Architect’s and Engineer’s Specifications

U891RCx

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.

Note: Placing any object on a surface (such as a conference table) before its finish is fully cured may result in damage to the finish.

Architect’s and Engineer’s Specifications

The microphone shall be a fixed-charge condenser designed for use in surface-mount applications. It shall have a cardioid polar pattern with a uniform 120° angle of acceptance (cardioid in hemisphere above mounting surface) and a frequency response of 30 Hz to 20,000 Hz. It shall be capable of accepting optional interchangeable elements for additional polar patterns. It shall operate from an external 11V to 52V DC phantom power source. The microphone shall be capable of handling sound input levels up to 130 dB with a dynamic range of 104 dB. Nominal open-circuit output voltage shall be 19.9 mV at 1V, 1 Pascal. Output shall be low impedance balanced (200 ohms). It shall offer outstanding rejection of radio frequency interference (RFI).

The microphone shall feature an activation switch, an indicator LED and an external contact closure output for controlling remote devices. The microphone shall offer three choices of switching modes: press-on/press- off, momentary on, momentary off. A three-position “Local/Remote/LED Remote” control function switch shall be provided on the microphone.

The output of the microphone shall be a TB5M-type connector. A 7.6 m (25') miniature output cable with a TA5F-type connector at microphone end shall be supplied. The output end of the cable shall have stripped and tinned color-coded leads for connections. The microphone shall include a switch to permit choice of flat response or 80 Hz low-frequency roll-off.

The microphone shall have a maximum width of 84.0 mm (3.31"), a maximum length of 108.0 mm (4.25") and a maximum height of

23.0mm (0.91"). Weight shall be 266 grams (9.4 oz). The microphone shall be housed in a die-cast case with a perforated steel grille. Finish shall be low-reflectance black. The microphone shall include a soft protective pouch.

The Audio-Technica U891RCx is specified.

Switch Settings and Functions

CONTROL Switch in “Local” Position
SW Setting	Microphone Audio	LED	External Contact Closure
TOUCH ON/OFF	Follows activation	Follows activation	Follows activation
	switch	switch	switch
MOM. ON	“On” when switch	“On” when switch	Closed when switch
	is pressed	is pressed	is pressed
MOM. OFF	“Off” when switch	“Off” when switch	Open when switch
	is pressed	is pressed	is pressed
CONTROL Switch in “Remote” Position
SW Setting	Microphone Audio	LED	External Contact Closure
TOUCH ON/OFF	Always “On”	Follows activation	Follows activation
		switch	switch
MOM. ON	Always “On”	“On” when switch	Closed when switch
		is pressed	is pressed
MOM. OFF	Always “On”	“Off” when switch	Open when switch
		is pressed	is pressed
CONTROL Switch in “LED Remote” Position
SW Setting	Microphone Audio	LED	External Contact Closure
TOUCH ON/OFF	Always “On”	Remotely controlled	Follows activation
			switch
MOM. ON	Always “On”	Remotely controlled	Closed when switch
			is pressed
MOM. OFF	Always “On”	Remotely controlled	Open when switch
			is pressed

Specifications

Element	Fixed-charge back plate, permanently
	polarized condenser
Polar pattern	Half-cardioid (cardioid in hemisphere
	above mounting surface)
Frequency response	30-20,000 Hz
Low frequency roll-off	80 Hz, 18 dB/octave
Open circuit sensitivity	–34 dB (19.9 mV) re 1V at 1 Pa
Impedance	200 ohms
Maximum input sound level	130 dB SPL, 1 kHz at 1% T.H.D.
Dynamic range (typical)	104 dB, 1 kHz at Max SPL
Signal-to-noise ratio1	68 dB, 1 kHz at 1 Pa
Phantom power requirements	11-52V DC, 4 mA typical
Switches	Activation: on/off; Switch function: press
	on/off, momentary on, momentary off;
	Control: local, remote, LED remote; Flat,
	roll-off
Weight	266 g (9.4 oz)
Dimensions	108.0 mm (4.25") maximum length,
	84.0 mm (3.31") maximum width,
	23.0 mm (0.91") maximum height
Output connector	TB5M-type
Cable	7.6 m (25.0') long, 3.2 mm (0.13")
	diameter, 5-conductor shielded cable
	(2 conductors under shield; 3 control
	wires outside shield); TA5F-type
	connector at microphone end, output end
	stripped and tinned for connection to
	electronic device
Optional interchangeable elements	UE-O omnidirectional (360°)
	UE-H hypercardioid (100°)
Accessory furnished	Soft protective pouch

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/cm2 = 10 microbars = 94 dB SPL

1Typical, A-weighted, using Audio Precision System One. Specifications are subject to change without notice.

frequency response: 30–20,000 Hz

			in dB
			in dB
			Response
10 dB			Response

50	100	200	500	1k	2k	5k	10k	20k
			Frequency in Hertz
LEGEND		12" or more on axis
		Roll-off
polar pattern
	330˚	0˚	30˚
	330˚		30˚
300˚				60˚
270˚				90˚
240˚				120˚
240˚					LEGEND
					LEGEND
210˚			150˚			200 Hz
210˚		180˚	150˚			1 kHz
		180˚				5 kHz
SCALE IS 5 DECIBELS PER DIVISION						5 kHz
SCALE IS 5 DECIBELS PER DIVISION						8 kHz

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	0001-0268-00

U891RCX specifications

The Audio-Technica U891RCX is a professional-grade boundary microphone designed specifically for high-quality audio capture in various environments. This versatile microphone is ideal for use in conference rooms, auditoriums, theaters, and other applications where discreet and unobtrusive microphone placement is essential.

One of the standout features of the U891RCX is its low-profile design. Measuring just 25.4 mm in diameter and only 5.3 mm in height, it is easy to integrate into any setting without being visually intrusive. The microphone incorporates a durable metal construction, ensuring longevity and reliable performance in demanding environments.

The U891RCX utilizes a high-quality condenser capsule, which provides exceptional audio clarity and detail. With a frequency response that ranges from 20 Hz to 20 kHz, this microphone captures a wide range of audio frequencies, making it suitable for both vocal and instrumental applications. Additionally, the U891RCX features a cardioid pickup pattern, which helps to minimize background noise and focus on the sound source directly in front of the microphone, ensuring clean and clear recordings.

An impressive aspect of the U891RCX is its integrated switchable low-frequency roll-off filter. This feature effectively reduces low-end rumble and handling noise, resulting in a cleaner and more professional sound. The microphone also offers a 10 dB pad switch, which allows it to handle high sound pressure levels without distortion, making it great for capturing loud sound sources.

The U891RCX is equipped with a versatile connector system, making it compatible with various audio systems and setups. Its built-in XLR output facilitates easy connection to mixers, amplifiers, or recording devices.

Additionally, the microphone can be powered by standard phantom power, ensuring compatibility with a wide range of audio equipment. The U891RCX’s robust design, coupled with its advanced technology, ensures that it performs reliably in any professional audio environment.

In summary, the Audio-Technica U891RCX stands out for its high-quality audio capture, low-profile design, and robust features. With its durable build and cutting-edge technology, this microphone is an excellent choice for professionals seeking reliable and discreet audio solutions. Whether for live performances, recordings, or conference settings, the U891RCX delivers exceptional sound quality and versatility.