1 kHz
LEGEND
Mono (L+R)
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
90
60
120
30
150
210
240
270
300
330
180
0
LEGEND
Roll-off
12" or more on axis (flat)
Frequency in Hertz
Response in dB
10 dB
20k
10k
5k
2k
1k
500
200
100
50
Frequency Response
• Designed for broadcast and professional recording, and DAT
field use
• Pair of closely-matched cardioid elements provides the spatial
impact and realism of a live sound field
• Compact, lightweight design is perfect for camera-mount use
• Excellent channel separation
• Switchable low-frequency roll-off
• Operates on battery or phantom power
The AT825 requires 5-52V DC phantom power,
or
a 1.5V AA
battery for operation. A battery need not be in place for phantom
power operation.
Battery installation: Unscrew the upper section of the microphone
body to reveal the battery compartment. Insert a fresh 1.5V AA
battery in the handle compartment (“+” end up), then reassemble
the microphone. Alkaline batteries are recommended for longest
life. Remove the battery during long-term storage.
Output for each stereo channel is low impedance (Lo-Z) balanced.
The balanced signals appear across Pin 2 and 3 for the left
channel, Pins 4 and 5 for the right channel. Pin 1 is ground (shield)
for both channels. Output is “Pins 2 and 4 hot” – positive acoustic
pressure produces positive voltage at Pins 2 and 4.
Locating the AT825 nearer the sound source enhances the width of
the stereo image, while decreasing room ambience. Conversely, as
the mic position moves away from the sound source, a narrower
left/right stereo image results and more of the “room sound” is
noted.
The high sensitivity of the AT825 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.
AT825 SPECIFICATIONS
†
ELEMENTS
Fixed-charge back plate
permanently polarized
condenser
POLAR PATTERN
X/Y stereo
FREQUENCY RESPONSE
30-20,000 Hz
LOW-FREQUENCY ROLL-OFF
150 Hz, 6 dB/octave
OPEN CIRCUIT SENSITIVITY
–47 dB (4.4 mV) re 1V at 1 Pa*
CHANNEL BALANCE
≤
2.5 dB
IMPEDANCE
200 ohms balanced
MAXIMUM INPUT SOUND LEVEL
126 dB SPL, 1 kHz at 1% T.H.D.
SIGNAL-TO-NOISE RATIO
1
70 dB, 1 kHz at 1 Pa*
DYNAMIC RANGE
(typical)
102 dB, 1 kHz at Max SPL
PHANTOM POWER
5-52V DC, 2 mA typical
REQUIREMENTS
(each channel)
BATTERY TYPE
1.5V AA/UM3
BATTERY CURRENT / LIFE
2 mA / 1000 hours typical
(intermittent use)
(alkaline)
SWITCH
Flat, roll-off (recessed)
WEIGHT
(less cable and accessories)
8.5 oz (240 g)
DIMENSIONS
8.43" (214.0 mm) long,
2.44" (62.0 mm) head width,
0.83" (21.0 mm) body diameter
OUTPUT CONNECTOR
Integral 5-pin XLRM-type
CABLE
16.5' (5 m) long, 8 conductors
under two shields, vinyl-jacketed,
stereo cable with 5-pin XLRF-
type connector at microphone
end, two 3-pin XLRM-type
connectors at output end
ACCESSORIES FURNISHED
AT8405a stand clamp for
5
/
8
"-27
threaded stands; battery;
AT8120 windscreen; soft
protective pouch
†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.
Audio-Technica U.S., Inc.,
1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited,
Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P51657-EN ©2004 Audio-Technica U.S., Inc. Printed in Japan
AT825
ONEPOINT
®
X/Y STEREO FIELD RECORDING MICROPHONE
Five-pin XLRF-type Plug Wiring
5
4
3
2
1
PIN 1 – SHIELD LEFT & RIGHT
PIN 2 – YEL / YEL LEFT
PIN 3 – RED/RED LEFT
PIN 4 – YEL / YEL RIGHT
PIN 5 – RED/RED RIGHT
LEFT
1 kHz
LEGEND
1 kHz
RIGHT
SCALE IS 5 DECIBELS PER DIVISION
90
60
120
30
150
210
240
270
300
330
180
0
Stereo
Polar Pattern
