Flat Anechoic Measured Frequency Response Speakers

Looking at the measurements for several speakers I know well, it surprises me how similar many of them are. For example, Dynaudio C1 and Thiel 2.4 look quite similar (and both very flat) to my uneducated eye, although they don't sound the same. Interesting to look at something like the Reference 3a MM decapo, which seems to measure pretty horribly. Or the Silverline Sonatina, which has a big midrange dip. Even the Watt/Puppy is a bit ragged. How important is this, I wonder.

Would love to see measurements for some models of Harbeth.

The deviation on top is a roll-off, not sizzle, I believe. The curve most people like bumps a bit in the mid bass and slopes off gradually in the treble.

Jkalman, no I don't have a quote. I was making an assumption based on the consensus standard for these things.