audio-technica-1 u857r Manuale Utente

 microphones

Cardioid Condenser Adapter-Mount Gooseneck Microphones

The U857R 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 flexible 
positioning while maintaining a smooth, well-contoured appearance. 
The U857R stands 305.0 mm (12.01") from the table or podium; it is also 
available in a 421.0 mm (16.58") version as U857RL. 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 cardioid polar pattern provides a 120° angle of 
acceptance. Additional interchangeable elements with omnidirectional 
(360°), hypercardioid (100°) and UniLine

®

 (90°) pickup patterns are 

available. 

The microphone includes a 3 m (9.8') permanently attached miniature 
cable. Its free end connects to the provided AT8538 power module via 
a special TA3F-type connector designed to optimize RFI immunity. The 
output of the power module is a 3-pin XLRM-type connector.   

A recessed switch in the power module 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 power module, a mounting 

flange, a cable pass-through adapter and a two-stage foam windscreen.  
The microphone is enclosed in a rugged housing with a low-reflectance 
black finish. 

The U857R 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 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.

Cable exit is from the bottom of the microphone. The included pass-
through adapter, designed for use with desk stands and microphone 
stands, provides a side-exit for the cable.

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. 

Note: Audio-Technica has developed a special RFI-shielding mechanism, 
which is an integral part of the connectors in the UniPoint

®

 line. If you 

remove or replace the connector, you may adversely affect the unit's 
RFI immunity.  Audio-Technica offers a crimp tool (ATCT) and RFI shields 
that enable you to shorten the cable and correctly reinstall the connector 
while maintaining the highest level of RFI immunity.

The microphone shall be a fixed-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 1V, 1 Pascal. Output shall be low impedance 
balanced (250 ohms). It shall offer outstanding rejection of radio 
frequency interference (RFI). 

The microphone shall have a 3 m (9.8') permanently attached miniature 
cable, terminating in a special TA3F-type output connector designed 
to optimize RFI immunity. The output connector shall connect to a 
TB3M-type jack on the included power module. The power module shall 
contain a recessed switch to permit choice of flat response or 80 Hz 
low-frequency roll-off. The output of the power module shall be a 3-pin 
XLRM-type connector.

A 

5

/

8

"-27 threaded flange shall be provided for permanent installation to a 

mounting surface. An included pass-through adapter shall provide a side-
exit for the cable. A two-stage foam windscreen shall also be included.

The microphone shall be a small-diameter alternating gooseneck design, 
with an overall length of 305.0 mm (12.01") [421.0 mm (16.58")] and a 
head diameter of 12.2 mm (0.48"). Weight shall be 124 grams (4.4 oz)