The km series KM-S powered subwoofer was introduced in 1994 and manufactured until 1996 specifically for U.S. Armed Forces worldwide distribution. The km line was the last line Klipsch made specifically for the U.S. Armed Forces. While no longer in production KM-S subwoofers are still owned and listened to by Klipsch fans around the world. To connect with other people who are passionate about audio and interested in Klipsch products visit our open forum bulletin board.