So my band is looking into getting a new powered mixer. Right now we have an ancient peavey one, 210 watts at 4 ohms. It's too weak. We're looking at the Yamaha EMX68s, but I have a few questions! 1.) It says channels 1-4 have balanced XLR connectors while channels 5 and 6 have 2 unbalanced inputs. What does this mean? can I still just plug a mic into to 5 and 6 and use them? 2.) What is phantom power? Searching on here led me to some confusion... is it just for condenser mics? If I have regular mics, should I just leave it off and ignore it? 3.) How loud will this be? we'll have two 8 ohm peavey 15s, so that's 275 watts per side. That's compared to our current 105 watts per side. Our drummer is unholy loud, so we all end up quite loud... is this going to be too weak? thanks for the help!