550L Base Station Microphone

NOTE: The 550L has been discontinued.

(Discontinued) A low-impedance, dynamic base station mic designed to withstand rigorous operating conditions and use. Omnidirectional, Dynamic.

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.

• 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

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-DUR® with dull chrome-plated steel screen

 

Dimensions

See User Guide

 

Net Weight

836 grams (1 lb, 13-1/2 oz)

 

Shipping Weight

1.12 kilograms (2 lb, 7-1/2 oz)