The S-560 permits changes to the audio level of speakers and horns without altering the speaker wiring connections. Tap the speaker for the maximum audio level required and use the attenuator to change the volume level. The attenuator features a stainless-steel plate with numbered scale and fits a single-gang electrical wall box. The attenuator controls a 20-Watt speaker load with a 10-position tap switch and operates on 25 or 70V speaker lines or 45 Ohms talkback speaker applications.