Anyone listen to Zu Audio's Definition Mk3?

I am also curious about difference between Omen Def, Superfly, and Druid V.

It also seems the superfly has gone down in sensitivity (100 db/w) with nano-driver than it was before.

pity

There should be a bit different dispersion pattern between Druid and Superfly I would guess since the height and tweeter placement are quite different.

Gopher did you upgrade your tweeters as well? If not why not? I in possession of a pair of Definitions and would like to do the same upgrade.

I did not. I already had definition 2 speakers in the first place, and this is the same tweeter/cap the def 3 employs to my understanding.

I'm not a hundred percent sold on the driver swap yet to he honest. I hear the technical improvements but I've lost my system synergy I was just establishing with my new to me def 2s and am hoping I didn't make a mistake jumping the gun and returning my drivers.

I've been speaking to Phil a good bit behind the scenes and I'm optimistic a couple tube changes can rest my synergy... accordingly I have some 211b tubes on their way... until then, I'm slightly nervous.

Def2 had a slightly reticent character compared to Def1.5 before it. Simply installing the nano FRD or even the 2010 HO FRD to stock Def2 shifts the presentation of the speaker to a more vivid, forward sound comparatively. This is good from an ultimate fidelity standpoint but whether one likes it better without going all the way to Def4 and the benefits of the Radian 850 and cabinet improvements is quite subjective. The major revisions to Definitions from Def1.5>Def2 in cabinet construction especially made Def2 the most forgiving of the Definition versions until Def4.

Putting the hotter FRDs in Def2s change the sound profile enough that if you do it, you should plan on having to work back through the gear chain prepared to make one or more adjustments. It could be minor, like changing tubes or it could be major, perhaps changing power amp or DAC. These speaker models are integrated designs so making incremental sub-assembly upgrades necessarily disrupts a balance intentionally achieved earlier. Also the newer FRDs take lots of time to settle in.

I am sure Gopher's concerns will end and he will get back his briefly-achieved system synergy. Some patience and experimentation will be needed to pin it. Going from Def2>Def4 I changed my preamp, for example. There was nothing wrong with my Klimo Merlino Gold +, but it's slight forwardness which was so complementary to Def2 was not quite as well matched to the midrange of Def4 as my Melody Pure Black 101 -- *in my room*. Point is, there are some general guidelines for making these incremental upgrades work, but you really dial them in by working with the specific context of your room, system components and your own emotional triggers for satisfaction.

I got but did not choose to upgrade my Def2s with the 2010 HO FRD, for example, because after having extensive exposure to a friend's Def2s that were built with HO drivers I concluded that in my room I was better off waiting for Def4. In Gopher's case I know that specifically putting nano FRDs in Def2s will remove Def2's forgiveness of the glare in the "A" version of the 211 or 845 power tube. It's his place to start the upstream adjustments.

Phil