Shure 550L

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

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-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)