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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 cal3713

cal3713's avatar
cal3713
1,421 posts
 
I'm with @tablejockey 

Not really convinced that your speakers ever even drew 100 watts.  

You can actually measure how much they're pulling at those volumes using this technique:  https://forum.audiogon.com/discussions/how-much-power-do-i-need-find-out-using-this-method
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