.

Drummers, keyboard artists and other musicians who need a vocal microphone will find the SM12A's smooth, natural voice frequency response and noise cancellation ideal for their applications.

A close-talking unit, the SM12A may be used under noisy conditions without loss or masking of voice signals.

Features

  • Includes cable, windscreen and belt clips
  • Close-talk operation and unidirectional polar pattern for effective noise reduction
  • Smooth natural voice frequency response
  • Locking adjustment knob permits boom to pivot 20 degrees in any direction
  • Boom length adjustment through 89 mm (3 1/2 in.) range
  • Built-in receiver protection circuit automatically avoids excessive sound pressure level
  • Receiver ear tube adjustable through 55 degree arc
  • Lightweight plus the dual headband eliminate user fatigue
  • Does not interfere with eyeglasses
  • Ruggedly constructed of stainless steel, aluminum and high-impact thermoplastic

Specifications

Microphone

Type
Dynamic, Close-Talking
Frequency Response At 8 mm (5/16 in.)
50 to 15,000 Hz
  
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Polar Pattern
Cardioid (unidirectional) response-uniform with frequency, symmetrical about axis
Impedance
Microphone rating impedance is 150 ohms (200 ohms actual) for connection to microphone inputs rated at 19 to 300 ohms
Sensitivity (close-talked at 1,000 Hz)
Open Circuit Voltage: -67.0 dBV/Pa (.45 mV)
(1 Pa = 94 dB SPL)
Hum Sensitivity (typical)
38.4 dB equivalent SPL in a 1 millioersted field
Phasing
Positive pressure on diaphragm produces positive voltage on pin 2 of microphone connector
Connector
Male XLR audio connector

Receiver

Type
Dynamic
Frequency Response
70 to 12,000 Hz
Impedance
2,000 ohms at 1 kHz (200-ohms cartridge with matching transformer in phone plug)
Output Level
105 dB SPL with 1.4V at 1 kHz (1.0 mW into 2 cc cavity)
Phasing
Positive voltage on phone plug tip produces positive pressure in ear tube
Connector
Phone plug (contains matching 200:2,000 ohm transformer)

General Specifications

Cable
Non-detachable, 1.5m (5 ft), four conductor, shielded, plastic-jacketed; additional 762 mm (2.5 ft), two-conductor receiver cable attached to micorphone connector.
Case
Black thermoplastic microphone and pivot housing, anodized aluminum end caps, stainless steel grille, ear tube and boom
Dimensions
See User Guide
Net Weight
84 grams (3 oz) less cable and connectors
Packaged Weight
978 grams (2 lb, 2 1/2 oz)

User Guides

SHURE MICROPHONES - SM Series

Legendary SM microphones have 'come to define the sound of live performance'. Recognisable by name and reputation, SM microphones 'are virtually indestructible professional gear, built to take the punishment of night-after-night touring. Durable and reliable, SM microphones deliver consistent vocal and instrument reproduction in any performance setting.'

Shure microphone clamps are supplied as standard with a 5/8″ thread. 5/8″ to 3/8″ adapters are available separately (stock code 53-217).