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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 elevick

elevick
2,638 posts
 
Timlub, sorry to do the math for you but 100 watts will gain 3db every time the wattage doubles.  200 watts +3db, 400 watts +6db.

You will be hard pressed to tell the difference in amp power when comparing most a really good 100 watt class A to an average 300 watt A/B.  Check the specs also for dynamic headroom.  That might be your answer.
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