I have to agree with Michael K, Bose Speakers plus a 12 channel mixer etc is the way to go. These self contained mixers such as Yamaha with amps combined 3 serious disadvantages, 1 if they fail the whole lot fails, 2 they are difficult to expand and 3 usually lack features found in stand alone mixers and amps. I play semi professionally sometimes 8 times in 2 weeks and all my gear is packaged so that it packs in the car easily, it is not too heavy and I have a 12 channel Behringer Mixer (good price and lots of features) plus separate amps. If my main amp breaks down (which has happened) I am able to swing the monitor amp into action for out the front. The monitor amp may be small but it beats losing the whole system. I also carry a spare small 6 channel mixer as a back up