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The 527B is wired for balanced-line operation and is recommended for use where long cable lengths are required, or areas where strong noise fields may exist. The 527B microphone can be fed directly into a standard low-impedance amplifier, or a Shure A95 Series Line Matching Transformer can be used for coupling the 527B to the input of a high-impedance amplifier. A two-conductor shielded cable can be used for extending only the microphone circuit. If both the microphone circuit and the remote circuit are to be extended, a four-conductor cable, having two shielded conductors for the microphone, should be used.

Features:

• Extended low- and high-frequency response
• Highly intelligible voice response
• Unparalleled ruggedness and reliability
• Moving coil (dynamic) element
• ARMO-DUR case
• “Million-Cycle” leaf-type switch controlling microphone and external relay or switching circuits
• Modular construction for easy field service
• “Lifetime” hang-up button and mounting bracket
• Long-life neoprene-jacketed coil cord

Specifications:

• Type: Dynamic
• Frequency Response: 300 to 5,000 Hz
• Sensitivity (at 1,000 Hz): Open Circuit Voltage: -53 dBV/Pa (2.2 mV)(1 Pascal=94 dB SPL)
• Impedance: Microphone impedance rating is 150 ohms (200 ohms actual) for connection to microphone inputs rated at 19 to 300 ohms
• Switch: Double-pole, single-throw, leaf-type
• Cable: Attached, 1.8 m (6 ft), 4-conductor (2 shielded), neoprene-jacketed
• Net Weight: 337 g (11.9 oz)
• Packaged Weight: 533 g (18.8 oz)