I haven't heard the new EON systems, but I've used a couple different old ones that my company owns... we use them to simulate aircraft noise. I've been in a room where a single EON was producing pink noise in excess of 110dBA. I could not stand being in the room without ear protection; trying my hardest, I lasted about 10 seconds.
They do loud, full frequency, very well. And are portable. Though I have to say, after moving one from the trunk to bedroom #1, to bedroom #2, to living space #1, back to the trunk and driving it to the next house, doing 10 houses a day, for several days in a row...after that I have come to hate the EON. Just seeing one can make me angry.
But for what you're looking to do (i.e. bass, loud, portable) it seems like a reasonable solution.
Are you going to be micing the acoustic guitar and violin, or are these electric-acoustic instruments?
Clean, all-purpose amp, with BASS recommendations
11"The bastards have landed"
www.myspace.com/thechromerobes - now has a couple songs from the new album
www.myspace.com/thechromerobes - now has a couple songs from the new album