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U857Q & U857QL
Cardioid Condenser Quick-Mount Gooseneck Microphones
and a shock mount designed to attenuate noise, shock and vibration
transmitted through the mounting surface. The microphone is enclosed in
a rugged housing with a low-reectance black nish.
Installation and Operation
The U857Q requires 11V to 52V phantom power for operation.
Output 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.
The microphone can be mounted in a permanent installation (on a
lectern, pulpit, conference table or similar surface) with the included
AT8662 shock mount. The AT8662 effectively isolates the microphone
from noise, shock and vibration transmitted through the mounting
surface and eliminates pickup of low-frequency resonances caused by
mechanical coupling.
unipoint® microphones
Features
• Quick-mount design with 3-pin XLRM-type connector insert at base
plugs into any standard XLRF-type surface or cable connector
• Low-prole element provides uniform cardioid polar pattern with
120º 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® lter provides a steep low-frequency attenuation
to improve sound pickup without affecting voice quality
• Available interchangeable elements permit angle of acceptance
from 90° to 360°
• Included shock mount attenuates noise, shock and vibration
transmitted through the mounting surface
Description
The U857Q is a wide-range condenser microphone with a cardioid polar
pattern. It is designed for quality sound reinforcement, professional
recording, television and other demanding sound pickup applications.
The small-diameter double gooseneck design permits highly exible
positioning while maintaining a smooth, well-contoured appearance. The
U857Q stands 365.0 mm (14.37") from the table or podium; it is also
available in a 481.0 mm (18.94") version as U857QL. The two models are
identical in all other respects.
The microphone requires 11V to 52V phantom power for operation.
The provided two-stage foam windscreen simply slips over the head of
the microphone, effectively reducing wind noise or popping.
An integral 80 Hz high-pass UniSteep® lter provides easy switching
from a at 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 trafc,
air-handling systems, etc.), room reverberation and mechanically coupled
vibrations. To engage the UniSteep® lter, use the end tip of a paperclip
or other small pointed instrument to slide the switch toward the “bent” line.
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.
AT8662 Shock Mount Installation Instructions
Mounting Dimensions
A. 1.5 mm (1/16") pilot holes 3 places on 58.2 mm (2.29") circle.
B. 51.0 mm (2.0") through-hole for mount clearance
C. Outside edge of ange, 71.0 mm (2.79") diameter
3 x 120°
A
drawing not actual size
The microphone is equipped with UniGuard® RFI-shielding technology,
which offers outstanding rejection of radio frequency interference (RFI).
The microphone's cardioid polar pattern provides a 120° angle of
acceptance. Additional interchangeable elements with omnidirectional
(360°), hypercardioid (100°) and UniLine® (90°) pickup patterns are
available.
An XLRM-type connector insert at the base allows the microphone to be
plugged directly into an XLRF-type panel jack or microphone cable.
A recessed switch permits choice of at response or low-frequency rolloff (via integral 80 Hz high-pass UniSteep® lter) to help control undesired
ambient noise.
The microphone comes equipped with a two-stage foam windscreen
B
FRONT
1. Find the center of the mounting location and mark it. Allow enough
clearance to accommodate the shock mount's ange on the surface
and make certain there are no physical obstructions below the
desired location.
2. Using 51.0 mm (2.0") 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 1.5 mm (1/16") drill bit, drill three pilot holes for the mounting
screws.
5. After installing the microphone, assure maximum shock mounting
effectiveness by providing some slack in the connecting cable.
C
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12.2 mm
0.39"
10.0 mm
0.48"
18.55"
471.0 mm
18.94"
481.0 mm
18.9 mm
0.74"
277
U857Q & U857QL
Architect’s and Engineer’s Specications
The microphone shall be a xed-charge condenser designed for
permanent installation or portable applications. It shall have a cardioid
polar pattern with a uniform 120° angle of acceptance. and a frequency
response of 30 Hz to 20,000 Hz. It shall be capable of accepting
optional interchangeable elements for additional polar patterns. The
microphone shall operate from an external 11V to 52V DC phantom
power source. It shall be capable of handling sound input levels up to
139 dB with a dynamic range of 115 dB. Nominal open-circuit output
voltage shall be 11.2 mV at 1 V, 1 Pascal. Output shall be low impedance
balanced (250 ohms). It shall offer outstanding rejection of radio
frequency interference (RFI).
The microphone shall incorporate a self-contained power module with
an XLRM-type connector at the base for direct connection to a mating
XLRF-type panel jack or cable connector. It shall include a recessed switch
to permit choice of at response or 80 Hz low-frequency roll-off.
A microphone shock mount shall be supplied for installing the microphone
in a solid surface; it shall effectively isolate the microphone from noise,
shock and vibration transmitted through the mounting surface. A twostage foam windscreen shall also be included.
The microphone shall be a small-diameter alternating gooseneck design,
with an overall length of 365.0 mm (14.37") [481.0 mm (18.94")] and a
head diameter of 12.2 mm (0.48"). Weight shall be 144 grams (5.1 oz)
[150 grams (5.3 oz)]. Finish shall be low-reectance black.
The Audio-Technica U857Q [U857QL] is specied.
U857Q U857QL
0.39"
10.0 mm
0.39"
10.0 mm
Specications
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
Dimensions
Output connector
Optional interchangeable elements
Audio-Technica case style
Accessories furnished
In the intere st of standards develo pment, A.T.U.S. offers full
details on it s test methods to othe r industry
1 Pascal = 10 dynes/cm
1
Typical, A-weighted, using Audio Precision System One.
Specications are subject to change without notice.
professionals on request.
2
= 10 microba rs = 94 dB SPL
Switch
Weight
Fixed-charge back plate, permanently
polarized condenser
Cardioid
30-20,000 Hz
80 Hz, 18 dB/octave
–39 dB (11.2 mV) re 1V at 1 Pa
250 ohms
139 dB SPL, 1 kHz at 1% T.H.D.
115 dB, 1 kHz at Max SPL
1
70 dB, 1 kHz at 1 Pa
11-52V DC, 2 mA typical
Flat, roll-off
U857Q: 144 g (5.1 oz)
U857QL: 150 g (5.3 oz)
U857Q: 365.0 mm (14.37") long,
12.2 mm (0.48") head diameter,
18.9 mm (0.74") base diameter
U857QL: 481.0 mm (18.94") long,
12.2 mm (0.48") head diameter,
18.9 mm (0.74") base diameter
Integral 3-pin XLRM-type
UE-O omnidirectional (360°)
UE-H hypercardioid (100°)
UE-UL UniLine® (90°)
M34
AT8662 shock mount; AT8153 two-stage
foam windscreen
0.48"
12.2 mm
0.74"
18.9 mm
13.98"
355.0 mm
14.37"
365.0 mm
0.48"
12.2 mm
0.74"
18.9 mm
18.55"
471.0 mm
18.94"
481.0 mm
frequency response: 30–20,000 Hz
10 dB
100
12" or more on axis
Roll-off
330˚
200
Frequency in Hertz
0˚
180˚
500
30˚
150˚
5k
2k
1k
60˚
120˚
10k
90˚
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
50
LEGEND
polar pattern
300˚
270˚
240˚
210˚
SCALE IS 5 DECIBELS PER DIVISION
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
©2010 Audio-Technica U.S., Inc. audio-technica.com 0001-0128-01
Response in dB
20k