To use this BSS BLU-BIB 8-channel input expander, first, connect it to your audio system. Make sure to use appropriate cables for the 8-channel input. Since it doesn't have a power supply, you'll need to provide one separately. When setting it up, place it in a well - ventilated area to avoid overheating. As for maintenance, regularly check the connections to ensure they are secure. Clean the exterior with a soft, dry cloth to keep it looking good. If you encounter any issues, refer to the user manual or contact customer support.