Architect’s and Engineer’s Specifications
The microphone shall be a fixed-charge condenser designed for
permanent installation or portable applications. It shall have a UniLine
®
(line cardioid) polar pattern with a uniform 90° 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 135 dB with a dynamic range of 115 dB. Nominal open-
circuit output voltage shall be 17.7 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 flat 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 two-
stage foam windscreen shall also be included.
The microphone shall be a small-diameter alternating gooseneck design,
with an overall length of 487.0 mm (19.17") [603.0 mm (23.74")] and a
head diameter of 12.2 mm (0.48"). Weight shall be 161 grams (5.7 oz)
[167 grams (5.9 oz)]. Finish shall be low-reflectance black.
The Audio-Technica U857QU [U857QLU] is specified.
U857QU & U857QLU
132.0 mm
5.20"
355.0 mm
13.97"
18.9 mm
0.74"
12.2 mm
0.48"
19.17"
487.0 mm
132.0 mm
5.20"
23.74"
603.0 mm
12.2 mm
0.48"
18.54"
471.0 mm
0.74"
18.9 mm
132.0 mm
5.20"
355.0 mm
13.97"
18.9 mm
0.74"
12.2 mm
0.48"
19.17"
487.0 mm
132.0 mm
5.20"
23.74"
603.0 mm
12.2 mm
0.48"
18.54"
471.0 mm
0.74"
18.9 mm
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
0001-0129-01
Specifications
Fixed-charge back plate, permanently
polarized condenser
UniLine
®
(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
74 dB, 1 kHz at 1 Pa
11-52V DC, 2 mA typical
Flat, roll-off
U857QU: 161 g (5.7 oz)
U857QLU: 167 g (5.9 oz)
U857QU: 487.0 mm (19.17") long,
12.2 mm (0.48") head diameter,
18.9 mm (0.74") base diameter
U857QLU: 603.0 mm (23.74") 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-C cardioid (120°)
UE-H hypercardioid (100°)
M35
AT8662 shock mount; AT8154 two-stage
foam windscreen
Element
Polar pattern
Frequency response
Low frequency roll-off
Open circuit sensitivity
Impedance
Maximum input sound level
Dynamic range (typical)
Signal-to-noise ratio
1
Phantom power requirements
Switch
Weight
Dimensions
Output connector
Optional interchangeable elements
Audio-Technica case style
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.
U857QU
U857QLU
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
SCALE IS 5 DECIBELS PER DIVISION
240˚
180˚
210˚
270˚
300˚
330˚
0˚
150˚
120˚
90˚
30˚
60˚
12" or more on axis
LEGEND
Frequency in Hertz
Response in dB
10 dB
100
50
200
10k
5k
1k
500
2k
20k
Roll-off
frequency response: 30–20,000 Hz
polar pattern
279
