Tvad & Aktchi, I see the Gap in pricing is a decision for some that something is missing in the model structure, but they have already filled that gap.
It's simple they seem to have wanted to provide the biggest bang for the buck on a SMALL and simple speaker with the Druid and tones for overall music listening, and an all out assault still using the same philosophy with small footprint but quite a bit heavier and sizely definitions for the very serious rooms and demanding applications.
They Will still sell you the Druid in most cases with a single FRD that does its thing, but Simply Sell you a Method Subwoofer which will put you right in the middle of the cost range between the 2, and yes it integrates just fine, now you can BUY 2 Methods I believe but will then be approaching the cost of the definition, which simply is why they would most likely point you to the simpler and more intergrated approch of the Definition.
So I do not see them doing anything with the druid and adding an Internal Sub or something to simply make another powered tower... However if the demand is there than I guess they could consider it, but no way will it be as compact as the druid is, and then it would cost probably 5500.00 a pair anyway to fill the concern of your Gap between 2 Models.
So keep it simple in fixing the 40hz issue, add the Method subwoofer and its done and in the price range you want to see, it is designed with very fast drivers to keep up with the druid for this purpose I understand, and then they can Universally sell The druid to the SET single driver group, and just have someone get the package with a Sub for the Theater Rock group and there you go with the in-between pricing.. It makes perfect sense... Cause any more and you might as well get the Definition.
I mean you can take the definition and cut off the 4 drivers on the back and run the Front's only which would just be a Druid plus or something and give you 2 Drivers vs. 1 driver but still the same issue with wanting to go under the capabilities of a full range driver at 40 hz and you end up with the same problem at a 5500.00 range speaker anyway and would still need to add more bottom end, unless they break down and start putting in crossovers to give you a passive woofer pair or something like a conventional speaker.
Just my opinion, but Zu is attacking a Niche for a certain purpose, they are not a mass manufacture, I mean does every speaker manufacture fill the gap? Sure many do we have all seen the Glossy adds with a speaker using 1 driver, than 2 drivers, than another model going from a 4.5" midrange to a 6" midrange and Adding an 8" on the bottom and this and that and So on... But I do not see the realistic application in this instance.