"It is a strange thing that compels people to replace good components with other good and even more expensive components. "
This is exactly the thing I was talking about... for example, upgrading the crossover in a nearly new GR AV-1, JBL S38 or Klipsch RF-7... that would mean putting in inductors with fancy wire, polypropylene instead of mylar capacitors, etc. See this thread:
http://www.hometheaterforum.com/htfo...hreadid=140533
The point I'm driving at is that any distortion caused by passive components such as those in speakers is known to be less than that of any active component, like a transistor... and then there are also dozens of capacitors and such in all our equipment. So if there really are differences in crossover components, there sure as heck are differences to be found in digital equipment.