1 kHz
400 Hz
200 Hz
LEGEND LEGEND
2 kHz
4 kHz
8 kHz
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
200100
50
Frequency Response
• Designed for critical long-distance pickup in broadcasting, film/TV
production, and theater sound reinforcement applications
•Direct-coupled, balanced output ensures a clean signal even in
high-output conditions
• Exclusive acoustic design provides same directivity as mics up to
50% longer (U.S. Patent No. 4,789,044)
•Rugged housing made of lightweight structural-grade aluminum
alloy
• Switchable low-frequency roll-off
The AT4071a is intended for use in professional applications where
remote power is available. It requires 11V to 52V DC phantom power,
which may be provided by a mixer or console, or by a
separate, in-line source such as the Audio-Technica AT8801
single-channel or CP8506 four-channel phantom power supplies.
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.
An integral 150 Hz high-pass filter provides easy switching from a flat
frequency response to a low-end roll-off. The roll-off position
reduces the pickup of low-frequency ambient noise (such
as traffic, air-handling systems, etc.), room reverberation and
mechanically coupled vibrations.
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.
AT4071a SPECIFICATIONS†
ELEMENT Externally polarized (DC bias)
condenser
POLAR PATTERN Line + gradient
FREQUENCY RESPONSE 30-20,000 Hz
LOW-FREQUENCY ROLL-OFF 150 Hz, 12 dB/octave
OPEN CIRCUIT SENSITIVITY1–21 dB (89.1 mV) re 1V at 1 Pa*
IMPEDANCE 100 ohms
MAXIMUM INPUT SOUND LEVEL 124 dB SPL, 1 kHz at 1% T.H.D.
NOISE212 dB SPL
DYNAMIC RANGE (typical) 112 dB, 1 kHz at Max SPL
SIGNAL-TO-NOISE RATIO282 dB, 1 kHz at 1 Pa*
PHANTOM POWER 11-52V DC, 3.2 mA typical
REQUIREMENTS
SWITCH Flat, roll-off
WEIGHT (less accessories) 5.5 oz (155 g)
DIMENSIONS 15.55" (395.0 mm) long,
0.83" (21.0 mm) body diameter
ACCESSORIES FURNISHED AT8405a stand clamp for 5/8"-27
threaded stands; AT8135
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
1Measured at diaphragm
2Typical, 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
P51663-EN ©2004 Audio-Technica U.S., Inc. Printed in Japan
AT4071a LINE + GRADIENT CONDENSER MICROPHONE
