UNPLUG subwoofer/amp and place it on a SOFT flat work surface, such as an antistatic mat or a thick towel. Place it on its side so that the 3-D plastic Klipsch logo faces down and the amp/speaker connections are facing up.

Unless you're sure what you're doing, NEVER touch the capacitors, or you could receive a dangerous or even lethal shock. If you're not sure, leave the amp unplugged 3 or more days before taking it apart.