• 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 Pin 1 Pin 2 Pin 3
Mid XLR3M-Gray Ground Mid + Mid –
XLR5M Mic Connector: Pin 1 Pin 2 Pin 3
Side XLR3M-Red Ground Side + Side –
XLR5M Mic Connector: Pin 1 Pin 4 Pin 5
Matrix Output Connector Pin 1 Pin 2 Pin 3
Left XLR3M-Gray Ground Mid + Side –
XLR5M Mic Connector: Pin 1 Pin 2 Pin 3
Right XLR3M-Red Ground Mid + Side +
XLR5M Mic Connector: Pin 1 Pin 4 Pin 5
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.
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. Printed in Japan
AT815ST STEREO SHOTGUN MICROPHONE
AT815ST SPECIFICATIONS†
ELEMENTS Fixed-charge back plate
permanently polarized
condenser
POLAR PATTERNS Line-cardioid and
figure-of-eight
FREQUENCY RESPONSE 30-20,000 Hz
LOW FREQUENCY ROLL-OFF 80 Hz, 12 dB/octave
OPEN CIRCUIT SENSITIVITY –30 dB (31.6 mV) /
(Mid / Side / LR Stereo) –34 dB (19.9 mV) /
–36 dB (15.8 mV) re 1V at 1 Pa*
IMPEDANCE 200 ohms
MAXIMUM INPUT SOUND LEVEL 123 dB / 127 dB / 126 dB SPL,
(Mid / Side / LR Stereo) 1 kHz at 1% T.H.D.
SIGNAL-TO-NOISE RATIO172 dB / 68 dB / 70 dB SPL,
(Mid / Side / LR Stereo) 1 kHz at 1 Pa*
DYNAMIC RANGE (typical) 101 dB / 101 dB / 102 dB,
(Mid / Side / LR Stereo) 1 kHz at Max SPL
PHANTOM POWER 11-52V DC, 4 mA typical at 48V,
REQUIREMENTS each channel
SWITCHES M-S, LR Stereo-Wide (LR-W),
LR Stereo-Narrow (LR-N);
Flat, roll-off
WEIGHT (less accessories) 5.0 oz (142 g)
DIMENSIONS 14.96" (380.0 mm) long,
0.83" (21.0 mm) diameter
OUTPUT CONNECTOR Integral XLR5M-type
CABLE Dual 24" (0.61 m) shielded
two-conductor, terminated in
two XLR3M-type connectors
ACCESSORIES FURNISHED AT8405a stand clamp for 5/8"-27
threaded stands; AT8135 foam
windscreen; protective
carrying case
†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
1Typical, A-weighted, using Audio Precision System One.
Specifications are subject to change without notice.
1 kHz
LEGEND
LR Stereo-Wide (LR-W)
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
90
60
120
30
150
210
240
270
300
330
180
0
LEFT
1 kHz
RIGHT
1 kHz
LEGEND
Side
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
90
60
120
30
150
210
240
270
300
330
180
0
1 kHz
LEGEND
Mid
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
90
60
120
30
150
210
240
270
300
330
180
0
1 kHz
LEGEND
LR Stereo-Narrow (LR-N)
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
90
60
120
30
150
210
240
270
300
330
180
0
LEFT
1 kHz
RIGHT
LEGEND
Roll-off
12" or more on axis (flat)
Frequency in Hertz
Response in dB
10 dB
20k
10k
5k
2k
1k
500
200100
50
Frequency Response
