Wireless In-ear Monitoring Systems
Oct 12, 2009 12:00 PM, By Bennett Liles
Clarity and comfort have brought stage monitoring under control.
Beyerdynamic designed the IMS 900 in-ear monitoring system for simplicity in setup and programming with the system available in the United States in the band of 620MHz to 644MHz with 16 preprogrammed channels, any eight of which can be used simultaneously. On the SE 900 transmitter, the frequency and channel are displayed on the front LCD. The system also features pilot tone muting to avoid blasts of extraneous audio in the earphones when the transmitter is turned off, adjustable input gain control, a mono/stereo switch, and a headphone output with volume control. The TE 900 receiver uses diversity reception for dropout-free operation. There is also adjustable squelch (2µV-100µV) and a switchable limiter. The front display shows channel setting, and the unit has LED indicators for battery level and RF signal. For adjustment of the two monitor signals, there is also a balance control that works as a pan pot to shift the left and right earphone levels. The operating time on two AA batteries is approximately 10 hours. The IMS 900 system may be used with the DT 60 Pro earphones, which come with three sizes of silicone ear pads.
Delivering 30Hz to 15kHz audio frequency response and an A-weighted signal-to-noise ratio of 80dB, the Carvin EM900 system offers 960 channels and has a built-in limiter and twin combination 1/4in.-and-XLR audio output connectors on the aluminum case. The audio input level is switchable between 0dB and -10dB with a channel separation figure of 35dB and an audio loop-through for feeding multiple transmitters on the same audio signal. The transmitter also has an earphone output with volume control. The transmitter and receiver have LCD panels displaying frequency and channel, and these are set with adjacent pushbuttons. The EM901 receiver’s LCD shows battery condition, and the unit offers a pan control for adjustment of the two independent audio signals in stereo or mono. The EM902 ear buds are available as an option with highly flexible braided cable, and transparent driver enclosures make them virtually invisible on the user.
The AS-1500 Any Spot wireless personal monitor system from Galaxy Audio transmits a 10mW UHF signal in the 655MHz-to-679MHz range in either stereo or mono mode for a normal operating range of 300ft. with 120 selectable channels. The audio frequency response is 60Hz to 16kHz ±3dB with a signal-to-noise ratio above 80dB. The AS-1500T features twin 1/4in.-and-XLR audio output connectors with an adjustable input level and a front-panel LCD that shows left and right audio levels, group and channel numbers, mode select, and other information. These parameters are adjusted with adjacent up, down, and set buttons. The unit also has a 1/4in. local headphone output with volume control. The AS-1500R receiver operates in mixed mono mode with a mix control and features a level control, EQ boost, limiter switch, and LCD that shows group/channel, RF and audio levels, limiter select, mode information, and a three-bar battery-level indicator. Operation on two AA batteries is about 6 hours.
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