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The Shure Model SM12A Professional Head-Worn 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 -- one that will not pick up unwanted sounds -- 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.

SM12A-CN includes cable

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
• Light weight plus dual headband eliminate user fatigue
• Does not interfere with eyeglasses
• Ruggedly constructed of stainless steel, aluminum and high-impact thermoplastic
• Convenient, secure clips attach connectors to belt or clothing

Specifications:

• Type: Dynamic, Close-Talking
• Frequency Response At 8 mm (5/16 in.): 50 to 15,000 Hz
• 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 (TA3M)

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
• Net Weight: 84 grams (3 ounces) less cable and connectors
• Packaged Weight: 978 grams (2 lb, 2 1/2 oz)