I think we are getting a little off track. If I understand the poster, he is asking does a (for example) Classe CA301 sound better than a Classe CA201. A comparison of the same line is what he is after. My response would be that it depends on the sensitivity of your speakers. However, in the case of the classe, the 201 sounds quite a bit better than the 101. Not necessarily because it have more power, I'm not really sure why. I think you will find the same thing within the pass labs line. The 250.5 will sound better than the 150.5.
I think in most cases, this is true, but not all of them. Again, I think it largly depends on your speakers.
I think in most cases, this is true, but not all of them. Again, I think it largly depends on your speakers.