The Astatic Model 631L is a noise cancelling dynamic microphone designed for close talking, hand held applications in quality sound installations where background noise is a problem. The frequency response, especially tailored for voice communications, provides a crisp, clear, highly intelligible sound with 360 degrees minimization of background noise. A soft lip guard is positioned to assure proper close talk voice spacing by the operator. The Model 631L, with modern "tear drop" styling, offers extreme reliability, convenient handling, rugged construction and high performance for years of dependable service.
The dynamic cartridge has a rugged polyester diaphragm which resists moisture, temperature extremes, most acids, alkalies and solvents. Molded in high impact Cycolac, the Model 631L comes with a permanently attached, heavy duty, four conductor, two shielded, coil cord. The 631L has a simple to operate DPDT long life, trouble free switch. The Model 631L has a low impedance output and is factory wired normally open. The Model 631L may be rewired in the field if a line shorting function is desired.