So, I'm gonna start playing at parties and I have my and my friends birthday party this upcoming Monday so I'm a bit pressed for time. I've been looking at powered PA speakers to play indoors for now. I decided to go with the Harbinger APS15, but I just saw an ad for a slightly used yamaha pa system for $620. Also there is the Behringer B215 A for $500 used. Basically I'm just looking for the better deal here. I don't know much about PA systems and how to mate the correct amplifier to the correct PA speakers. I don't know what would sound better indoors vs. outdoors. What I do know, is that Yamaha is a much better brand, but I'm wondering if it's worth the extra 120 dollars that I could put toward a subwoofer in the next month. Which comes to my final question: How much is it gonna suck without a good 15 or 18 inch subwoofer? I've strained my google-fu and searched the forums only to find little pertaining to my questions. Thanks for the help guys.