Audio Technica AT3527 User manual

Description
The AT3527 is a wide-range fixed-charge
condenser microphone with an omnidirec-
tional polar pattern. Featuring excellent
performance specifications, this versatile
microphone is designed to meet the needs
of professional musicians in a wide range of
applications, from project studio recording to
high-quality sound reinforcement. It is also
suitable for use in broadcasting and other
situations which demand exceptional audio
reproduction coupled with enduring reliability.
Audio-Technica design engineers have
utilized the newest low-mass technology in
the quest for superior performance. The back
plate of the AT3527 element holds a fixed
charge and has been aged to provide energy
stabilization. The surface of the back plate
has been precision-milled to ensure maximum
charge linearity. The result is a reduction in
both frequency response peaks and
diaphragm break-up distortion.
The Audio-Technica fixed-charge condenser
element design allows significant diaphragm
weight reduction. The low-mass diaphragm
improves transient response, increases
response bandwidth and reduces handling
and mechanical noise transfer.
The AT3527 is intended for use in professional
applications where remote power is available.
It requires 48V phantom power, which may be
provided by a mixer or console, or by a sepa-
rate, in-line source such as the Audio-Technica
AT8801 single-channel and CP8506 four-
channel phantom power supplies.
The omnidirectional (non-directional) polar
pattern of the AT3527 assures nearly equal
sound pickup from every direction across a
wide band of frequencies. This characteristic
is particularly useful when the microphone is
being used close to the sound source, or at
greater distances when acoustic conditions
are favorable.
A pressure transducer such as is used in the
AT3527 is inherently capable of flatter low-
frequency response than the multi-opening
transducers required in directional micro-
phones. Many knowledgeable engineers
prefer an omnidirectional microphone under
favorable acoustic conditions.
The AT3527 handles very high sound pres-
sure levels with ease, accepting as high as
148 dB SPL before producing 1% T.H.D. A
switchable 10 dB (nominal) pad is built-in,
increasing its capabilities to 158 dB SPL.
An integral 80 Hz hi-pass filter provides easy
switching from a flat frequency response to a
low-end roll-off. The hi-pass position reduces
the microphone’s sensitivity to popping in
close vocal use. It also reduces the pickup of
low-frequency ambient noise (such as traffic,
air-handling systems, etc.), room reverbera-
tion and mechanically-coupled vibrations.
The AT3527 is enclosed in a rugged housing
with a low-reflectance finish. Output is via a
3-pin professional connector. The included
AT8405 snap-in stand adapter permits
mounting on any microphone stand with 5/8"-27
threads.
Operation and Maintenance
Output is low impedance balanced. The
output connector mates with XLRF-type
cable connectors. The balanced signal
appears across Pins 2 and 3 while the ground
(shield) connection is Pin 1. Output is phased
so that positive acoustic pressure produces
positive voltage at Pin 2 in accordance with
industry convention.
For balanced low-impedance inputs, AT8314
cable (or equal) is recommended. An accom-
panying drawing shows the wiring used at
the equipment end of this cable. Note that
other manufacturers may employ other color
codes for cable conductors. Regardless of
color code, it is important that both ends of
each cable are wired consistently, with the
shield always connected to Pin 1, Pin 2 con-
nected to Pin 2, and Pin 3 to Pin 3. This will
ensure that all microphones are electrically in
phase and reduce problems of uneven
response and sound cancellation when two
microphones are used close to each other.
While a modern condenser microphone is
not unduly sensitive to the environment,
temperature extremes can be harmful.
Exposure to high temperatures can result in
gradual and permanent reduction of the out-
put level. Avoid leaving the microphone in
the open sun or in areas where temperatures
exceed 110˚ F (43˚ C) for long periods of time.
Extremely high humidity should also be
avoided.
AT3527
OMNIDIRECTIONAL
CONDENSER
MICROPHONE
Frequency Response
12" or more on axis
200
LEGEND
50 100 Frequency in Hertz
500 1k 2k 5k
Response in dB
20k
10k
10 dB
LEGEND Roll-off

AT3527 SPECIFICATIONS†
ELEMENT Fixed-charge back plate
permanently polarized condenser
POLAR PATTERN Omnidirectional
FREQUENCY RESPONSE 30-20,000 Hz
OPEN CIRCUIT SENSITIVITY –51 dB (2.8 mV) re 1V at 1 Pa*
IMPEDANCE 100 ohms
MAXIMUM INPUT SOUND LEVEL 148 dB SPL, 1 kHz at 1% T.H.D.
158 dB SPL, with 10 dB pad (nominal)
DYNAMIC RANGE (TYPICAL) 124 dB, 1 kHz at Max SPL
SIGNAL-TO-NOISE RATIO170 dB, 1 kHz at 1 Pa*
HI-PASS FILTER (LOW-END ROLL-OFF) 80 Hz, 12 dB/octave
POWER REQUIREMENTS 48V phantom (±4V), 4 mA typical
SWITCHES Flat response, hi-pass; 10 dB pad (nominal)
WEIGHT (LESS ACCESSORIES) 3.7 oz (105 grams)
DIMENSIONS 4.81" (122.3 mm) long,
0.83" (21.0 mm) maximum body diameter
OUTPUT CONNECTOR Integral 3-pin XLRM-type
ACCESSORIES FURNISHED AT8405 snap-in clamp for 5/8"-27 threaded stands;
foam 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/cm2= 10 microbars = 94 dB SPL
1Typical, A-weighted, using Audio Precision System One.
Optional Accessories:
•AT8314 2-conductor, shielded, vinyl-jacketed,
broadcast-type cable with XLRF-type connector
at microphone end, XLRM-type connector at
equipment end. Available in 10', 20', 25', 30',
50' and 100' lengths.
•AT8407 universal “clothes-pin” stand clamp
fits both tapered and cylindrical microphones.
• AT8410a shock mount for boom or stand
operation. Universal “clothes-pin” stand clamp
fits both tapered and cylindrical microphones.
• AT8415 low-profile shock mount for boom or
stand operation.
• CP8506 four-channel 48V phantom
power supply (AC powered).
• AT8801 single-channel 48V phantom power
supply (AC powered).
XLRM-Type Plug Wiring
Low Impedance Balanced
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
200 Hz
1 kHz
5 kHz
8 kHz
90°
60°
120°
30°
150°
210°
240°
270°
300°
330°
180°
0°
LEGEND
AT3527
One-Year Limited Warranty
Audio-Technica microphones and accessories purchased
in the U.S.A. are warranted for one year from date of
purchase by Audio-Technica U.S., Inc. (A.T.U.S.) to be
free of defects in materials and workmanship. In event of
such defect, product will be repaired promptly without
charge or, at our option, replaced with a new product of
equal or superior value if delivered to A.T.U.S. or an
Authorized Service Center, prepaid, together with the
sales slip or other proof of purchase date.
Prior approval
from A.T.U.S. is required for return.
This warranty
excludes defects due to normal wear, abuse, shipping
damage, or failure to use product in accordance with
instructions. This warranty is void in the event of unau-
thorized repair or modification.
For return approval and shipping information, con-
tact the Service Department, Audio-Technica U.S., Inc.,
1221 Commerce Drive, Stow, Ohio 44224.
Except to the extent precluded by applicable state law,
A.T.U.S. will have no liability for any consequential,
incidental, or special damages; any warranty of mer-
chantability or fitness for particular purpose expires
when this warranty expires.
This warranty gives you specific legal rights, and you
may have other rights which vary from state to state.
Outside the U.S.A., please contact your local dealer for
warranty details.
Form No. 0343-9802-00-B/W ©1998 Audio-Technica U.S., Inc. Printed in U.S.A.
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
Dimensions
4.81"
122.3 mm
0.74"
18.9 mm 0.83"
21.0 mm