To use this Crown CTs 3000 power amplifier, first, make sure it's in the original packaging and the power supply is correct. Connect the amplifier to your audio source and speakers using appropriate cables. Plug it into a grounded electrical outlet and switch it on. When using, keep it in a well - ventilated area to prevent overheating. Avoid placing it in damp or dusty places. For maintenance, regularly clean the exterior with a soft, dry cloth. If you notice any strange noises or performance issues, stop using it immediately and consult a professional.