This is my latest toy, the new cylindrical radiator speaker from Bose. It's very different from anything else I've ever used. So far I've done one live gig with it and was very impressed. It's the first time I've ever heard every note I sang or played. Quite Frightening!! There is more than enough volume for most small to mid-sized places. There are two balanced low impedance channels and two line in's. Four channels in all. I would presume most users would plug in a mic and a guitar and would want to use the two main channels to take advantage of the remote mixing control. To do this a d.i. box will be needed for the guitar. I solved this problem by using a high to low adapter that I had in my "antique equipment" box.
This system is really great and I can't wait to use it again. I will definitely be taking it on my S.W. tour later this month.