Anyone listen to Zu Audio's Definition Mk3?

Charles, the 6Moons preview of the Druid V makes special mention of possible upgrading in SQ by substituting caps, from the stock Clarity Cap, thru the Intertechnik Audyn Copper to the Duelund Black. Consensus was that the Duelund is the way to go, although the Audyn well outperformed the stock cap. Really feeling this is the next place to go re upgrading.
Is the Duelund Black the same as your Duelund Cast Copper?

Spirit,
Here`s the pecking order.
1)CAST, Silver foil(uber expensive!)
2)CAST, copper foil(expensuve)
3)VSF Black, Silver or copper
4)VSF, Silver or copper
5)Alexander, entry level
Given the cost of your Zu DEF IV. and the level and cost of your system, I`d go with the CAST copper and be done with it. No 2nd guessing, CAST are made for high caliber systems,get the best.My Coincident speaker is very good but the CAST simply raises it to a higher performance level. You won`t regret this capacitor improvement.
Regards,

Charles, a pair of CAST Cu amount to about 10% the price off the spkrs, whereas CAST Ag appear to be special order everywhere, price TBA, my guess is maybe 2-3x the price.
You seem v. happy with the Cu, and I'm sure Sean of Zu will concur with you.
Unless he gives me a compelling reason to go down the Ag route, it seems that Cu will be it.

I went back almost a year's worth of Phil and other Zubie Def4 posts. I'm more than excited about the idea of the 4s I already own the Ibis so Zu will reterminate for free. Now it's time to work on the wife.

Warrenh, I can assure you, you WON'T be dissapointed. Whether you can smooth it over with the wife, that's another matter, the best of luck. You could always say it'll maintain your sanity in the twilight years making your relationship trouble free for years to come. Be prepared to buy her a bit of what she wants however.
Seriously, I stand by every word of my multi part review a few posts back, with the added comments that my indifference over the tweeter is fully resolved. The only down side is a tendency to bring out any OCD issues you may have - the 4s are such a transparent transducer that any changes you make will be fully heard, and of course this can go in the wrong as well as right direction. I'm finding toe in, bass adjustments on the spkr, and component supports/isolation (my choice is Symposium) making massive gains in SQ. I'm often 'in the zone' now, and I really feel this is one aspect of the upgrade merry-go-round I'm happy stepping off.