Astatic 631L Users Manual

631L 631L

631l 591b07ed-06b9-48c9-892d-f1dd7985bb55 Astatic Microphone 631L User Guide |

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631L
Commercial Audio Products

DYNAMIC NOISE CANCELING
MICROPHONE

Description
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.

APPLICATIONS
The Astatic Model 631L, because of its' professional sound and rugged
construction and highly effective background noise reduction capabilities,
is an excellent choice for any application requiring a hand held, noise
cancelling microphones for difficult noise environments such as factories,
airports, restaurants, mills, etc. and for two-way communications in taxicabs,
buses, airplanes, helicopters, construction, police and fire vehicles, etc.

SPECIFICATIONS FOR 631L
Specifications
Element:
Dynamic noise cancelling

Frequency Response:
100 to 5000 Hz

Output Level:
-58 dB (0 dB = 1mw / 10 microbars)
-80 dB (0 dB = 1 volt / microbar)
1.0 mV/PA

Impedance:
200 ohms, matches 50 to 1000 ohms

Cable:
Four conductor, two shielded, permanently attached,
heavy duty, coil cord that extends to 1.8m (6 ft.)

Switch:
Operated by press-to-talk lever, DPDT long life, trouble free switch
with spring return, has smooth feel. Wired normally open

Housing:
Durable molded black Cycolac

Dimensions:
100mm (3-15/16") high x 75.4mm (2-3/32) wide x 66.7mm (2-5/8")
deep

Weight:
284 grams (10 oz.)

The model 631L may be rewired in the field. If a line-shorting function is
desired, remove the rear housing and add a jumper wire as indicated

TWO-YEAR LIMITED WARRANTY
Omnitronics, LLC. (“ASTATIC”) hereby warrants that this product will be free of defects in material and workmanship for a period of two years
from the date of purchase. In the unlikely event a defect occurs ASTATIC will, at its option, either repair or replace with a new unit of equal or
greater value. You should retain proof of purchase to validate the purchase date and return it with any warranty claim. Return warranty claims
carefully packed, insured and prepaid to the Service Department, 341 Harbor St. • Conneaut, OH 44030.
This warranty excludes exterior finish or appearance, damage from abuse, misuse of the product, use contrary to ASTATIC’s instructions or
unauthorized repair. All implied warranties or merchantability or fitness for a particular purpose are hereby disclaimed and ASTATIC hereby
disclaims liability for incidental, special or consequential damages resulting from the use or unavailability of this product.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state. Some states do not allow the
exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty lasts, so the above exclusions and
limitations may not apply to you.
Note: No other warranty, written or oral is authorized by Omnitronics, LLC

46873-26-00/Rev.1/8-5-04/S.W.



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