Originally Posted by bigAWL
... * The information Macfan424 got from DefTech indicates that the Gem/GemXL drivers are actually new and improved over the ones I’ve grouped them with, but I didn’t break them out separately.
Actually, there are other cases where the drivers are different, albeit the same size. The Nines compared to the Threes, for an example. The Nines use the newer drivers developed for the STS's; the Threes use the older ones that match the Fours. Your charts reflect that, intentionally or not. On the other hand, it's pretty certain that the ProMonitor drivers are distinctly different than the Mythos, regardless of size.
I seem to be rather lonely in this, but I think too much emphasis is placed on driver size anyway (not here especially, but on AVS in general). Voicing is much
more important. For that matter, positioning may well be a bigger factor. A good designer can match two speakers very closely, even when employing different sized drivers. Further, even identical speakers will sound slightly different in a real room depending upon their placement, and it's all but impossible to make horizontal speakers sound absolutely identical to vertical ones even when they have the exact same drivers (this invariably shows up in lab tests).
DefTech has taken the position that the whole Mythos line is designed to mix and match seamlessly. They have been quite willing to recommend combining different driver sizes in their system suggestions, and I, for one, am inclined to take their word for it. They know how their speakers are designed, and they have a vested interest in suggesting systems that make their customers happy.
That said, your chart is interesting and handy, bigAWL, although I'd guess the Gem XL's are closer to the STS/Nines than the Two/Tree/Fours. (Maybe the midrange of the former and the tweeter of the latter???) I also think the ProMonitors should be treated separately.
On the other hand, while I wouldn't say "better" the the XL's, I'd bet that the ProMonitors would combine very well as rear surrounds in a Mythos system. I recently inserted a pair of old Polk M3's (a Sandy Gross influenced design from his salad days at Polk) as rears, and they blend effectively with my STS/Threes, even on pink noise. No doubt a more current Gross inspired design would blend at least as well. While I firmly believe the front three speakers should match as closely as possible, the rears (and, to a lesser extent, the sides) allow much greater latitude.