"IOW it may be flat but it may not sound like it."
Actually it won't EVER sound flat if in fact it is because the frequency response of human ears is not flat.
See the Ear Sensitivity chart here for details and how that affects what we hear when listening to music.
http://www.independentrecording.net/irn/resources/freqchart/main_display.htm
That does not mean that flat frequency response in the sound making system is not a good thing. It is. It means whats coming out is the same as what went in, even if not always pleasant.
Actually it won't EVER sound flat if in fact it is because the frequency response of human ears is not flat.
See the Ear Sensitivity chart here for details and how that affects what we hear when listening to music.
http://www.independentrecording.net/irn/resources/freqchart/main_display.htm
That does not mean that flat frequency response in the sound making system is not a good thing. It is. It means whats coming out is the same as what went in, even if not always pleasant.