We're using this in a school setting. We have two sets of these which gives us flexibility. Sometimes we use them to drive four speakers from one source. Other times we've set up two speakers in the gym, two outside. We set them on different channels and play from different sources. We've driven the outside set from inside the gym! These have functioned flawlessly. We've never had drop outs, lost signal, or any other issues with these units. They are amazingly good.