Even though I'm the longest term booster for Zu on WBF, and probably in the whole history of social media LOL, I'm probably the one who's been least adept at getting them right.
KeithR claims he sorted his pair on the first day. Well, my first day was in August 2008...so what does that say about me?!
Phil here also is strongly of the opinion they're pretty good straight out of their shipping cartons, and reasonably system- and room-agnostic.
Both Keith and Phil don't quite get why it's taken me so long, w such attention to tweaks and ancilliaries.
All I can say is I latched on early to the Zu sucker one-two punch of tone density and dynamic shove, which is evident immediately on demo and in all rooms (and convinced me to scrap my way more neutral ProAcs for), that absolutely brought to life all my challenging prog and fusion, way more than other spkrs I heard at the time (and still to this day).
And certain shortcomings in absolute transparency, neutrality, air and microdynamics became apparent later (as a certain veiling and upper bass opaqueness), that precluded full engagement w vocals, jazz and esp classical.
Now this was only partially a Zu issue. At that point, I hadn't really dialled my analog in, so it was only firing at 60%, my cdp was a tad grey thru the mids...and critically, my room and power was a bitch, contributing to a hard, vague, grainy sound, that only my move here was able to be revealed as a comparison.
To Ked's credit, he picked up on this immediately, and so while I had "tunnel hearing" ie only latching onto Zu positives on playing Rush and Magma and Porcupine Tree, he was castigating how bad Mahler sounded there.
Consistent w criticisms from others, incl Blue58.
However, was the Zu DNA absolutely worth sticking with, or time to change on coming here?
I had a decision to make...put a £50k budget twds new spkrs and use a bog standard 18x12x8 room. Or put that budget into creating the 18x48x9 space in the loft, and wrangle a better sound w the Zus.
I missed a chance to hear User211's modded Apogee Duettas at the time. If I had done, having heard them subsequently, I'd have commisioned a pr, most suitable amps, and Zus would have been history. They I'm sure would have been great in that smaller room. I was borderline considering AG Duos XD and some quieter tubes as well.
For many reasons, those options didn't happen, 12 months of audio quarantine, fired up the Zus in the new space, random non optimised setup...expecting nothing good because of my growing fears the space was gonna be worse than my last one, and the stress of the move and having zero cash in the bank...and to find that just moments in, two firm conclusions could be drawn.
First, room acoustics are beyond critical. How the exact same system in a different room could be so radically different is almost impossible to convey. And cemented by the fact that the last thing I've done acoustically 3 wks ago, simply filling a 12 cub ft hatchway void, has liberated a whole new level of goodness. One pack of acoustic Rockwool, £50...miraculous.
Secondly, my Zus were hampered before. With no other system changes, they were revealed to be way more open, delicate and neutral than I'd ever suspected...way closer to Phil's take on them. And hugely responsive to attention to them, the other gear, and system-wide tweaks.
So, sorting their own Revopods footers isolation, Stacore tt isolation and bespoke Straingauge cart LPS, quieter tubes and impvd DB25 cbl in preamp, full Sablon loom, beefiest Westwick balanced pwr and Oyaides/Furutech dedicated lines/duplexes, SR fuses, full Symposium isolation to gear...and fetishistic attention to tt/arm mods and optimal analog setup, and Zus positioning/listening distance/optimal subs settings.
Throwing in these last changes since lockdown, ie filling the hatch and left field use of lp periphery ring, has got me to a point now that classical and jazz are the FIRST lps I reach for. Yes, Zus still don't nail that very last degree of uber lack of character and mega transparency/neutrality. But they come way closer than my first 8 years of ownership ever suggested. And I can truly call them genre agnostic, even handed, delicate...while maintaining 100% of that core Zu DNA that still makes then top 5 spkr on the mkt for Rush, Magma, Porcupine Tree.