OK, so, here's the question:

Do all speakers with flat response sound the same?

Let's refine the vopros, if I have a speaker which only reproduces the frequency range of 5000Hz to 10,000Hz, but produces a ruler flat response will it sound identical to another speaker of another manufacturer which produces a flat response...

Do we think that all the variables which contribute to a speaker's sound quality are measured by a frequency response curve?

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.