If you are in the $300 price range (and the wedge needs to be powered), I would go for a used QSC HPR122i or JBL PRX512.
Both of those will show up on Craigs List for $350-ish and will sound much better than the Alto. IMO
if you find those anywhere near 300 dollars, let me know where, because my search had those in the 500-600 range, used. I'm sure they're good, but there out of my range at this point.