unipoint
®
microphones
UniLine
®
Condenser Quick-Mount Gooseneck Microphones
U857QU & U857QLU
Features
• Quick-mount design with 3-pin XLRM-type connector insert at base
plugs into any standard XLRF-type surface or cable connector
• UniLine
®
polar pattern provides narrow 90º 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
• 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 U857QU is a wide-range condenser microphone with a UniLine
®
(line
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 flexible
positioning while maintaining a smooth, well-contoured appearance. The
U857QU stands 487.0 mm (19.17") from the table or podium; it is also
available in a 603.0 mm (23.74") version as U857QLU. The two models
are identical in all other respects.
The microphone requires 11V to 52V phantom power for operation.
The microphone is equipped with UniGuard
®
RFI-shielding technology,
which offers outstanding rejection of radio frequency interference (RFI).
The microphone's UniLine
®
(line cardioid) polar pattern provides a
90° angle of acceptance. Additional interchangeable elements with
omnidirectional (360°), cardioid (120°) and hypercardioid (100°) 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 flat response or low-frequency roll-
off (via integral 80 Hz high-pass UniSteep
®
filter) to help control undesired
ambient noise.
The microphone comes equipped with a two-stage foam windscreen
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-reflectance black finish.
Installation and Operation
The U857QU 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.
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
®
filter provides easy 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. To engage the UniSteep
®
filter, 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 flange, 71.0 mm (2.79") diameter
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 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.
drawing not actual size
FRONT
C
3 x 120°
A
B
