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The 3-Input 40W Class-D Speaker Amplifier from Intelix features 70 or 100V outputs. The amplifier features two analog audio inputs, one digital audio input, and a balanced microphone input with ducking functions. Additional features of the amplifier includes input and microphone volume control, bass and treble adjustments, microphone mixing with source audio, and three modes of microphone input support (48 dB gain, 48 dB gain with 48V phantom power, and line level). The speaker amplifier has three methods of control such as push button, RS-232, and IR with the AUD-340-IR accessory kit (sold separately).