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The Shure 550L is an omnidirectional dynamic base station microphone with a frequency response specially tailored for voice intelligibility. It is equally useful for radio communications, paging and dispatching systems, and its low-impedance connection makes it adaptable to most PA amplifiers. The low-impedance design also makes it useful for long runs of cable, or under severe hum disturbance conditions.

The microphone is not affected by heat or humidity. Its exclusive ARMO-DUR case is immune to oil, grease, fumes, salt spray, sun, rust, and corrosion -- and is outstanding in its ability to resist mechanical shocks and vibration. The "Million-Cycle" leaf-type switch is designed to withstand rigorous operating conditions and constant use.

550L low impedance

Features:

• Low-impedance operation
• Crisp, natural, high-intelligibility voice response
• Fingertip control bar actuates microphone circuit and external relay or control circuit
• Long-life switch meets rigorous requirements of communications and paging systems
• Sturdy, high-impact ARMO-DUR base and microphone case resists corrosion
• Reliability under all operating conditions
• Neoprene feet prevent microphone slipping

Specifications:

• Type: Dynamic
• Frequency Response: 150 to 6,000 Hz
• Polar Pattern: Omnidirectional
• Impedance (at 1,000 Hz): Microphone rating impedance is 150 ohms (220 ohms actual) for connection to microphone inputs rated at 75 to 300 ohms
• Output Level (at 1,000 Hz): Open Circuit Voltage: -54.0 dB/Pa (2.0mV)(1 Pa = 94 dB SPL)
• Switch: Press-to-Talk Switch actuates microphone circuit and external relay or control circuit. Microphone circuit normally open.
• Cable: 2.1m (7 ft) four-conductor, two-conductor shielded, non-detachable
• Case: Brown ARMO-DURŪ with dull chrome-plated steel screen
• Net Weight: 836 grams (1 lb, 13-1/2 oz)
• Shipping Weight: 1.12 kilograms (2 lb, 7-1/2 oz)