
User Manual
UniLine™ Condenser Quick-mount Gooseneck Microphone U857QMU
■Features
■Notes on use
■Connection procedure
This product requires 48 V
DC phantom power.
Output terminals
PIN1 (ground)
PIN3
(cold)
PIN2 (hot)
■Specifications
Fixed-charge back plate, permanently polarized condenser
Line Cardioid (Unidirectional)
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% THD)
115 dB (1 kHz at Max SPL)
74 dB (1 kHz at 1 Pa)
11-52 V DC, 2 mA typical
Flat, roll-off
543.0 mm long
165 g
12.2 mm head diameter, 18.9 mm base diameter,
•1 Pascal = 10 dynes/cm2 = 10 microbars = 94 dB SPL
*Typical, A-weighted, using Audio Precision System One.
■Polarpattern
■Frequency response
■Dimensions
180°
150°
120°
90°
60°
30°
0°
330°
300°
270°
240°
210°
10 dB
1k 10k 100k10010
Audio-Technica Corporation
2-46-1 Nishi-naruse, Machida, Tokyo 194-8666, Japan
©2017 Audio-Technica Corporation
Global Support Contact: www.at-globalsupport.com
16-MAY-2019 Form No.ATGC-L0427-23
Response in dB
Frequency in Hertz
LEGEND
0°, 50cm
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
(Unit: mm)
Thank you for purchasing this product. Before using the product, read through
the user manual to ensure that you will use the product correctly.
Please keep this manual for future reference.
The U857QMU stands 543mm from the table or podium, and require 11V to 52V
phantom power for operation.
Avoid leaving the microphone in the open sun or in areas where temperatures
exceed 43°C for extended periods. Extremely high humidity should also be
avoided.
Connect the output terminals of the microphone to a device that has a
microphone input (balanced input) compatible with a phantom power supply.
The output connector is an XLRM-type with polarity as shown in the figure
below.
For product improvement, the product is sublect to modification without notice.
10
0
-10
-20
-30
20
• 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 technol-ogy 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
• Self-contained electronics eliminate need for external power module
• 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
• Optional shock mount attenuates noise, shock and vibration transmitted
through the mounting surface
■Safety precaution
■Cautions for the product
Although this product was designed to be used safely, failing to use it correctly
may result in an accident. To ensure safety, observe all warnings and cautions
while using the product.
• Do not subject the product to strong impact to avoid malfunction.
• Do not disassemble, modify or attempt to repair the product.
• Do not handle the product with wet hands to avoid electric shock or injury.
• Do not store the product under direct sunlight, near heating devices or in a hot,
humid or dusty place.
Integral 3-pin XLRM-type
Element
Polar pattern
Frequency response
Low Frequency response
Open circuit sensitivity
Impedance
Maximum input sound level
Dynamic range (typical)
Signal-to-noise ratio*
Phantom power requirements
Switch
Weight
Dimensions
Output connector
Included accessories AT8154 two-stage foam windscreen
Roll-off
132.0 411.0
18.9
12.2
543.0