The AS-55 is a speaker terminal type passive high-grade audio selector capable of switching up to three audio devices.It has the same grade configuration as a high-grade separate amplifier, including a highly rigid aluminum housing, a high-capacity 20A rotary switch for signal switching, and 6N (99.99997% copper) wire for wiring material for purity and low information loss. For speaker terminals, high-purity gold-plated types compatible with discrete wires, Y-lugs, and banana terminals are used in a thorough pursuit of high sound quality. By connecting this unit between an amplifier and speakers, it can be used as an amplifier or speaker selector for up to three amplifiers. .