I can’t add much to what others have said, except to agree that the Bose Model II is the best vocal PA I’ve ever owned. Coverage was great, with lots of compliments. However, I’ve convinced myself that backing tracks in stereo sound better----especially for arranger playing, guitar, etc... So, I sold the Bose and got a stereo mixer with powered speakers. If Bose ever figures out how to do what they do in stereo, I’m sure I’ll return.