Using the Aphex 120B Audio Distribution Amplifier is easy. First, connect it to the correct power supply that comes with it. Then, connect your audio source to the amplifier. You can then distribute the audio to multiple devices. When using, make sure the power supply is stable to avoid any audio interruptions. For maintenance, keep it in a dry and clean place. Wipe it with a soft cloth regularly to keep it looking good. Don't expose it to extreme temperatures or moisture.