Audio-Technica AT875R - Manual

Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P51977-01 ©2007 Audio-Technica U.S., Inc. Printed in Japan
SCALE IS 5 DECIBELS PER DIVISION
Polar Pattern
200 Hz
LEGEND
5 kHz
1 kHz
8 kHz
12" or more on axis LEGEND
Frequency in Hertz
Frequency Response
Response in dB
• Designed for video production and broadcast (ENG/EFP) audio
acquisition
• Extremely short length (under 7") ideal for use with compact
digital cameras
• Provides the narrow acceptance angle desirable for long-distance
sound pickup
• Excellent sound rejection from the sides and rear of mic
• Tailored response minimizes camera and handling noise
• Operates on phantom power only
The AT875R requires 11V to 52V DC phantom power for operation.
Output from the microphone’s XLRM-type connector is low
impedance (Lo-Z) balanced. The signal appears across Pins 2 and
3; Pin 1 is ground (shield). Output phase is “Pin 2 hot” –
positive acoustic pressure produces positive voltage at Pin 2.
To avoid phase cancellation and poor sound, all mic cables must
be wired consistently: Pin 1-to-Pin 1, etc.
The high sensitivity of the AT875R assures useful output and an
excellent match to most input sources. In some cases, however, an
attenuator such as the Audio-Technica AT8202 may be required
between the microphone and preamplifier to avoid overloading
sensitive input stages.
The microphone is RoHS compliant–free from all substances
specified in the EU directive on hazardous substances.
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.
AT875R SPECIFICATIONS †
ELEMENT Fixed-charge back plate
permanently polarized
condenser
POLAR PATTERN Line + gradient
FREQUENCY RESPONSE 90-20,000 Hz
OPEN CIRCUIT SENSITIVITY –30 dB (31.6 mV) re 1V at 1 Pa*
IMPEDANCE 100 ohms
MAXIMUM INPUT SOUND LEVEL 127 dB SPL, 1 kHz at 1% T.H.D.
DYNAMIC RANGE (typical) 107 dB, 1 kHz at Max SPL
SIGNAL-TO-NOISE RATIO 1 74 dB, 1 kHz at 1 Pa*
PHANTOM POWER 11-52V DC, 2 mA typical
REQUIREMENTS
WEIGHT (less accessories) 80 g (2.8 oz)
DIMENSIONS 175.0 mm (6.89") long,
21.0 mm (0.83") diameter
OUTPUT CONNECTOR Integral 3-pin XLRM-type
ACCESSORIES FURNISHED AT8405a stand clamp for 5 /
8
"-27
threaded stands; 5 /
8
"-27 to 3 /
8
"-16
threaded adapter; 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.
AT875R
LINE + GRADIENT CONDENSER MICROPHONE