By: Shure
Microphones, Headphones & Wireless systems
Contact us for lowest price (800) 284-2288, (858) 565-1101,, or fax (858) 300-4193
“Close-Talk” Voice Communication Microphone
The Shure Specialty to General Communications Microphone Series 577B SONOBAR Microphone is a handheld dynamic microphone designed for communications and paging applications that require highly intelligible, low noise output. It can be used in all types of mobile communications, from amateur radio to helicopter news and traffic reports. It is also suitable for public address and paging systems in noisy areas such as factories, airport terminals, and restaurants.

The 577-B represents a significant improvement over most microphones with anti-noise features. Shaped frequency response, directionality, and distant sound discrimination contribute to total noise reduction. The microphone operates on the pressure-gradient principle and has two sound entry ports spaced a small distance apart. The modular design of the 577B greatly facilitates field servicing. The cartridge, switch, and cable can be replaced in a matter of minutes, if necessary.

The 577 B is built to withstand mechanical shocks, vibration, high temperatures, and humidity. The exclusive ARMO-DUR case is impervious to oil, grease, fumes, salt spray, sun, and corrosion. The “Million-Cycle” press-to-talk switch ensures years of reliable service. A mounting bracket is supplied to provide convenient hang-up when the microphone is not in use
Frequency response tailored for close-talk operation
Extremely effective noise cancellation
Dynamic microphone cartridge
Modular design
“Million-cycle” leaf-type press-to-talk switch
TRIPLE-FLEX cable provides three to four times the flex life of most coiled cords
Rugged ARMO-DUR case
Built-in hang-up button and supplied mounting bracket
Type Dynamic, noise-canceling
Frequency Response 100 to 5,000 Hz
Impedance (at 1000 Hz) Rated at 150 O (175 O actual) for connection to microphone inputs rated at 19 to 300 O
Output Level (at 1,000 Hz, 5/16 in.) Open Circuit Voltage-66.0 dBV/Pa (0.5 mV); 0 dB = 1 volt per 1 Pascal/94 dB SPL
Hum Sensitivity Equivalent to 32 dB SPL in 1 millioersted field
Operating Temperature Range -40° to 74° C (-40° to 165° F)
Switch Type Double-pole, single-throw, leaf-type, push-to-talk
Cable Non-detachable. 1.8 m (6 ft), neoprene-jacketed coil cord, four-conductor (two conductors shielded)
Case Two-tone gray, high-impact ARMO-DUR
Net Weight 330 grams (11.6 oz)
Certification Eligible to bear CE Marking. Conforms to European EMC Directive 89/336/EEC. Meets applicable tests and performance criteria in European Standard EN55103 (1996) parts 1 and 2, for residential (E1) and light industrial (E2) environments

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Prices and specifications subject to change without notice.