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How could 100 Watt class a has more head room than a 300 Watt amp Class AB

Put aside which brand or make.
I put two amps into a test, both highend amp came from the same manufacturer.
Both double down the power with half of the impedance load, and THD is about the same.
Regardless of the size and cost difference, from a pure science perspective.
300 watt in theory should provide more headroom and sound ease when it reaches 100db, but the reverse is the true, the class A 100 watt seems to provide more headroom.
I have tried to use another set of speakers which is much easier to drive and it reaches the same conclusion.
Can someone explain why?
Quality or quantity of watt, how do we determined?
samnetw

Showing 1 response by tablejockey

tablejockey
4,012 posts
 
Not having any credentials such as a manufacturer or scientist, I always refer to the basics.For me it adds even more confusion, because we're talking about a music signal heard ultimately, by ears.

http://www.electronics-tutorials.ws/amplifier/amplifier-classes.html

I took a couple of analog/digital classes in the early 80s. An instructor that was an audiophile would blow the students minds  with endless physics/science  theory behind audio. It was way over my head!

I did become aware that most of us really are listening to just a couple watts of "linear "power. 

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