222 HARTREY AVE.. EVANSTON.
IL.
60204 U.S.A.
8
MODELS 419A AND 419B
MICROPHONES
AND
ELECTRONIC
COMPONENTS
AREA CODE 3121866-2200
-
CABLE: SHUREMICRO
TWX: 910-231-0048 TELEX: 72-4381
I
CONTROLLED MAGNETIC@NOISE-CANCELING COMMUNICATIONS MICROPHONES
NOISE CANCELLATION
The important characteristics contributing to noise
cancellation and clear speech transmision in the
Model 419 Series are shaped frequency response, di-
rectionality, and distance discrimination.
Shaped Frequency Response: The acoustical ele-
ments are arranged to optimize performance in the
critical voice frequency range of 200 to 4,000 Hz. The
result is the reduction in pickup of sounds outside the
desired frequency range and proper control of those
sounds within the desired range.
Directionality: Through their inherent directional
properties, the Model 419 Series reject sounds that
do not originate from the front of the microphone.
This reduces pickup of off-axis sounds extraneous to
the user's voice.
GENERAL Distance Discrimination: The Model 419 Series dis-
The
Shure
Model
419 series
RANGER
2
co~-
criminate against sounds arriving from a distance in
TROLLED
MAGNETIC@
noise-canceling microphones favor of sounds from a near source. The microphones
are designed especially for use where surrounding Operate on the pressure gradient principle. Two sound
high noise levels make intelligible transmission a prob- entry ports spaced a small distance apart produce,
lem.
~h~
microp~ones
provide
clear,
crisp, natural by means of phase cancellation, reduction of sensiti-
voice response in even the noisiest surroundings. vity all distant
These small, rugged, hand-held CONTROLLED MAG- OPERATION
NETlC microphones are available in two versions: the In order to obtain the best noise-canceling perform-
high-impedance 419A and the low-impedance 419B. ance with the Model 419 Series, "close-talking" is
The Model 419 Series noise-canceling microphones required. The lips must be as close as possible to the
represent a significant improvement over most microphone grille (directlyfacing the grille and pressed
phones with anti-noise features. Noise cancellation in against the rubber lip guard).
F~~
greatest discrimi-
the 419 Series is provided through the combination nation between voice sounds and background noise,
of highly directional operation and superior discrimi- do not hold the microphone more than
25
mm
(1 in,)
nation against noise from distant sources over an
from
the mouth.
unusually wide frequency range. The 419 Series are No special precautions beyond ordinary care are
equally well suited for mobile or fixed station
use
necessary in operating the Model 419A and 419B. They
where wind, traffic, and engine noise or machinery, will function very satisfactorily under most conditions
vibration, and ventilation noise may interfere with of humidity and temperature. Dropping the microphone
speech transmision. or other similar severe mechanical shocks should be
With greater clarity and improved reliability and avoided.
durability, the microphones are available as either the CONNECTIONS
419A for connection to high-impedance microphone The internal connections of Models 419A and 4198
inputs or the 4198 for connection to low-impedance are shown in ~i~~~~
1.
microphone inputs.
The 419 Series microphones fit naturally and com-
fortably in the hand, and are not affected by heat or
humidity. The exclusive ARMO-DUR@case is immune
rosion-and is outstanding in its ability to resist me-
to oil, grease, fumes, salt spray, sun, rust, and cor-
chanical shocks and vibration. The "Million-Cycle"
WHITE
WHITE
d
-
-
-
-
.
.
-
----. .
T-
leaf-type switch is designed to withstand rigorous
,L~-
-
.
..
operating conditions and constant use.
MODEL
419~
MODEL
4198
INTERNAL
CONNECTIONS
Microphone Features: FIGURE
1
Highly intelligible speech response In both models, the RED and BLACK cable leads
Extremely effective noise cancellation control an external relay or switching circuit.
Available as either high-impedance or low-imped- In the high-impedance Model 419A, the WHITE
ance model cable lead is the "hot" conductor for the audio input
Sturdy and reliable CONTROLLED MAGNETIC circuit; the shield is connected to the amplifier or
cartridge chassis ground.
Unparalleled ruggedness and durability In the low-impedance Model 4198, the GREEN and
Tough ARMO-DUR case WHITE leads are the "hot" conductors for connection
Mounting bracket supplied-fits hang-up button to a balanced line audio input circuit; the shield is
on back of microphone connected to the amplifier or chassis ground.
Copyright
1980,
Shure
Brothers
Inc.
27A306
(TB)
Printed
in
U.S.A.
