Description
The AT961R and AT961RP are wide-range
condenser microphones with unidirectional polar
patterns. They are designed for surface-mounted
applications such as high-quality sound reinforce-
ment, professional recording, television, and
teleconferencing.
Positioning a properly designed unidirectional
microphone centrally on a large, flat, unobstructed
surface yields several distinct advantages. The
directionality is increased by 3 dB, promoting
enhanced gain before feedback and further sup-
pression of ambient noise. Sensitivity is increased
for improved signal to noise ratio. Phase distortion
due to reflected sound energy from the boundary
itself is eliminated.
The AT961R and AT961RP require 9V to
52V DC phantom power for operation. A built-in
2-position switch allows selection of flat or low-
roll-off response. Enclosed in a rugged die-cast
case and protected by two layers of sturdy
perforated steel, each microphone has a field-
replaceable element and low-reflectance black
finish. The microphones are also available in white,
as AT961RW and AT961RWP. The combination
of heavy case and rubber non-slip bottom pad
minimizes mechanical coupling of surface
vibrations to the microphone.
The AT961R is supplied with a 25' (7.6 m)
output cable terminating in TA3F and
XLRM-type connectors.
The AT961RP has a 3-conductor (“stereo”)
1
/
4
" phone plug built into its underside, allowing
for quick and easy mounting and removal.
Installation and Operation
The symmetry and area of the mounting
surface directly affect the sensitivity of the
boundary microphone at low frequencies.
Ideally, the mounting surface should be circular;
however, square or rectangular surfaces are
most often used. If the mounting surface is
rectangular, the smaller dimension tends to
determine low-frequency cutoff. The microphone
should be centered on the surface and posi-
tioned with the front of the microphone facing
the sound source along the longer dimension of
the mounting surface. The sound source should
not be below, or higher than 60° above, the
plane of the mounting surface.
AT961R
The AT961R’s output is low imped-
ance balanced. The balanced signal appears
across Pins 2 and 3, while the ground (shield)
connection is Pin 1. Output is phased so that
positive acoustic pressure produces positive
voltage at Pin 2 in accordance with industry
convention.
The AT961R can be mounted to a flat
surface using two panhead screws in conjunc-
tion with the keyhole slots on the microphone’s
underside. Simply remove the small cut-out
section of the rubber pad to reveal the keyhole
slots and the low-frequency roll-off switch.
AT961RP
The AT961RP’s output is low imped-
ance balanced. The balanced signal appears
across the tip and ring of the
1
/
4
" plug, while the
ground connection is to the plug’s sleeve. Output
is phased so that positive acoustic pressure
produces positive voltage at the plug’s tip.
The AT961RP can be plugged directly into
a mating 3-conductor
1
/
4
" jack, which can be
installed in the mounting surface.
While a modern condenser microphone
is not unduly sensitive to the environment,
temperature extremes can be harmful. Avoid
leaving the microphone in the open sun or in
areas where temperatures exceed 110° F (43° C)
for long periods of time. Extremely high humidity
should also be avoided.
Architects and Engineers Specifications
AT961R [AT961RW]
The microphone shall be
a fixed-charge condenser with a unidirectional
polar pattern designed for use in surface-mount
boundary applications. The frequency response
shall be 30-20,000 Hz. The microphone shall
operate from an external 9V to 52V phantom
power source. Nominal open-circuit voltage
shall be 22.4 mV at 1 kHz , 1 Pascal. Output
shall be low impedance balanced (200 ohms).
The microphone shall include a switch for
low-frequency roll-off.
A 25' cable with TA3F to XLRM-type
connectors shall be supplied for connection
between the microphone and electronics input.
The microphone shall have a maximum width
of 2.87" (73.0 mm) and a maximum length of
3.59" (91.3 mm). Weight shall be 5.1 oz (145
grams). The microphone shall be housed in
a die-cast case with a two-layer perforated
steel grille. Finish shall be low-reflectance
black [white].
The Audio-Technica AT961R [AT961RW] is
specified.
AT961RP [AT961RWP]
The microphone shall
be a fixed-charge condenser with a unidirectional
polar pattern designed for use in surface-mount
boundary applications. The frequency response
shall be 30-20,000 Hz. The microphone shall
operate from an external 9V to 52V phantom
power source. Nominal open-circuit voltage
shall be 22.4 mV at 1 kHz , 1 Pascal. Output
shall be low impedance balanced (200 ohms).
The microphone shall include a switch for
low-frequency roll-off.
The microphone shall have a 3-conductor
1
/
4
"
plug mounted on the bottom at a right angle to
serve as an output connector.
The microphone shall have a maximum width
of 2.87" (73.0 mm) and a maximum length of
3.59" (91.3 mm). Weight shall be 5.2 oz (148
grams). The microphone shall be housed in a
die-cast case with a two-layer perforated steel
grille. Finish shall be low-reflectance black
[white].
The Audio-Technica AT961RP [AT961RWP]
is specified.
AT961R
AT961RP
Unidirectional
Condenser
Boundary
Microphones
60
°
IDEAL
WORKING
ANGLE
