100 watts enough?

my speakers adequately. I have EgglestonWorks Andra III speakers which are 88db efficient


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There is your problem. 
88 db ~~~IN~~ Efficient speakers, 91db+ = EFFicinet speakers, 
91db < = INefficinet speakers, 
Power = power, 
you only need 25 watts to drive a   wide band. 

charles1dad7,807 posts07-03-2021 9:06am@unsound wrote,
’Many amp designers suggest that amplifiers are typically at their most linear when operating at about 20% of their output

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It is true the lower the gain on the linestage vol, the sweeter/cleaner the sound.
But who here listens at a whisper.
So 9oclock - 10oclock is ideal gain on vol. Over 10oclock you are adding to distortion, making 85db max on vol level. 90db, yuckkk, tahts too LOUD mouth.
I listen at 70db near field. If 70, most likely 60

I am using no more than say 15 watts of the Defy 7's 100 watts. 

charles1dad7,812 posts07-03-2021 8:41pmFrom John Atkinson/Stereophile,

"The EgglestonWorks Andra is moderately sensitive, my estimated 87dB/

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Sorry to disagree with 
John Atkinson @ Sterophile
But I will
87db, ~~MODERATELY~~ sensitive??
The TRUTH is
87db = IN-Efficient 
IOW 
In/UN Effective.
= Blood sucking speakers. 
Below 91db = INefficient/low sensitivity. = all xover box designs Inefficient. 
Lets  be honest around here , would we please.