So I've got a Fishman loudbox artist that I sing through with some guys on bass and drums. Its got a pretty good sound but is a little quiet-mostly looking for vocals. What is a decent powered speaker to plug into it to get a bit more volume? Not looking to break the bank- would like to stay under $300 or so. I am a bit ignorant on these but my understanding is that I can run a line out from the loudbox artist to a powered speaker? thanks