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AT815ST
STEREO SHOTGUN MICROPHONE
• Designed for broadcasters, videographers and sound recordists
• Compact, lightweight design is perfect for camera-mount use
• Independent line-cardioid and figure-of-eight condenser elements
• Switchable low-frequency roll-off
• Switch selection of non-matrixed M-S mode and two internally-matrixed
left/right stereo modes
MID-SIDE OPERATION:
In M-S mode, the AT815ST provides
independent Mid and Side signals. This allows the Mid-Side balance to be
adjusted as desired at the recording desk or mixing electronics, reducing the
amount of equipment necessary in the field.
MATRIXED STEREO: The AT815ST offers two internally-matrixed modes
which provide traditional "left-right" stereo. To accommodate varying acoustic
environments, the user may select between a "wide" pattern (LR-W) with
increased ambient pickup, and a "narrow" pattern (LR-N) which offers more
rejection and less ambience. Output phase is "Pin 2 hot."
For correct left-right stereo orientation, position the microphone so the word
"UP" is on top, with the switches on the bottom. In all modes, locating the
AT815ST nearer the sound source enhances the apparent width of the stereo
image, while decreasing room ambience. Moving away from the sound source
will result in a narrower stereo image and more "room sound."
M-S Output
Connector
Mid
XLR3M-Gray
XLR5M Mic Connector:
Side
XLR3M-Red
XLR5M Mic Connector:
Matrix Output
Connector
Left
XLR3M-Gray
XLR5M Mic Connector:
Right
XLR3M-Red
XLR5M Mic Connector:
The AT815ST requires 11V to 52V DC phantom power on Pins 2 and 3
of both XLR3M connectors. Wiring must be balanced throughout, and all
mic cables in the system must be wired consistently: Pin 1-to-Pin 1, etc. If
connecting to unbalanced inputs, good-quality balanced line transformers
must be used.
The high sensitivity of the AT815ST assures useful output and an excellent
match to most inputs. However, the microphone's high output may overload
some sensitive electronic input stages under some conditions. Many
pre-amps and mixers include a mic pad or input attenuator control to prevent
overload; or, use an AT8202 attenuator or equal at the input.
Avoid leaving the microphone in the open sun or in areas where
temperatures exceed 110° F (43° C) for extended periods. Extremely high
humidity should also be avoided.
Pin 1
Pin 2
Pin 3
Ground
Mid +
Mid –
Pin 1
Pin 2
Pin 3
Ground
Side +
Side –
Pin 1
Pin 4
Pin 5
Pin 1
Pin 2
Pin 3
Ground
Mid +
Side –
Pin 1
Pin 2
Pin 3
Ground
Mid +
Side +
Pin 1
Pin 4
Pin 5
AT815ST SPECIFICATIONS
†
ELEMENTS
POLAR PATTERNS
FREQUENCY RESPONSE
LOW FREQUENCY ROLL-OFF
OPEN CIRCUIT SENSITIVITY
(Mid / Side / LR Stereo)
IMPEDANCE
MAXIMUM INPUT SOUND LEVEL
(Mid / Side / LR Stereo)
SIGNAL-TO-NOISE RATIO
1
(Mid / Side / LR Stereo)
DYNAMIC RANGE (typical)
(Mid / Side / LR Stereo)
PHANTOM POWER
REQUIREMENTS
SWITCHES
WEIGHT (less accessories)
DIMENSIONS
OUTPUT CONNECTOR
CABLE
ACCESSORIES FURNISHED
† 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 /cm
2
= 10 microbars = 94 dB SPL
1
Typical, A-weighted, using Audio Precision System One.
Specifications are subject to change without notice.
Mid
Polar Pattern
0
30
330
300
60
270
90
240
120
50
100
210
150
LEGEND
180
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
1 kHz
Side
LR Stereo-Wide (LR-W)
Polar Pattern
0
330
30
330
300
60
300
270
90
270
240
120
240
210
150
210
180
SCALE IS 5 DECIBELS PER DIVISION
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
LEGEND
LEFT
1 kHz
1 kHz
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P51655-01-EN
©2004 Audio-Technica U.S., Inc.
Fixed-charge back plate
permanently polarized
condenser
Line-cardioid and
figure-of-eight
30-20,000 Hz
80 Hz, 12 dB/octave
–30 dB (31.6 mV) /
–34 dB (19.9 mV) /
–36 dB (15.8 mV) re 1V at 1 Pa*
200 ohms
123 dB / 127 dB / 126 dB SPL,
1 kHz at 1% T.H.D.
72 dB / 68 dB / 70 dB SPL,
1 kHz at 1 Pa*
101 dB / 101 dB / 102 dB,
1 kHz at Max SPL
11-52V DC, 4 mA typical at 48V,
each channel
M-S, LR Stereo-Wide (LR-W),
LR Stereo-Narrow (LR-N);
Flat, roll-off
5.0 oz (142 g)
14.96" (380.0 mm) long,
0.83" (21.0 mm) diameter
Integral XLR5M-type
Dual 24" (0.61 m) shielded
two-conductor, terminated in
two XLR3M-type connectors
AT8405a stand clamp for
5
threaded stands; AT8135 foam
windscreen; protective
carrying case
Frequency Response
200
500
1k
2k
5k
10k
Frequency in Hertz
12" or more on axis (flat)
Roll-off
LR Stereo-Narrow (LR-N)
Polar Pattern
Polar Pattern
0
0
330
30
300
60
270
90
240
120
210
150
180
180
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
LEFT
RIGHT
RIGHT
1 kHz
1 kHz
Printed in Japan
/
"-27
8
10 dB
20k
30
60
90
120
150
1 kHz
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