Apologies in advance if someone already mentioned this, but my guess is that Avatar doesn't see any net benefit (profitability IOW) in changing their 212 configuration. The technical merits of a 212+6 surpass those of the current configuration, but where's the market for it -- outside a tiny population of cognoscenti? What's on the shelves today is bass cabs with tweeters, and the manufacturers are the experts, so that must be what's best, so that's the thing to buy, right? Look, even among the consumers who do know better than that, do their careers (studio and live) stand or fall on the selection of a technically correct design over a "safer" one marketing-wise? I'd say no, and those consumers know that, and may just smirk and shake their heads a little while they pay for their shiny new tweetered cabs. Then they just forget about it, go back to work, and let the board and its plug-ins (or the direct box and the effects/EQ racks) get them the sound they would've gotten from a 212+6 anyway.
