The volume pots increase in resistance from -18 to -10. One output module with screws is missing, but the amplifier still works well. It comes with the correct power supply, ensuring stable performance for your commercial audio setup.

To use this QSC ISA450 power amplifier, first connect it to the correct power supply included. Make sure all your audio devices are properly connected to the amplifier. When adjusting the volume, note that the resistance of the volume pots changes from -18 to -10. Be careful as one output module with screws is missing, but it won't affect the basic functions. As for maintenance, keep the amplifier in a dry and clean place. Avoid exposing it to extreme temperatures or humidity. Regularly check the connections to ensure they are secure.