Yes they do. Those little plastic plugs are there to satisfy European safety regulations. Turns out that Euro AC plugs and sockets are the same size and spacing of dual binding posts and banana plugs used in the US of A. It is a real bad idea to plug your speakers directly into an AC line. IF YOU LIVE IN A COUNTRY WITH 220V AC, DO NOT REMOVE THE PLASTIC INSERTS!

THESE INSTRUCTIONS FOR NORTH AMERICAN OWNERS ONLY! For most of our models the plastic plug can be pried out with a sharp knife or tool. On some models, such as the LSi Series, you must first remove the binding post nut. Fully unscrew the binding post nut until it comes off. Use a small screwdriver, knife or nail file to pry out the plastic insert. Screw the binding post nut back on the post. Do one terminal at a time to avoid messing up the +/- color code.