For 75-85 dB a few watts are enough so ...

I also believe that this subject can be rather misleading to some. Sound pressure operates in a logarithmic scale. The difference between 1 and 10 watts is perceived as a 3db increase or a doubling of the volume. 10 to 100, then 100 to a 1000. So 500 watts is not "that" much more than 100. You cannot just say 500 watts is 5x more than 100. What it does allow is more current output and a better handling of steep impedance curves.

Thank all your for your responses! I got it know! Macd made a good point: it has to do with the logaritmic scale. Doubling the power does not mean to doble the perceived sound presurre level just a 3 Db increse. Thanks again.

You also have to keep in mind that a low powered amp pushing a hard load can clip because of the lack of head room. You may not even know your destroying the speaker beacause of soft clipping.

Lokie,
Excellent!