To use this Sonance power amplifier, first connect it to the correct power supply as provided. Then, connect your audio sources to the appropriate input ports. When you turn it on, make sure the volume is set to a low level and gradually increase it to your desired sound level. As for maintenance, keep it in a dry and well - ventilated place. Avoid exposing it to extreme temperatures or humidity. Periodically check the connections to ensure they are secure. If you encounter any issues, turn it off immediately and consult the user manual or contact customer support.