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U857QU / U857QLU
• Self-contained electronics eliminate need for external power
module
• Accepts interchangeable elements to permit angle of
acceptance from 90° to 360°
• Two-stage foam windscreen yields dramatically improved
resistance to P-pops and other breath blasts
• Quick-mount design with 3-pin XLRM-type connector insert at
base plugs into any standard XLRF-type surface or cable
connector
• Included shock mount attenuates noise, shock and vibration
transmitted through the mounting surface
The U857QU stands 19.17" (487.0 mm) from the table or podium; it
is also available in a 23.74" (603.0 mm) version as U857QLU. The
two models are identical in all other respects.
The U857QU requires 11V to 52V 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.
An integral 80 Hz high-pass UniSteep
switching from a flat frequency response to a low-end roll-off. The
roll-off 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
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.
UNILINE
™
GOOSENECK MICROPHONES
• Designed for high-quality
sound reinforcement,
professional recording and
broadcasting
• UniLine
™
polar pattern
provides narrow 90°
acceptance angle
• Superior off-axis rejection for
maximum gain before
feedback
• UniGuard
™
RFI-shielding
technology offers outstanding
rejection of radio frequency
interference (RFI)
• Easy-to-adjust, rugged,
small-diameter, alternating
gooseneck with virtually no
"memory" permits quick
positioning into desired shape
• UniSteep
®
filter provides a
steep low-frequency
attenuation to improve sound
pickup without affecting voice
quality
®
filter provides easy
CONDENSER QUICK-MOUNT
U857QU / U857QLU SPECIFICATIONS
ELEMENT
POLAR PATTERN
FREQUENCY RESPONSE
LOW FREQUENCY ROLL-OFF
OPEN CIRCUIT SENSITIVITY
IMPEDANCE
MAXIMUM INPUT SOUND LEVEL
DYNAMIC RANGE (typical)
SIGNAL-TO-NOISE RATIO
PHANTOM POWER REQUIREMENTS 11-52V DC, 2 mA typical
SWITCH
WEIGHT
U857QU
U857QLU
DIMENSIONS
U857QU
U857QLU
BOTH
OUTPUT CONNECTOR
OPTIONAL INTERCHANGEABLE
ELEMENTS
ACCESSORIES FURNISHED
† 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.
Polar Pattern
LEGEND
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
Shock Mount Installation
AT8662 mounting dimensions
A.
1
/
" (1.5 mm) pilot
16
holes 3 places on
2.29" (58.2 mm) circle.
B. 2.0" (51.0 mm)
through-hole for mount
clearance
C. Outside edge of
flange, 2.79"
(71.0 mm) diameter
Drawing not actual size.
1. Find the center of the mounting location and mark it. Allow
enough clearance to accommodate the shock mount's flange
on the surface and make cer tain there are no physical
obstructions below the desired location.
2. Using 2.0" (51.0 mm) hole saw, drill the large through-hole for
the shock mount.
3. Set the shock mount into the hole and mark the location of the
three mounting screw holes. Make certain to "center" the
mount in the large hole before marking the three small
mounting screw locations.
4. Using a
1
/
" (1.5 mm) drill bit, drill three pilot holes for the
16
mounting screws.
5. After installing the microphone, assure maximum shock
mounting effectiveness by providing some slack in the
connecting cable.
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P51692
©2005 Audio-Technica U.S., Inc.
†
Fixed-charge back plate
permanently polarized condenser
Line Cardioid
30-20,000 Hz
80 Hz, 18 dB/octave
–35 dB (17.7 mV) re 1V at 1 Pa*
250 ohms
135 dB SPL, 1 kHz at 1% T.H.D.
115 dB, 1 kHz at Max SPL
1
74 dB, 1 kHz at 1 Pa*
Flat, roll-off
5.7 oz (161 g)
5.9 oz (167 g)
19.17" (487.0 mm) long
23.74" (603.0 mm) long
0.48" (12.2 mm) head diameter,
0.74 (18.9 mm) base diameter
Integral 3-pin XLRM-type
UE-C cardioid (120°);
UE-H hypercardioid (100°);
UE-O omnidirectional (360°)
AT8154 two-stage foam
windscreen; AT8662 shock mount
Frequency Response
Frequency in Hertz
12" or more on axis
Roll-off
Printed in U.S.A.
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