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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
erik_squires
16,041 posts
 
You are going to have to offer very specific examples of the amps you are talking about as well as the speakers.

Best,

E
Post removed 
georgehifi's avatar
georgehifi
10,312 posts
 
How could 100 Watt class a has more head room than a 300 Watt amp Class AB

If one were a Mosfet output and the other a BJT (bi-polar) and both were well engineered push/pull and driving into a heavy load, such as the Wilson Alexia which has an EPDR (equivalent peak dissipation resistance) of just .9ohm!!!! at 65hz.
Then the 100w BJT amp would drive it better than the 300w Mosfet.
As the 100w BJT "could" in effect give out 800w into that .9ohm load where the Mosfet would probably go down to less than it’s rated 8ohm 300w output.
Cheers George
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