[quote name='Bill Fitzmaurice' timestamp='1386021302' post='2294814']
For the woofers, nothing. If you have tweeters they can be damaged by too much harmonic content, and excess harmonic content is what's created when an amp (or any device in the signal chain, including fuzz pedals) is pushed to clipping. You're far more likely to push a smaller amp to clipping than a larger one, and the smaller it is the more likely that scenario.
[/quote]
And this.
The difference between 500W and 600W is nothing to worry about.