Passive Pre-amp: Improves overall sound quality??

Thanks to all have been responded. I have now begun my reschooling in basic electronics.

BTW, Brownsfan: Sam's current wunderlich (I know, bad pun) is the Music First Passive pre-amps. He wants to (again) do away with all active pre-amp because of all the "nasties" they ad to the music. Yes, but at what price and convenience??