Audio Technica Engineered Sound At915Qmrx C Users Manual

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AT915QMRx/C
Cardioid
While a modern condenser microphone is
not unduly sensitive to the environment, temperature 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
specified.

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
extra close.
The small-diameter gooseneck is easy to
manipulate for proper positioning. Heavily lubricated, it operates smoothly and quietly. Should
the unit become noisy with prolonged use, apply
a light machine oil directly on the gooseneck area
affected.

Frequency Response (Typical)

10 dB

50

100

200

500

1k

Frequency in Hertz
LEGEND

12" or more on axis (flat)
Roll-off

2k

5k

10k

20k

Response in dB

Description
The AT915QMRx/C is a wide-range
condenser microphone with a cardioid polar
pattern. It is designed for quality sound reinforcement, professional recording, television, and
other demanding sound pickup applications. The
small-diameter alternating gooseneck design
permits highly flexible positioning while maintaining 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
ambient noise.
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.

Miniature
Condenser
Adjustablelength
Gooseneck
Quick-mount
Microphone

AT915QMRx/C
AT915QMRx/C Specifications†

Polar Pattern
Fixed-charge back plate
permanently polarized condenser
Cardioid (Unidirectional)
40-20,000 Hz
150 Hz, 6 dB/octave
– 43 dB (7.0 mV) re 1V at 1 Pa*
200 ohms
138 dB SPL, 1 kHz at 1% T.H.D.

Element
Polar Pattern
Frequency Response
Low-frequency Roll-off
Open Circuit Sensitivity
Impedance
Maximum Input Sound Level

111 dB, 1 kHz at Max SPL
67 dB, 1 kHz at 1 Pa*
Flat response, low-roll-off (recessed)
9-52V DC, 2 mA typical
4.2 oz (120 grams)
15.83" (402.0 mm) to 18.39" (467.0 mm) long,
0.48" (12.2 mm) head diameter,
0.83" (21.0 mm) base diameter
Integral 3-pin XLRM-type
AT8102 two-stage foam windscreen;
AT8616x locking ring/isolator;
element adapter (for C/H/O/SC elements)
AT853H-ELE hypercardioid (100°)
AT853ML-ELE MicroLine (90°)
AT853O-ELE omnidirectional (360°)
AT853SC-ELE subcardioid (170°)

Dynamic Range (Typical)
Signal-to-noise Ratio1
Switch
Phantom Power Requirements
Weight
Dimensions

Output Connector (Power Module)
Accessories Furnished

Optional Interchangeable
Elements

0

300

60

90

270

240

120

1

150

210
180

SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz

Dimensions

† In the interest of standards development, A.T.U.S. offers full details
on its test methods to other industry professionals on request.
* 1 Pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL

Mounting Template
(Actual Size)

30

330

0.48"
12.2 mm

Typical, A-weighted, using Audio Precision System One.

A

3x

120
˚

0.91"
23.0 mm

B

A. Drill 1/16" (1.5 mm) pilot holes
3 places on 11/2" (38 mm) circle
B. 11/8" (28.6 mm) thru-hole
for cable clearance
C. Outside edge of flange,
2.13" (54 mm) diameter

15.83"
402.0 mm
TO
18.39"
467.0 mm

C
FRONT

One -Year Limited Warranty
Audio -Technica microphones and accessories purchased in the U.S.A. are warranted for one year from date of
purchase by Audio-Technica U.S., Inc. (A.T.U.S.) to be free of defects in materials and workmanship. In event
of such defect, product will be repaired promptly without charge or, at our option, replaced with a new product
of equal or superior value if delivered to A.T.U.S. or an Authorized Service Center, prepaid, together with the
sales slip or other proof of purchase date. Prior approval from A.T.U.S. is required for return. This warranty
excludes defects due to normal wear, abuse, shipping damage, or failure to use product in accordance with
instructions. This warranty is void in the event of unauthorized repair or modification.

For return approval and shipping information, contact the Service Department, Audio-Technica U.S., Inc.,
1221 Commerce Drive, Stow, Ohio 44224.
Except to the extent precluded by applicable state law, A.T.U.S. will have no liability for any consequential,
incidental, or special damages; any warranty of merchantability or fitness for particular purpose
expires when this warranty expires.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.

3.16"
80.3 mm
0.83"
21.0 mm

Outside the U.S.A., please contact your local dealer for warranty details.

Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England

Form No. 0309-9504-00 -B/W P50884
© 1996 Audio-Technica U.S., Inc. Printed in U.S.A.



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