Anyone listen to Zu Audio's Definition Mk3?

Phil, I'm glad you stress the neutrality of the Event B3 SpeakOn cable. I'm finding more and more that neutrality and speed are what I'm looking for. My tube pre/ss pow Hovland combination will benefit from it I'm confident going into the Def4s.
Can you comment any further on the upgrade to the structure of the speaker? It sure seems beefed up wrt to the Def2s. From what I gather the front baffle and base plate the super tweeter and sub woofer drive unit are fixed to are pretty substantial and contribute to the improved sound quality.

There is further bracing of the Def2 cabinet internally to make it a Def3, and some added quieting of the structure. But Def3 does not get the immense stiffening of the front baffle resulting from the inclusion of the compression-mounted Radian 850 super-tweeter. I haven't seen the internal drawings of the cabinet mods to create Def3s from Def2s.

Def4 on the other hand is a completely new internal structure, with FRDs in a mini-Griewe chamber, the structural stiffening of the front baffle by the massive Radian compression structure, and the whole speaker being mechanically anchored by the super-stiff machined-aluminum plinth to which the down-firing cast-basket 12" sub is bolted. The internal wood plates forming the Griewe load slash remaining cabinet talk and arrest booming by the tall sidewalls. The FRDs are isolated internally from the subwoofer chamber. So you have the speaker bisected into two very strong boxes within the tower, on that massive machined aluminum foundation.

Phil

Thanks again Phil, your informed comments on the Def4s are really filling me with supreme confidence that when mine are installed in 4-6 weeks, I'm going to get that step up in performance from the Def2s.

I'm excited and optimistic as well. My nanotech drivers are out for delivery now, though I'm out of town and won't be able to install them till Sunday night.

Welp... I returned from out of town this evening and my nanotech drivers were waiting for me. Like a good addict, I went to work swapping the original def 2 drivers out with these things and am pleased to report the job was completed with no major casualties...

First impressions of the new drivers is that they resolve a lot more information. There is so much more detail to music without coming off analytical, but rather more delicate. Tonality seems great and strings are just great and, while stage is a bit constricted/compressed I think with burn in these drivers will be exceptional in my system.

Can't wait to hear things mature/develop.