The Niles SAS-1 Combination Speaker-Level A-B Switching System designed to replace manually operated A-B switches. It automatically switches from A to B when a signal is present at its B input. The unit's three switching sections can switch three different kinds of signals: Line-level audio, composite video and speaker level audio. The SAS-1 switches each of these sections at the same time, allowing simultaneous control of these signals if needed. Five-way speaker wire binding posts are provided for the speaker level switching and RCA-type phono jacks are provided for the line-level audio/video switching.