Amp vs Preamp

The Math used for matching is only that 'Math' it is not end sound.

End Sound is the result of how Upstream Electronics have processed a Source Signal, which is being transferred to a Speakers Xover, from where a conversion from electrical energy is to become mechanical energy and hence Sound is produced. 

I guestimate 99% of individuals with a keenness to experience recorded music through audio equipment, are assessing perceived quality, through the end sound they are exposed to. 

Experiences had of Pre -Power Amp combo's, strongly suggest from an end sound assessment  that a Power Amp' that stands out when matched with one Pre Amp' Type,  can be experienced to appear mediocre, a shadow of what it can be, if the correct match of Pre Amp' is overlooked.

Whether the Power Amp' of a different type is able to lift a Pre Amp's performance, that has not matched well to certain Power Amp's in experiences I have had, is an unknown to me. 

My experiences are that the Pre' is the enabler to that very special end sound.