I think the point about 20 vs 200 is that if you have any hearing left you are usually only using 5-10 watts of power (even on inefficient speakers). At reasonable volume levels you should not be running at full tilt.
The more amperage that a given watt is composed of, the more powerful that watt sounds (IMO). Watts have both an ammperage component and a voltage component. Someone with a more technical background could give a more scientific reason why, but 125 Sony watts do not sound nearly as powerful (not to mention musical) as 75 parasound/pass/YBA/etc watts.
The more amperage that a given watt is composed of, the more powerful that watt sounds (IMO). Watts have both an ammperage component and a voltage component. Someone with a more technical background could give a more scientific reason why, but 125 Sony watts do not sound nearly as powerful (not to mention musical) as 75 parasound/pass/YBA/etc watts.