Ive always been more/less a hired gun as a guitar player in blues bands, and knew very little about live sound systems. I recently moved and have been forming my own band, and for the first time am responsible for the pa system. Basically for practice i low budgeted out and bought a phonic 220watt a channel pa with two 15 inch speaker mains and poles, which have been serving well for reheasals. We have our first gig coming up in a month and the bass player and i have been wondering if this pa will handle the mid size room we will be playing at(an american legion hall). Bass player offered to buy a subwoofer to add the system(bass minded that he is).I guess my question is, what would be most cost effective to add to our system to give us a little more power if needed? Thanks.