From what I gather, it appears that the Essence (more than the other Zu's) should be paired with a tube amp. I can state from experience that this is some extra "sparkle" when partnered with solid-state gear. That said, with toe-in limited so that the tweeters' axis converge behind the listener lead to a much more balanced sound. The "cuppiness" that some experience or point goes away with Libtec cables and proper toe-in. It is definitely there without proper toe-in. Also, moving to Mission cables from Gede cables helps tame the ribbon.
Can't speak to the Soul or SoulSuperFly. I also suspect that the impedance interaction with a suitably powered SET amp will improve the integration of the ribbon.
I would love to hear other's comments on any of the new Zu' and partnering amps. I was going with Quad amps but have decided on Manley 300B SE/PP monoblocks instead.
PMB
Can't speak to the Soul or SoulSuperFly. I also suspect that the impedance interaction with a suitably powered SET amp will improve the integration of the ribbon.
I would love to hear other's comments on any of the new Zu' and partnering amps. I was going with Quad amps but have decided on Manley 300B SE/PP monoblocks instead.
PMB