Boundary Microphones and Automatic Mic Mixers Technology Showcase
Aug 29, 2011 2:39 PM, by Bennett Liles
Presenting a choice of polar patterns including omnidirectional, cardioid, supercardioid, and figure-eight selected on a four-position rotary switch, the PC Boundary Satellite microphone from Electro-Voice goes wireless by fitting any current EV or Telex wireless body pack transmitter inside. The dual condenser, back electret element provides a frequency response of 50Hz to 20kHz and 130dB SPL figure. On the case is a membrane button for on/off, push-to-mute, or push-to-talk functions.
Intended for applications such as pickup on orchestras, choirs, stage performances, courtrooms, and conferences, the well-proven CBM 40X half-cardioid boundary microphone from Nady Systems includes a 16ft. mini-XLR-to-XLR cable and operates on 9V-52V phantom power. The die-cast metal alloy case can also be wrapped in a blanket and placed inside a kick drum, relying on its 130dB SPL capability. The Nady 48V SMPS-1X phantom power supply is available as an optional accessory.
Designed by Peavey for picking up stage performances, videoconferences, and other boundary mic applications, the PSM3 exhibits a half-cardioid pickup pattern with a frequency response of 50Hz to 20kHz, a dynamic range of 106dB, and a maximum SPL figure of 130dB. The mic has a black non-reflecting finish and sits on a shock-absorbing mounting pad. The low-impedance cable is detachable, and the back electret condenser element operates on a 9V-52VDC phantom power source.
The e912 pre-polarized half-cardioid boundary microphone from Sennheiser is intended for piano pickup, stage productions, conferences, podiums, and lecterns. It features a shock-absorbing rubber base, mounting slots for table installation, integrated pre-amp, and a gold-plated XLR connector. The unit runs on 48V phantom power and provides 20Hz to20kHz frequency response. The maximum SPL is 135.6dB, and the microphone is available in either black or white finish.
Offering unlimited movement and placement options, the MX690 wireless boundary microphone from Shure runs on two AA batteries and is compatible with Shure SLX wireless systems including the SLX4L receiver with logic output for applications requiring logic functionality. The transmitter is frequency agile, and the unit includes a bi-color status indicator, an IR link to the SLX receiver for automatic frequency synchronization, programmable mute function, and a battery level indicator. The mic provides 15Hz to17kHz frequency response, and it will operate for up to eight hours on alkaline batteries.
TOA Electronics equipped the EM-700 boundary mic with a 100Hz 12dB/oct low-cut filter switch on the bottom for best performance in environments with room rumble while the cardioid pickup pattern further reduces background noise. Running on 9V-52V phantom power, the microphone offers a 35Hz-20kHz frequency response with the low-cut filter off. The body is black die-cast aluminum with a rugged metallic punched net top screen. It is supplied with a 24ft. cable and XLR connector.
Automatic Microphone Mixers
These have been around for quite a while, but their new resurgence, like that of boundary mics, has been largely triggered by the take off of the conferencing market. At the same time, staff levels are thinning and everything automatic is getting a serious look.
Equipped by AKG Acoustics with an algorithm that includes NOM (number of microphones) attenuation, noise detection, and a noise-sensitive threshold function, the DMM 4/2/4 automatic microphone mixer provides four mic/line and two stereo aux inputs, switchable phantom power on each channel, and dbx compression/limiting. Each level knob has an incremental circular LED indicator and peak hold display. Each input also has low cut, LF shelving, and HF shelving filters. The mixer has a rear-panel RS-232 control port along with main stereo, recording, and headphone outputs.
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