If you can afford it, the Yamaha Series IV speakers are being phased out for the new V's. These are absolutely great speakers used by thousands of bands. Just a few months ago they were selling for over $350. Now, they're down to $230. This is a great speaker.
Get 'em before they're gone. They can handle 500W all day long and peaks of 1000W.
You do not really blow a speaker by underpowering it. What happens is that when someone has an amplifier that is not powerful enough, they tend to crank it up all the way till the amp starts clipping. This clipped signal from the amplifier is what damages the speaker.
Here is a page that will explain what "clipping" is.
http://www.audiovideo101.com/dictionary/clipping.asp
Even if you don't have your amp turned all the way up, you can still get clipping. For instance, lets say you run an instrument like a keyboard, or bass guitar into one of the channels on your mixer. Then you crank this individual channel up so much that it clips. Well, the amp doesn't know any better, so it will send this clipped distorted signal to your speakers which can damage them, even if you have the amp turned down low.
Your mixer and amplifier will have red LED's that warn you when you are clipping. If you pay careful attention to them, you will never have a problem.
If you know something better than Rock and Roll, I'd like to hear it - Jerry Lee Lewis
