Zu audio advice

I like the Lore with the blue main driver and cool looking gold metal tweeter…98 db efficiency? You could drive it with thoughts from your head. Nice. Less expensive than Zu.

I lived with the Omen Mk. I for a couple of years. Strength was speed (dynamics) and satisfyingly thick and meaty tone. Weakness was imaging: when most of the information is coming from a 10’ driver, it won’t disappear in the room. There is still a stereophonic effect, but I’m not sure they will ever do the holographic imaging thing.

It also likes power and may not be quite as efficient as claimed.  38 watts of tube power was enough, but I don't think an SET would have brought them to life.

Have a pair of Zu Def 4s. If you like tubes, and I do, they can absolutely sing. Have heard that the DruidV is another winner but wouldn't trade. Above poster is right about placement, took some experimenting. Also took some break in time. 
Only problem is I can't stay out of the basement. 
Go to the Roundup thread. Just type in roundup.

I agree with DentDog regarding Zu Def 4s. (No, I have not spent time with other Zu speakers.) In part, the Def 4s take on the character of the amplifier that is driving them. I have heard them with SET, low powered SIT, and even moderate powered SS. While some individuals think that most SETs are underpowered (search for posts by 213Cobra - he uses an 845 SET), I am quite happy with my 300b SET. Conversely, I thought that both 45 and 2a3 SETs were insufficient - although I have very long speaker cable runs that might have contributed. I did not fuss with placement for two reasons - mostly because there were not a lot of options in my living room.