I know it seems like every time I answer someone's question, I happen to have the item for sale ... LOL
But any guitar with an undersaddle transducer can be remarkably improved using a Fishman Aura preamp. You load it with downloadable images from the Aura website until you find the perfect one for your guitar, then you blend the image with your guitar's regular output. The one I use is the Aura Spectrum; it gives you the option to load dozens of images for your guitar, the blend control, tuner, onboard compression, 3-band EQ for your non-image sound, and automatic feedback suppression.
I recorded this sample direct, first with just the output from my WY1-K (almost sounds like there's a phase shifter or chorus on it, but that's just the undersaddle pickup), then using the Aura image. Dramatically better, gets rid of the quacking and sounds like a real mic'd acoustic guitar. I forget which one I used on the WY1-K now, you hook up the Spectrum to your computer and audition a bunch of 'em and load the ones you like. You can adjust the blend so it sounds right at the venue.http://52vincentdrive.com/aura.wav
They are $335 new; I have a gently used one for $250.http://leftyguitarsonly.com/fishman-aur ... and-preamp
Goes without saying, but the quality of the PA has everything to do with how the acoustic will sound over it. My guitar sounds great through my QSC K12 speakers and the Aura preamp.
I'm ordering a Martin with the Aura onboard, so I no longer need the outboard preamp.