"Michael McKelvy" wrote in message news:kn4Ac.45987$eu.38549@attbi_s02...

We can't? Why not?
Isn't the job of any audio component supposed to be that it reproduce the
signal being fed to it without any audible distortion and with flat
Frequency response? That is the definition of High Fidelity that I use.

Well, knowing what is perfect is way different than ranking two
imperfect measurements. Consider that there is two speakers with
almost linear FR. However, other has slight bump in 3k region and
other has similar bump in 5k region. How can we tell which is
better without listening?

Lasse Ukkonen