That is generally a nice, smooth plot, but I wish they didn't give a ±6db tolerance! That allows 12db difference between the loudest and softest which is not a reasonable standard for listening to music.
Looking at the plot, it looks like they could claim 80Hz to 15kHz using a much more impressive ±2db tolerance.
Not many speakers can claim that flat of a FR!
That is a nit pick in the scheme of things, but SVS is good about providing data and graphs and it is a shame that they chose to declare the FR using an unreasonably wide tolerance.