Using common sense, my prior exposure and current ownership of the Essence, I would predict a return to the Zu house sound,i.e. less concessions to a modern 'commercial' sound as the ribbon tweeter in the Essence was supposed to do. To match the ribbon, the widebander's sensitivity had to be padded down. With the Soul, I think it's back up. The Griewe loading of the Essence (that foam cartridge) really works and apparently the Soul's turned/twisted design and new 'breathing holes' are an advancement on that.
My assumption is thus an upgraded Druid Mk IV with more bass power and an improved widebander in a stumpier box for what until recently was a better price. Today the site when accessed from Switzerland shows $4.543 which isn't exactly the $2.600 it was when I was first solicited. Not sure what happened there and whether this is the price *delivered* (i.e. including shipping) to the EU - which would be first-class expedited shipping plus unless the base price too has increased.
Zu will hopefully make a public statement on this price increase (American readers apparently see $3.500).
My assumption is thus an upgraded Druid Mk IV with more bass power and an improved widebander in a stumpier box for what until recently was a better price. Today the site when accessed from Switzerland shows $4.543 which isn't exactly the $2.600 it was when I was first solicited. Not sure what happened there and whether this is the price *delivered* (i.e. including shipping) to the EU - which would be first-class expedited shipping plus unless the base price too has increased.
Zu will hopefully make a public statement on this price increase (American readers apparently see $3.500).