SM12A Headworn Microphone

The SM12A professional headworn 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.

Headworn microphone designed for sports and news announcing, interviewing and intercommunication systems, and for special events remote broadcasting. Cardioid, Dynamic.

• 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

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)

• FAQ's for SM12A