Target the sound directly at the audience with an increased signal-to-noise ratio. Each has speaker mounts & spring-loaded terminals for audio, connects to computers, LCD projectors & media players. There is the powered 16-channel UHF (900 MHz) PI39 which can receive wireless audio, powered non-UHF PI30-PS; and the non-powered non-UHF PI30-SP included with the Infrared Classroom Audio System.
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