Anyone listen to Zu Audio's Definition Mk3?

I currently have the Def IIs. I requested and received information from Zu last week on the "Definition Mk III Transform". The work they do is extensive, much more than replacing the 10" drivers. The speaker is totally disassembled. They rematch tweeters, upgrade to a silver/oil Mundorf cap in the hi pass filter, upgrade to the latest hypex amps, all the electronics are replaced with a modular unit with new controls (sounds identical to what's in the Def IV). Additional bracing, damping and reinforcing is done to the cabinet. While I am sure there is a substantial difference between the Def II and Def IV, what I really want to know is the difference between the Def III and the Def IV. If the full Def III Transform gets me to 85% of the Def IV I believe I would be a pretty happy guy for a long time. I am hoping 213Cobra can provide that info.

Gsm18439 - the rear firing base array is not replaced as part of the Mk III upgrade. One other item of note is Zu said they would only be doing the Mk III upgrades until this fall.

I agree 100%. However, the Def III gets the new hypex amps and it looks like the same bass control package as the Def IV. I have to believe these will result in some improvements to the bass of Def II. I do not expect it to be as good as the Def IV. If 213cobra had the fully modified IIIs he will be able to provide the perspective I am looking for, if he chooses to post.

Received my Def 4s yesterday. I seriously considered upgrading my old 2s to 3s, but this thread pushed me to the 4s. As previously stated, this is a totally different speaker from the 2s. In my room there are huge improvements in all areas. The new super tweeter gets a big thumbs up from me. That along with the increased resolution from the FRDs gives you so many more spacial cues that the whole musical experience is dramatically better than the 2s. The woofer is way better also. On the down side, these things are HEAVY! I almost had a hernia getting them out of the box and set up. Of course if I would have waited for my wife to get home from work and help it would have been a lot easier, but there was no way they were going to sit in those boxes all day with me looking at them wondering how they sounded. As an FYI my 9 wpc Yamamoto 300B amp drives these with absolutely no difficulty. More to follow.

Hi Spiritofmusic,

In my system there is no loss of the "seductive Zu tone". If anything it is more dense and fleshed out due to the increased mid-range resolution and improved bass and treble. Instruments sound more natural and realistic. With these improvements I find myself listening to a lot of older, less stellar recordings and enjoying them greatly. I think you are going to like them very much. It's hard to describe how much better they are across the board than the 2s.

Regards,