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.
A low-impedance, dynamic base station mic designed to withstand rigorous operating conditions and constant use.
150 to 6,000 Hz
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)
Press-to-Talk Switch actuates microphone circuit and external relay or control circuit. Microphone circuit normally open
2.1m (7 ft) four-conductor, two-conductor shielded, non-detachable
Brown ARMO-DURŪ with dull chrome-plated steel screen
836 grams (1 lb, 13-1/2 oz)
1.12 kilograms (2 lb, 7-1/2 oz)