Hi, I'm looking to buy a PA system. It's gonna be for acoustic instruments. We want it to be as 'plug & play' as possible as we want our teenage musicians to be comfortable setting it up. We need maybe 8 channels (for 8 mics). First fella I spoke to said powered speakers are deffo the way to go. 2nd fella said they were a pile of shite and give nothing but trouble. Left me feeling confused and deflated. Any advice?