btw. wanted to comment on Essence being more "hifi" and therefore doing better with mainstream audiophile tastes.
I agree that the "hifi" sound has exaggerated treble, which I do not like and is why I got the Druids. I hope that Zu retains some reasonably priced model that has natural HF. I also understand that more sales will help them support more models, so if this is what the market wants, stupid market for wanting it, smart Zu for serving it (I suppose).
But there is also a market segment that did not try Zu because Druids measured very badly, especially in frequency response. Both Essence and Druid have ragged frequency response, and you just cannot get there without a crossover, which would turn Zu into a conventional speaker. Although the measurement side of audiophile world and the stereophile-followers don't like each other, I think that flat frequency response tends to sound like HiFi HF at the listening position. So, the pair of antagonists are maybe closer together on something directly related to sound than they think!
I wish there was some way to measure dynamics and tone. That would give Zu some good graphs it could use in marketing.