^^
That may be nothing more than marketing differences targeting different groups, if there is no tollerance stated for the measurements.
The smaller range stated for the professional crowd may be the same driver measured to a tigher tollerance. Most consumers have no concept of meaurement tollerance so if they see a larger range of frequency numbers stated, they simply take that to mean 'better'. Even though the response may be nothing close to flat and WAY down at those extremes, the driver is still producing measureable sound, so technically it's truthful.
I still have a 25 year old pair of Sony V6. Haven't used them in the last 15 or so since the pads disentigrated. They were good cans I'd have no problem recommending in general, even though I can't say how they'd compare at this point.