The ART MX225 is a zone distribution mixer ideal for controlling the volume of multiple amplifiers or speakers remotely. There are five output zones available each with two stereo sources handling separate left and right balanced line level signals. There are two sets of inputs each offering either mono or stereo configuration - both with independent control of levels. This is indicated by a built-in LED so you wont be caught out. LEDs are also used for metering purposes showing the decibels of each zone channel and if it is clipping.