The MX225 from ART is a high-quality zone mixer with two stereo inputs and five stereo outputs. The two balanced XLR stereo inputs each get routed to all five zones. Every zone has balanced XLR stereo outputs. There are source 1 and 2 volume knobs on each of the 5 zones, with an LED audio level meter, and a button that sums the stereo signal to mono. For an example of how the MX225 can be used, imagine you own a medium sized restaurant. You have an entrance area, a main dining room, a bar area, a kitchen, and an office. You want the same music playing in the entrance area and the dining room, but at different volumes (softer in the dining room, louder near the busy entrance). In the bar area you want a different style of music playing at a louder volume. The cooks in the kitchen like variety, so sometimes they want to hear the mellow dinning room music, and other times they like the more rocking bar music. With the MX225 hooked into your sound system in the office area, you can control who hears what, and at what volume they are hearing it. If a customer asks you to turn down the music, you can easily turn down the music in their zone only. You plug the two different audio sources into the MX225, and connect the outputs to the amplifiers or powered speakers that are set up in the separate parts of the restaurant. The operation of the MX224 couldn't be easier. You simply turn up or turn down the volumes of source 1 & 2 in each zone.