Amplifer Wattage Question

Here are a couple a simple-to-built LED audio output meter schematics. Easily fast enough to register peaks. They're limited to 10 power levels, and won't give you fine measurements though. (http://freecircuitdiagram.com/2008/09/13/audio-power-meter-show-audio-amplifier-actual-output-power/) (http://www.circuit-projects.com/audio-circuits/10-led-vu-meter-project-by-lm3915-and-lm324.html)

Thanks everyone for your responces.

I was woundering if a amp. is rated for 10 watts of class-A operation 250 watts totel A/B. At what volume level is the amp coming out of class-A ?

How loud is 10 watts ?

How maney watts is a amp. putting out at normal listening levels ?
Just curious how this works.
Thanks Russ

Russb - 100W is 2x louder than 10W. 200W is 1.23x louder than 100W and 250W is practically the same as 200W. So in total 250W is about 2.5x louder than 10W.

Russb - try this formula L = P^(1/3.5) where P is a ratio of power and L is a ratio of loudness. In your case L=(250/10)^(1/3.5)=2.508