Audio-Technica U891RCX Manuel d'utilisateur télécharger pdf

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U891RCx

Cardioid Condenser Boundary Microphone with Local or Remote Switching

Features

• Activation switch can be set to any of three operating modes:

“press-on/press-off,” “press-to-talk” and “press-to-mute”

• External contact closure capability permits control of remote

devices from microphone switch

• External LED control allows for accurate depiction of the live

status of the microphone

• PivotPoint

rotating output connector allows cable to exit from

either the rear or the bottom of the microphone

• UniGuard

RFI-shielding technology offers outstanding rejection

of radio frequency interference (RFI)

• UniSteep

lter provides a steep low-frequency attenuation to

improve sound pickup without affecting voice quality

• Available interchangeable elements permit angle of acceptance

from 100° to 360°

• Heavy die-cast case and non-slip silicone foam bottom pads

minimize coupling of surface vibration to the microphone

Description

The U891RCx is a wide-range condenser microphone with a cardioid

polar pattern. It is designed for surface-mount applications such as high-

quality sound reinforcement, conferencing, distance learning and other

demanding sound pickup applications.

The microphone features an activation switch, a programmable external

contact closure and an LED indicator. The activation switch can be set to

any of three operating modes: “press-on/press-off,” “press-to-talk” and

“press-to-mute.” The microphone’s external contact closure capability

permits control of remote devices. The contact closure can also be

congured to operate independently of the microphone element for

applications that require a constant signal from the microphone element.

A switch on the bottom of the microphone allows selection of local or

remote operation. (In remote operation, the LED and activation switch

operate independently of the microphone.) A third position on this switch

enables the LED to be controlled from an external source.

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 (cardioid in hemisphere above mounting surface). Additional

interchangeable elements with omnidirectional (360°) and hypercardioid

(100°) pickup patterns are available.

The microphone includes a 7.6 m (25') output cable terminating in a

special TA5F-type connector at the microphone end. The equipment

end is stripped and tinned for connection to an electronic device. The

microphone is equipped with Audio-Technica’s unique PivotPoint

rotating

output connector.

A switch permits choice of at response or low-frequency roll-off (via

integral 80 Hz high-pass UniSteep

lter) to help control undesired

ambient noise.

The microphone’s heavy die-cast case and non-slip silicone foam

bottom pads minimize coupling of surface vibration to the microphone.

The microphone includes a soft protective pouch and features a low-

reectance black nish.

Installation and Operation

The U891RCx requires 11V to 52V phantom power for operation.

The electronics in the microphone take up to 30 seconds to stabilize after

power is applied; during this start-up period, some sonic disturbances may

be heard upon switching if the system is “live.”

The microphone should be placed on a at,

unobstructed mounting surface, with the front

of the microphone facing the sound source.

The sound source should not be below,

or higher than 60° above, the plane of the

mounting surface.

The microphone features an activation switch, indicator LED and external

contact closure ability for controlling remote devices. The microphone

offers three choices of switching modes. The SW. FUNCTION switch

located on the bottom of the microphone selects the desired mode.

TOUCH ON/OFF: Press the on/off switch once to turn the microphone

on; press again to turn off. MOM. ON (momentary on): Microphone

is on only while the switch is being pressed (“press to talk”). MOM.

OFF (momentary off): Microphone is off only while the switch is being

pressed (“press to mute”). The indicator LED and external contact closure

follow the operation of the activation switch when in the local mode.

For applications that require the microphone to remain active or always

“on”, regardless of the activation switch setting, a “Local/Remote/ LED

Remote” control function is provided.

• When the CONTROL switch (located on the bottom of the microphone)

is in the “Local” position, the activation switch controls the

microphone’s audio output, LED status and contact closure internally.

• When the CONTROL switch is in the “Remote” position, the

microphone’s audio output remains active or “on” all the time. The

activation switch controls only the LED and contact closure.

• When the CONTROL switch is in the “LED remote” position, it allows

remote control of the LED, for accurate depiction of the microphone’s

live status. The LED will remain “on” when driven logic high or open,

and “off” when driven logic low or connected to ground. The

microphone’s audio output remains active or “on” all the time, and the

contact closure follows the conguration of the activation switch.

*Refer to the table for switch/LED/closure states.

Output is low impedance balanced. The signal appears across the red and

yellow wires; audio ground is the shield connection. Output is phased so

that positive acoustic pressure produces positive voltage on the yellow

wire. The small-diameter black and blue wires are the contact closure. The

white wire is the external LED control.

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 pickup of low-frequency ambient noise (such as trafc, air-handling

systems, etc.), room reverberation and mechanically coupled vibrations. To

engage the UniSteep

lter, slide the switch toward the “bent” line.

The microphone’s PivotPoint

rotating output connector allows the cable

to exit from either the rear or the bottom of the microphone without the

need for tools or disassembly.

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.

60°

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Audio-Technica U891RCX Manuel d'utilisateur

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