Comes with the right power supply for seamless operation. Note: There's an internal rattle at full power.

Using this QSC HPR181W 18 - inch powered subwoofer is easy. First, connect it to the correct power supply that comes with it. Make sure the power source is stable. When you're using it, be aware that at full power, there might be an internal rattle. So, you may want to adjust the volume a bit lower if the rattle bothers you. For maintenance, keep it in a dry and clean place. Regularly check the power cord for any signs of damage. And if you're not using it for a long time, unplug it from the power source to save energy and protect the subwoofer.