The AT915QMRx/C is a wide-range
condenser microphone with a cardioid polar
pattern. It is designed for quality sound reinforce-
ment, professional recording, television, and
other demanding sound pickup applications. The
small-diameter alternating gooseneck design
permits highly flexible positioning while maintain-
ing a smooth, well-contoured appearance. Its
adjustable-length design allows for the ultimate
in positioning flexibility.
The microphone features an XLRM-type
connector insert at its base, allowing it to be
plugged directly into an XLRF-type panel jack or
microphone cable. The integral power module
can be powered from any external 9V to 52V DC
phantom power supply. A recessed switch in the
power module permits choice of flat response or
low-frequency roll-off to help control undesired
Four additional interchangeable elements
are available to permit selection of angle of
acceptance from 90 to 360 .
Audio-Technica design engineers have utilized
the newest low-mass diaphragm technology in the
quest for superior performance. The permanent
charge is now on the fixed back plate, rather than
the moving element. With A-T fixed-charge "back
plate" construction, a gold-vaporized diaphragm
just 2 microns thick (about .000079") can be used.
This considerably reduces moving mass, thus
improving frequency response and transient
response while reducing distortion.
The microphone is enclosed in a rugged
housing with a low-reflectance black finish.
Installation and Operation
Output is low impedance balanced. The output
connector mates with XLRF-type cable connectors.
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 microphone can be secured to a podium
or desktop with the included locking ring /isolator.
Rubber-insulated feet attenuate noise, shock and
vibration transmitted through the mounting surface.
A nylon compression bushing utilizes two set
screws to hold the microphone securely in place.
A template is provided on the back of this sheet
to aid in installation of the locking ring/isolator.
The provided foam windscreen simply slips
over the head of the microphone, effectively
reducing wind noise or "popping" when used
The small-diameter gooseneck is easy to
manipulate for proper positioning. Heavily lubri-
cated, it operates smoothly and quietly. Should
the unit become noisy with prolonged use, apply
a light machine oil directly on the gooseneck area
While a modern condenser microphone is
not unduly sensitive to the environment, tempera-
ture extremes can be harmful. Exposure to high
temperature can result in gradual and permanent
reduction of the output level. 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
The microphone shall be a fixed-charge
condenser with a cardioid polar pattern and a
frequency response of 40 Hz to 20,000 Hz. It shall
be capable of accepting optional interchangeable
elements for additional polar patterns. It shall
operate from an external 9V to 52V DC phantom
power source. Nominal open-circuit output voltage
shall be 7.0 mV at 1 kHz, 1 Pascal. Output shall
be low impedance balanced (200 ohms).
The microphone shall have a self-contained
power module with an XLRM-type connector insert
at the base for direct connection to a mating
XLRF-type panel jack or cable connector. The power
module shall include a switch for low-frequency
roll-off. A locking ring/isolator shall be supplied.
The microphone shall be a small-diameter
alternating gooseneck design, with an overall
length adjustable from 15.83" (402.0 mm) to 18.39"
(467.0 mm). Head diameter shall be 0.48" (12.2 mm).
The microphone weight shall be 4.2 oz (120 grams).
Finish shall be low-reflectance black.
The Audio-Technica AT915QMRx /C is
Frequency Response (Typical)
Frequency in Hertz
12" or more on axis (flat)