Infrared Wireless Microphone Systems
May 6, 2010 12:00 PM, By Bennett Liles
The Extron Electronics VoiceLift microphone is a classroom-amplification system that is designed to operate with Extron’s PoleVault audio switcher/amplifiers. It consists of the VLP 102 pendant mic, the VLR 102 receiver, the VLR 102 SR optional secondary receiver, and the system charging station. The VLP 102 mic, which can also be handheld, features a volume control, a power switch, an extra microphone input, and an additional auxiliary line input for sources such as MP3 players. The VLR 102 receiver includes the IR sensor, and it has RJ-45 connectors on the back for porting the audio signal to the PoleVault switcher and for connecting a secondary receiver. The rear panel of the receiver also has captive screw connections for RS-232 linked configuration, an auxiliary audio input connector, a contact-closure sensor, and a relay output for activation of external devices. Either alkaline or rechargeable nickel metal hydride batteries may be used. When the microphone is powered with a NiMH battery, the charging station can charge two mics at the same time.
A division of Phonic Ear, FrontRow offers the FrontRow Symbio system for classroom use where space is limited and installation must be quick and easy. The 940TM pendant microphone/transmitter has an adjustable neck strap and operates on one AA NiMH battery or a single AA alkaline battery. The unit connects directly to a battery charger through a 1/8in. mini port, and it includes an auxiliary audio input and mute button. The system can include the optional 950H handheld microphone to use the second channel in the receiver. The 950H has three audio gain settings to adjust to how closely it is being used and the volume of speech, and it features a 1/8in. mini auxiliary audio input for a portable MP3 player. The 950C charging unit can charge both the pendant and handheld microphones at the same time. The Symbio 5201R receiver can accept up to three IR sensor lines on RCA connectors, and it includes a 1/4in. auxiliary audio output with a mic/line-level switch.
Using standard IR carrier frequencies 2.06MHz and 2.54MHz, the 2.1oz. Redmike from Lightspeed Technologies is part of the Redcat classroom audio system. The Redmike VC version has a two-button volume control that raises or lowers the output by 2dB with each button push. It also features an auxiliary audio input. The Redcat receiver sits on a tabletop and has IR sensors on both sides and offers two stereo audio inputs, one with RCA connectors and the other through a 1/8in. mini. The center section puts out the audio signal from a 20W amplifier with a 20Hz-to-13kHz frequency response, and there is also an aux out 1/8in. mini jack with a volume control. The system can also use the LT-71 LightMic pendant or the HM-70 handheld microphone. The microphones can use either AA alkaline or NiMH rechargeable batteries, and the charger unit can charge two Redmikes in the cradle while also charging an HM-70 or LT-71 through an external cable.
The Nady Systems IRW-220X is a 2-channel infrared wireless microphone system operating on 2.0MHz and 2.6MHz with an audio frequency response of 60Hz to 12kHz. The IRW-HT6X unidirectional dynamic handheld mic/transmitter has a multiple-LED-emitter array, an LED power indicator, and a steel mesh ball screen. The IRW-LT6X body-pack transmitter may be either belt- or lanyard-worn, and it includes a 1/8in. mini jack for the microphone connection and an audio input volume control. Both microphone models will operate for up to 5 hours on two AA alkaline or NiMH rechargeable batteries. The IR-220X receiver has separate volume controls and IR signal reception LEDs for each of its two channels. The unit has two rear-panel RCA connections for the included IRW-1S infrared sensors, which come with wall-mount brackets. The rear panel of the receiver has a channel-mixed audio output, and each audio channel includes a screwdriver-adjustable level control.
OWI markets the CRS-101 infrared wireless mic system as a complete IR solution with minimal installation required. At the center of the system is the CRS-CASE amplified audio mixer including separate level controls for wireless mics, the line-level input source from two RCA connectors, the TV/DVD 1/8in. mini input, and the 1/8in. mini input for computer sound. The unit has two pairs of binding post loudspeaker output terminals and three mini jacks for connection of the CRS-IRS sensors, each of which has a 50ft. cable and a green LED that lights up to indicate that the connection is good and the system is active. The CRS-PMIC pendant mic can be used as a pendant mic or as an IR transmitter for a connected headset or lapel mics. The pendant mic can be connected through a mini jack to the included CRS-PCH 6VDC charging power supply. The optional CRS-HHMIC handheld micro-phone may be used at the same time as the pendant mic in the other IR input channel of the receiver.
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