AtlasIED AA-YSUM Passive Stereo to Mono Summing Cable

Commercial AV integrators regularly encounter a shortage of stereo summed inputs on mixer amplifiers when connecting multiple playback sources such as CD players, DVD players, tape decks, or satellite receivers. The AA-YSUM provides a direct, passive solution by combining dual RCA inputs through an internal resistor network into a single three-position Phoenix/Euro-style connector compatible with the AA Series and similarly configured mixer amplifiers.

Unlike active summing boxes that introduce an additional powered device into the signal chain, this passive cable requires no external power and adds no active components to the path. The resistor network maintains input and output impedance matching, making it appropriate for the mic/line inputs commonly found on commercial mixer amplifiers where open mono inputs would otherwise go unused. It is a purpose-built tool for installed sound environments where simplifying source connectivity at the amplifier is a recurring requirement.

For AV integrators working in hospitality, retail, corporate, or house-of-worship installs, the AA-YSUM reduces the need for additional mixing hardware by converting unused mono inputs into usable stereo playback connections — a practical efficiency in both design and installation labor.