Those Bose PAS systems work well if you use mics that aren't too sensitive. I've twice been in situations where they needed to work with a large diaphragm condenser mic (once with AKG, once with AT) and the PAS systems feb back severely. They had to be moved far forward and in one case we could never get the volume above 1 with out feedback. They are great systems but they have characteristics that must be accounted for.

In my retirement, I've begun working in a local guitar shop (Stars Guitars) where, among other things, we sell acoustic amps. I've had a chance to work with quite a few popular amp models but the absolute best in terms of both sound quality and portability are the Schertler products.

The Schertler David amp is amazing. Input for acoustic guitar pickup and condenser (XLR with phantom power) or dynamic mic. Eighty watts, bi-amped, built in spring reverb, controls for each channel, and a sound that will fill even the corners of any room such as coffee house or medium sized church. And it weighs 20 pounds.

The Schertler Unico has three channels, 180 watts and weighs 32 pounds.

There is also a bass unit that doubles as a stand for the vertical pole that may be used to elevate either the Unico or David amps.

We've had people come in to by electronic tuners and walk out with one of these amps. One fellow from Chicago wanted to buy a very nice guitar with a built in acoustic pickup. We had him try the guitar through the Schertler David to hear how it sounded plugged in and he wound up passing on the guitar and taking the amp home.

Everyone who hears these amps either buys one or wishes for one. No exceptions.

I don't mean for this to sound like a sales pitch, it's not. It's just that these are soooo good. It's like braging about a new guitar or something.