Audio Technica U841A Omnidirectional condenser boundary microphone

The U841A delivers exceptionally intelligible audio reproduction in a super-compact, low-profile design. Equipped with UniGuard® RFI-shielding technology, this omnidirectional condenser boundary microphone is designed for clear, highly intelligible sound reinforcement, professional recording, television and conferencing in surface-mount applications. The U841A has a 360° pickup angle and operates on battery or phantom power.

• Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
• UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
• UniSteep® filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality
• Small-diameter UniPoint® capsule near boundary eliminates phase distortion and delivers clear, high-output performance
• Heavy die-cast case and silicon foam bottom pad minimize coupling of surface vibration to the microphone
• Low-profile design with low-reflectance black finish for minimum visibility
• Operates on battery or phantom power

• Element: Fixed-charge back plate permanently polarized condenser
• Polar Pattern: Omnidirectional in hemisphere above mounting surface
• Frequency Response: 30-20,000 Hz
• Low Frequency Roll Off: 80 Hz, 18 dB/octave
• Open Circuit Sensitivity: Phantom: -39 dB (11.2 mV) re 1V at 1 Pa Battery: -40 dB (10.0 mV) re 1V at 1 Pa
• Impedance: Phantom: 200 ohms Battery: 270 ohms
• Maximum Input Sound Level: Phantom: 132 dB, 1 kHz at 1% T.H.D. Battery: 122 dB SPL, 1 kHz at 1% T.H.D.
• Dynamic Range: Phantom: 111 dB, 1 kHz at Max SPL Battery: 101 dB, 1 kHz at Max SPL
• Signal to Noise Ratio: 73 dB, 1 kHz at 1 Pa
• Phantom Power Requiremens: 11-52V DC, 2 mA typical
• Battery Type: 1.5V AA/UM3
• Battery Current Life: 0.4 mA / 1200 hours typical (alkaline)
• Switch: Off, on-flat, on-roll-off
• Cable: 25.0' (7.6 m) long (permanently attached to microphone), 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F-type connector
• Accessories: AT8531 power module; battery; soft protective pouch

The e 912 is a pre-polarized condenser boundary microphone with
half-cardioid pick-up pattern. Its acoustic properties have been
optimized for instruments, vocals and speech. The e 912 is an ideal
choice for pianos, theatre and opera productions, conference applications,
altars and lecterns.To optimally match the installation environment,
the e 912 is available in black or creme white.

Features
Frequency response and sensitivity optimized for picking up instruments,
vocals and speech
Unobtrusive, flat housing
Extremely rugged and step-resistant
Shock-absorbing rubber base
Mounting slots for table installation
Gold-plated XLR connector
Integrated pre-amp 
Delivery Includes
e 912 Microphone
Pouch
User manual

Technical Data
Transducer principle (Microphone)  permanently polarized condenser 
Pick-up pattern  half-cardioid 
Sensitivity in free field, no load (1kHz)  10 mV/Pa 
Max. Sound pressure level (aktiv)  135,6 dB 
Equivalent noise level  26 dB(A) 
Phantom powering  48 V / 1,1 mA 
Nominal impedance  Min. terminating impedance  1000 Ohm 
Dimensions  126,5 x 105 x 26,5 mm 
Weight  ca. 550 g 
 

Designed to deliver easy, flexible control in conference and boardroom installations, the versatile U891Rx cardioid condenser boundary microphone features a touch-sensitive on-off switch that can be set to three modes: press-on/press-off, press to talk, and press to mute. The phantom-powered microphone is equipped with a unique PivotPoint® rotating output connector and an LED status indicator. UniGuard® innovations offer unsurpassed immunity from radio frequency interference; interchangeable elements are available in cardioid, hypercardioid and omnidirectional polar patterns; an 80 Hz low-cut UniSteep® filter reduces pickup of low-frequency ambient noise. The microphone's heavy die-cast case and silicon foam bottom pads minimize coupling of surface vibration to the microphone. The unit's self-contained electronics eliminate the need for an external power module.

• Designed for surface-mount applications such as high-quality sound reinforcement, professional recording, television, conferencing and other demanding sound pickup situations
• Ultra-quiet electronic switch can be set to any of three operating modes: "touch-on/ touch-off," "touch-to-talk" and "touch-to-mute“
• PivotPoint® rotating output connector allows cable to exit from either the rear or the bottom of the microphone
• Superior off-axis rejection for maximum gain before feedback
• UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
• Small-diameter UniPoint® capsule near boundary eliminates phase distortion and delivers clear, high-output performance
• Heavy die-cast case and non-slip silicon foam bottom pads minimize coupling of surface vibration to the microphone
• Low-profile design with low-reflectance finish for minimum visibility
• Available in two colors: black (U891Rx) and white (U891RWx)

• 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: 104 dB, 1 kHz at Max SPL
• Signal to Noise Ratio: 68 dB, 1 kHz at 1 Pa
• Phantom Power Requirements: 11-52V DC, 4 mA typical
• Weight: 264 g
• Dimensions: 108.0 mm long, 84.0 mm maximum width, 23.0 mm height
• Output Connector: TB3M-type
• Cable: 7.6 m long, 3.2 mm diameter, 2-conductor, shielded cable with TA3F and XLRM-type connectors

For micing upright and grand pianos on stage or in the studio. Additional applications in the area of conference technology, transmission of roundtable discussions and theatrical performances.

With its half-space unidirectional polar pattern, low-profile design, and outstanding sound quality, the PRO44 is ideal for conference tables, podiums, lecterns and other installed-sound uses. This versatile boundary mic\'s self-contained electronics eliminate the need for external power modules. The PRO44 is equipped with a wide-range condenser element with low-mass diaphragm for superior performance.

Low profile for minimum visibility
Wide-range condenser element with low-mass diaphragm for superior performance
Self-contained electronics eliminate need for external power modules
Rugged design and construction
25\' (7.6 m) detachable cable (TA3F to XLRM-type)

Element: Fixed-charge back plate, permanently polarized condenser
Polar Pattern: Half-cardioid (cardioid in hemisphere above mounting surface)
Frequency Response: 70-16,000 Hz
Open Circuit Sensitivity: -25 dB (56.2 mV) re 1V at 1 Pa
Impedance: 100 ohms
Maximum Input Sound Level: 114 dB SPL, 1 kHz at 1% T.H.D.
Dynamic Range: 86 dB, 1 kHz at Max SPL
Signal to Noise Ratio: 66 dB, 1 kHz at 1 Pa
Phantom Power Requiremens: 9-52V, 2 mA typical
Weight: 2.4 oz (67 g)
Dimensions: 2.87" (73.0 mm) maximum width, 3.56" (90.5 mm) maximum length, 0.59" (15.0 mm) height
Output Connector: TB3M-type
Cable: 25\' (7.6 m) long, with TA3F and XLRM-type connectors

With three cardioid condenser elements in a single housing, the phantom-powered U843R offers a remarkably versatile tool for surface-mount installations. Levers on the microphone base allow easy reorientation of two elements to offer 360° or 300° coverage. Since elements can be powered and used individually or in any combination, further flexibility is easily achieved. For example, with two elements powered, the microphone can provide a figure-of-eight polar pattern; with a single element powered, the microphone functions as a standard cardioid boundary microphone. Installation and repositioning are extremely quick, thanks to four recessed pathways on the base of the microphone that enable the user to route the cable as required to accommodate any installation requirements; no tools or disassembly are needed. The microphone also offers Audio-Technicaʼs innovative UniGuard® RFI-shielding technology.

• Three cardioid condenser elements mounted in a single housing
• Easily reposition two elements (via levers on the microphone base) to offer 360° or 300° coverage; each element can be powered and used individually or in any combination
• Also functions as a stereo boundary microphone
• Provides full, efficient and flexible coverage—fewer microphones required
• Small-diameter capsules near boundary eliminate phase distortion and deliver clear, high-output performance
• Low-frequency attenuation improves sound pickup without affecting voice quality
• Cable routes through any of four recessed pathways on the microphone base (or down for direct feed through a table surface); no tools or disassembly required
• UniGuard® RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)
• Heavy die-cast case and non-slip silicone foam bottom pad minimizes coupling of surface vibration to the microphone
• Low-profile design with low-reflectance finish for minimum visibility

• Element: Fixed-charge back plate, permanently polarized condenser
• Polar Pattern: Hemispherical Cardioid x3 (combine to omni-directional or bidirectional)
• Frequency Response: 70-16,000 Hz
• Open Circuit Sensitivity: –37 dB (14.1 mV) re 1V at 1 Pa
• Impedance: 100 ohms
• Maximum Input Sound Level: 134 dB SPL, 1 kHz at 1% T.H.D.
• Dynamic Range (Typical): 105 dB, 1 kHz at Max SPL
• Signal-to-Noise Ratio: 65 dB, 1 kHz at 1 Pa
• Phantom Power Requirements: 11-52V DC, 2 mA typical
• Switch: The lever of elements can adjust the proper position
• Weight (Less Cable): 160 g
• Dimensions: 20.0 mm - height
  85.0 mm – maximum body diameter
• Cable: 7.6 m long (permanently attached to microphone), 4 mm diameter, 6 conductor, shielded cable; output end stripped and tinned for connection to electronic device
• Accessories Furnished: Soft protective pouch