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The 2-Input 2x 20W Class-D Speaker Amplifier from Intelix features two analog audio inputs and a balanced microphone input with ducking functions. Additional features of the amplifier include 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: push button, RS232, and IR with the AUD-220-IR accessory kit (sold separately).