does more power=better quality ?

thanks for all the inputs.
i should elaborate more on my question.
let say if i use a bookshelf speaker ( revel m20 or bw 805). i get the impresseion from some post that lower / midpower sounds better than the higher power model ( within the same brand ) for example. some have say pass x250 sound better than the x350, or a krell 100 watts sound more sweet( whatever athat means ) than a 600watts krell amp ( again same company and same line product) i was comparing a sony receiver to a levinson amp.
i like to know is it true and why

correction
i mean i was NOT comparing sony to levinson amp

S7horton,

Let's take the comparison of the Classe CA301 at 300 watts
and the Classe CA201 at 200 watts.

If the design of the amps is essentially the same, and Classe
selects components with the same quality; but it just puts
more transistors in the CA301 than it does the CA201; then
yes.

For the same load, the transistors in the CA301 will each
be providing less current than their counterparts in the
CA201. Therefore, because the transistors in the CA201
are putting out more current - they are farther out on
the transistor's response curve. Depending how linear
that curve is - indicates how much less accurate the CA201
will be than the CA301.

If the curve was perfectly linear - then there would be
no difference. But real transistors never have perfectly
linear curves. The CA201's transistors are extending
farther out on the curve than the ones in the CA301,
because the CA201 has fewer transistors to carry the same
load.

The difference may be marginal, if the transistor's
characteric curves are fairly linear; but there is a
difference because the curves for real transistors are
never perfectly linear.

Dr. Gregory Greenman
Physicist

Great general question, I have really enjoyed the answeres

My 300B SET puts out a whole 8 watts. It's playing 98db speakers with a flat 8 impedance. Hm! Would you say it's loafing? It sure sounds better than any high power amp (Tube or Solid State)that I've owned or had the pleasure of listening to. I've heard some pretty good S.State high power driving stats. or other difficult speakers also. It's about having the right gear for the grade!