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The TSU transport loud-speaking device has been produced since 1988. The device is designed to transmit operational information from the driver of a public vehicle to passengers. The device consists of a microphone, amplifier and speakers located in the cabin of the vehicle. Brief characteristics: Rated output power of 6 W at a supply voltage of 28 V and a load of 4 Ohms. At a voltage of 14 V nominal output power is 2 watts. Nonlinear distortion coefficient of 3%. The range of sound frequencies reproduced by speakers is 100 ... 10000 Hz. More information about the device loud-speaking "TSU" in the instruction manual.