I disagree

if your source is putting out 50h-18khz at 10 percent distortion (I have seen cheap cd players with these stats)

and your amp is adding 5% more distortion then the best speakes in the world will still sound like junk

Speakers don't really add distortion the just do there best at playing the sound feed to them, I would go amp, source, speakers in that order

If you have a good clean amp you can use less volume on the deck and get a clearn sound

if you have a good source you are putting out less distortion for the amp to work with