As in, take the measurements with a grain of salt (for unrepresented off-axis and impulse response)? Or as in, throw salt over your shoulder to ward off bad luck (for out of spec components)? Or because they're bland?
My surrounds sound pretty good firing the occasional surround effects at the back of my head. I haven't listened critically to any Fluance speakers in front of me, though.
Edit: By the way, notice that the graph of the Signature bookshelfs is on a 60dB scale. Many of their other graphs are rendered on a deceptively wider scale. The
XL7F floorstanders, for example, are on a 100dB scale with the same height, thereby making the 10dB slope from 4 - 8kHz appear more subtle than it measures. The
XL5F1 towers' tweeter is 10dB louder than the woofer. The
SXHTBFR, 10dB quieter.
I say all that to say I'm skeptical that the much more expensive Fluances with which you worked actually produce similar frequency response plots. I wouldn't dismiss the Signature series before giving them an audition. The
HFF1 floorstanders graph with a reasonably neutral response similar to the bookshelfs, as does the
HFC1 center. I also observe that the Signature series is crossed over at a much more reasonable frequency (
2.3kHz) than their other series speakers (
6kHz in one case,
8kHz in another), so I predict mid driver breakup will be better controlled.
What am I missing?