Is there such a thing as too much power?

Hi @agwca ,

It is not true. Every particular room has the parameter Critical Distance:
https://en.wikipedia.org/wiki/Critical_distance
"Critical distance is, in acoustics, the distance at which the sound pressure level of the direct sound D and the reverberant sound R are equal when dealing with a directional source. "
For typical listened room critical distance can be just 1-2 meter. And Critical distance is different for different frequencies.
If the distance from the speakers is longer than Critical Distance the sound pressure remains similar to sound pressure on the Critical Distance.
http://journal.telfor.rs/Published/Vol2No2/Vol2No2_A6.pdf

Regards,
Alex.

@agwca If only a sine wave then your numbers are reasonable. But if reproducing a full spectrum audio signal its a bit different!

I only look at speakers min 96 db efficiency so I don't believe in high power amps. I just need 20 high quality watts.

Thank you sincerely to all the posters for educating me with your wisdom and experience - you guys are a source of great info...