Technology Showcase: Wireless-microphone Systems
Jan 1, 2008 12:00 PM, By Bennett Liles
The latest professional options offer serious “broadcast” capability.
The 880iR classroom-amplification system from LightSpeed Technologies is an infrared entry that includes the LT-71 LightMic IR microphone/transmitteroperating on 2.06MHz/2.54MHz or 3.2MHz/3.7MHz with a frequency response from 40Hz to 20kHz (-3dB). The 880iR receiver has four audio inputs with PageFirst emergency-page priority, teacher-voice priority, graphic EQ, and individual loudspeaker switches and volume controls. The unit can either take its IR signal from an SR70F IR sensor, or it can work with the RedCAT all-in-one integrated IR sensor, amplifier, receiver, and loudspeaker. The LT-71 mic can be worn on a neck loop to retain a line-of-sight link with the IR sensor. The primary advantage of such systems is low-cost communication security.
The ACT-82 dual-channel digital-diversity receiver from Mipro offers digital transmission with 24-bit audio sampling, 128-bit encryption, and 110dBA dynamic range. The full-color vacuum fluorescent display shows selected frequency/channel, AF and RF levels, and battery condition. Large systems can be controlled and configured with the Mipro RCS2.Net software application. The receiver is used with the ACT-8H handheld microphone with a detachable lithium-polymer battery pack. The LCD shows channel, battery level, input level, and error code. A 4-hour charge can power the microphone for 8 to 10 hours. The ACT-8T body-pack transmitter has removable soft antennas and a mini-XLR mic connector.
Among the wide variety of wireless products from Nady Systems is the U-1000 wireless-microphone system with 120dB dynamic range and up to 500ft. line-of-sight range. The receiver uses tone squelch, and the backlit LCD shows channel/frequency and RF and AF levels, along with A/B antenna-diversity status. The RF-scan feature helps dodge any frequencies with interfering signals, and the rear panel includes balanced-XLR and unbalanced 1/4in. audio output connectors. The UH-1000 handheld microphone features interchangeable heads with dynamic or condenser types available. There is a power switch, mute control, low battery, and mute LED with an LCD display. The UB-1000 body-pack transmitter can handle microphones and instrument inputs with a level switch and all the same features as the UH-1000. The system is available for around $750.
The Pro Comm PCX U-1002 handheld wireless system from Peavey can operate on any of 100 channels for live voice and guitar reproduction. The system features automatic channel scanning to avoid interference and easy setup of the transmitter's channel-control system. The receiver has a color LCD display and XLR and 1/4in. audio output connectors. The MSRP on the Pro Comm PCX U-1002 system is $800.
Secure transmission is a prime feature of the Revolabs Solo Executive wireless-microphone system and the Solo Executive 8-channel system uses the company's MaxFlex technology to provide two-way audio, plus wideband transmission and encryption in wearable, handheld, and boundary-table microphones. There are muting options including local and remote control, and the systems may be linked for use with up to 16 microphones in multichannel audio mixers or teleconferencing units. The Revolabs Solo Executive 8-channel system retails for $5,995.
With its SWM7000, Sabine has left VHF/UHF, and it has gone up to the 2.4GHz band with 70 channels, built-in DSP, and flat audio response from 20Hz to 20kHz. In the handheld transmitter, the choice of dynamic or condenser is augmented by pushbutton selection of virtual capsules that provide the mic with a number of response personalities. The SW75-T belt-pack transmitter runs on regular or rechargeable batteries, and it provides a backlit, programmable LCD. The SWM7000 receiver incorporates a feedback exterminator, parametric filters, a compressor/limiter, and an active de-esser. A 2-channel receiver with two handheld mics runs around $1,700.
The new AirLine Synth diversity system, shipping in 2008 from Samson Technologies, is a new frequency-selectable system that can operate on any of 320 frequencies over U.S. and European bands with up to 11 simultaneous channels. Featuring automatic channel scanning, infrared programming, balanced and unbalanced outputs, and a front- and rear-mountable antenna, the AirLine Synth system can be rackmounted with up to four receivers in a single rack space. The front panel displays AF/RF levels, frequency, audio output level, and channel mix setting. The AG-300 guitar transmitter is a unique, dual-mount jack that works on Gibson- or Fender-style outputs. It contains a precision guitar preamp, a digital LCD channel readout, a low-battery indicator, an attenuation switch for active pickups, and a mute switch for hot swapping. For handhelds, the AX-300 plugs directly into all dynamic microphones and comes with a Samson Q7 mic. The transmitter contains a precision mic preamp, a digital LCD channel readout, a low-battery indicator, and a mute switch. The AL-300 features a spring-steel belt clip, with a mini-XLR locking audio connector, precision mic and instrument preamps, an attenuation switch, and a mute switch for hot swapping. All the transmitters provide 10 hours of operation on their respective AA batteries, and they also accept infrared channel loading via the receiver.
The Sennheiser EM3032 2-channel receiver can tune to 32 frequencies on each of its receiving units, and the LCD shows AF and RF levels, battery condition, frequency/channel, active antenna, and mute status. It also offers separate headphone outputs. The very compact SK-5212 body-pack transmitter has a red LED to indicate power, peak audio level, and low battery. The power button is hidden safely inside the case next to a handy multifunction switch used to navigate display menus and set frequencies and other parameters, including the lock mode and bass rolloff. The MSRP on the SK-5212 transmitter is $3,600, and $4,225 for the EM3032 receiver.
The Shure SLX wireless system almost completely automates frequency selection and setup. The SLX4 receiver scans the available bands, finds clear channels, and then syncs the transmitters to these frequencies through an IR link on the front panel. The LCD shows group, channel, frequency, lock/unlock status, and transmitter battery level. The handheld transmitter has a two-position level switch, and the body-pack unit has a three-position switch for microphones and instrument input levels. Both transmitters feature a timed backlit LCD and frequency/power lockout. The SLX4 receiver retails for around $350, the SLX1 body-pack is just less than $200, and the SLX2 handheld can be found for less than $250.
Sony has an on-camera wireless-mic solution in the URX-P1/6264 tuner, providing space-diversity reception on TV channels 62 through 64 with a shoe mount for ENG/EFP-camera attachment and two angle-adjustable, 1/4-wave antennas. Featuring tone squelch, the system can operate up to 16 transmitter/receiver pairs over a range of 188 frequencies. The -58dBm audio level is output on a three-pole mini jack, and it provides a 50Hz-to-15kHz typical audio frequency response. The unit is capable of being paired with Sony transmitters including the UTX-H1/6264 handheld unidirectional mic and the UTX-B1C/6264 body-pack transmitter with omni lavalier mic.
The Telex FMR-1000 can operate in a setup with up to 16 systems over 950 possible frequencies, with ClearScan to quickly find the best channels. The front panel includes a parametric equalizer with screwdriver-adjustable level, Q, and frequency settings. In addition to the group, channel, frequency, battery status, diversity operation, and AF/RF levels, the LCD also shows a custom label to identify the audio source. The keyed battery compartment ensures proper insertion. The HT-1000 handheld transmitter can use either dynamic or condenser heads. The receiver features a balanced-XLR audio output and an unbalanced output connector with its own level. The three-element set can be found for less than $750.
TOA Electronics is preparing for the release of its new Trantec S5.5 wireless system in the form of the S5.5-HD-A handheld and the S5.5-L-A lapel wireless mic. The receiver offers two-receiver section diversity with more than 1,000 selectable frequencies in 10 selectable bands of 24 channels. The receiver output level is mic/line switchable, and the front panel includes a headphone output. Up to 24 systems can be simultaneously monitored with a USB computer link, and frequency selection can be set into the mics from the receiver by an IR link.
The Zaxcom TRX-900 system features all-digital transmission in the UHF range with unique features including a built-in IFB receiver and an internal 6-hour digital recording capability (12-hour option) with optional timecode. The system is capable of operating up to 30 transmitters simultaneously. The transmitter runs for 5 hours on a single battery, and it offers RF remote control of the body-pack transmitter. The RX-900M (mono) and RX-900S (stereo) receivers have a 4-hour battery run time, mic and line audio input selects, and 24-bit D/A conversion. The RX-4900 is a four-receiver rackmount unit. The RX900M and RX-900S receivers list for around $2,000, and the TRX-900 transmitter is around $1,850.
Bennett Liles is a freelance television production engineer and AV technician in the Atlanta area. He specializes in government video production, distance learning, and videoconferencing.
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