There really is not an optimum size rule.... so whatever sounds good. For the powered speakers, the quality of the amp(s) built into them are also an important factor.
I like a very clean sound without a "muddy" overly bass heavy resonance sound. I am most concerned about the midrange clarity and smoothness of the speaker. I have QSC K8 speakers and like them for their sound quality and how they work for my style of acoustic guitar/vocal music.
I have heard the QSC K12 speakers and I thought they were too bassy sounding in the setting I heard them in and for the female guitar/vocalist who was using them.
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Paul
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