Wireless In-ear Monitoring Systems
Oct 12, 2009 12:00 PM, By Bennett Liles
Clarity and comfort have brought stage monitoring under control.
Hear Technologies introduced the Freedom Back wireless in-ear monitor system to complement the Hear Back personal monitor mixer and Mix Back matrix monitor mixer. The system is available on either the UA or UB bands. The UA band ranges from 584MHz to 608MHz, and the UB band ranges from 655MHz to 679MHz. There are up to 120 digitally selectable channels in each of these bands depending on availability in the local frequency spectrum. Up to 10 transmitters may be used simultaneously in the same location, and each may run in mono or stereo mode with separate input level controls. Input signals enter on combination 1/4in.-and-XLR connectors, and the transmitter has a built-in automatic limiter, a switchable 12dB attenuator pad, a headphone port with volume control, and a back-lit front-panel LCD showing frequency, audio level, group, and channel with three menu navigation buttons. The receiver has its own LCD showing group/frequency, mode, RF and AF levels, and battery life. The unit works for 4 hours to 5 hours on two AA batteries. There is also an RF-signal-presence LED and three menu navigation buttons for setup and frequency selection.
For the needs of a very simple and quick in-ear monitoring solution, Mipro offers the MI-808 system with the MI-808T transmitter featuring 16 selectable preprogrammed frequencies, pilot tone muting, dynamic expander circuitry delivering a signal-to-noise ratio of more than 90dB, a built-in limiter, and a front-panel headphone monitoring jack with volume control. Output power is selectable between 10mW and 100mW, and the audio frequency response extends from 80Hz to 15kHz ±3dB. Input signals enter on combo 1/4in.-and-XLR connectors, and the unit comes with a pair of rack ears. The front-panel LCD shows channel and frequency, and these are adjusted with adjacent menu navigation buttons. The MI-808R receiver uses diversity reception with dynamic expander circuits and stereo/mono operation. The unit includes power and RF-signal indicators, and the LCD shows the channel number. All of this is housed in a magnesium alloy case, and it runs on AA batteries.
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