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Boundary Microphones and Automatic Mic Mixers Technology Showcase

Aug 29, 2011 2:39 PM, by Bennett Liles


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AKG CBL 99

AKG CBL 99

Boundary, or pressure zone, microphones are seeing a rapid expansion in use with the spreading deployment of various conferencing applications. Classrooms, conference rooms, and mobile meeting AV packages have brought about new models and features in this type of microphone.

The CBL 99 boundary mic from AKG is equipped with three screw holes for permanent, secure mounting, and it features a switchable 150Hz bass-cut filter to limit the transfer of mechanical bumps and thumps from the mounting surface. Only 0.2in. thick, the matte black disk provides an omnidirectional pattern it operates on 9V-52V phantom power. Optional accessories include a battery-operated power supply and a phantom power adapter cable.

Astatic Commerical Audio Products 220VP

Astatic Commerical Audio Products 220VP

The 220VP boundary mic is part of the 2220VP microphone system from Astatic Commercial Audio Products, and it provides continuously variable polar pattern control by way of a two-conductor shielded cable from the mic head to a DSP unit. Mounted in a 15/16in. hole, the mic is designed to resist interference from cell phones, two-way radios, and other RF devices while the shock-absorbing bushings allow installation in surfaces up to 3in. thick. The unit has a maximum SPL rating of 120dB and is available in either matte black or white.

Audio-Technica es945

Audio-Technica es945

Audio-Technica designed the es945 boundary mic for omnidirectional pickup in permanent surface-mount applications for ceilings, tabletops, and wall panels. Equipped with UniGuard RFI-shielding technology, the unit is available in a white or black case. It runs on 11V-52V phantom power and features a die-cast case and a two-layer steel mesh grille. The microphone offers a frequency response of 40Hz to 18kHz, a dynamic range of 112dB, and can handle sound pressure levels up to 142dB.

Audix M60

Audix M60

Featuring superior RF immunity in a very heavy-duty shock resistant design, the new M60 boundary microphone from Audix provides fully integrated low-noise circuitry and a balanced signal at the mic source. The mic is optimized for voice response with a hemi-cardioid directional pattern, and the cable can be attached either on the bottom or on the edge opposite the pickup element. The unit is available in black, white, or nickel.

Beyerdynamic MPC 67

Beyerdynamic MPC 67

The MPC 67 boundary mic from Beyerdynamic features a half-cardioid polar pattern and a switchable frequency response along with an 8-bit micro controller that provides a number of functions. The unit can be operated with the push of its noiseless film button in three modes, on/off, push-to-talk, and push-to-mute. The frequency response can be set for linear, 80Hz roll off or 180Hz roll off. The top-mounted LED indicates when the mic is on.

Clockaudio CRM100-RF

Clockaudio CRM100-RF

In its retracted position, the Clockaudio CRM100-RF omnidirectional condenser mic appears almost like a coin lying on the conference table, but when it is pressed and raised, the microphone offers a built-in RF filter, balanced audio output, and 30Hz to 20kHz frequency response. Operating on 9V-48V phantom power and designed for remote switching, the mic is available in either black or nickel finish and includes a 6.5ft. low-impedance cable.

Consisting of a central black rubber disc surrounded by a stainless steel case, the BLM4060 boundary mic from DPA Microphones can be customized with a number of adapters and operates on 48V phantom power. The microphone comes with a black 10ft. power cord and the omnidirectional pickup pattern allows a 6dB gain of direct sound with only 3dB gain of diffuse sound. The unit can handle up to 134dB sound pressure levels before clipping and rises only 0.5in. above the surface on which it is placed.



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