Best Pre/Amp or Integrated for Zu Essence

ARC is very transparent and can give you that in the room experience with the right cables, etc. I can't say that I would personally go with an ARC/ZU combination because both have a very extended top end. Maybe too much of a good thing IMO??

I found the ribbon of the Essence bright with a VAC tube amp so for me, I would look for something rolled off and give up a little of the top end characteristics, but it seems we have different priorities. Also found a Luxman with EL84's (great little 8 watt amp)bright with the Zu's.

Throw a Mastersound 300B amp on your radar too. It would have to be used but I wouldn't worry too much about that.

Bjesien, thanks for the info. Very helpful. Based on the feedback so far, I am leaning toward either the Cary 300SEI, the Audio Electronics gear, or the Quad gear. I am familiar with the Quad house sound, but haven't heard these units in particular. Sounds like the Audio Electronic gear wouldn't be that bad either since it uses EL-34 tubes, and I guess it doesn't get much more buttery than the 300 SEI.

I am a little concerned about a 300SEI as I have heard they can sound a little "slow". I've heard that the Quad gear is particularly great in the midrange with a decent foundation. My understanding is the the Audio Electronics gear has a very "meat-on-the-bones" presentation-- lots of weight.

I am most concerned about dynamics-- the snap of a snare or the leading edge of a trumpet, for example. I don't want an amp that is too soft in this regard.

I have also found the Essence to be a little bright in the range of the supertweeter. Too extended with inexpensive solid-state gear. Not that bad with the Elicit, but definitely fatiguing with my Cambridge 340A that is in place while the phono card is being checked in the Elicit. Using the tone controls on the Cambridge unit works well to deal with it. Also, toeing out the speakers helps as well. I pretty much have the speaker placement figured out.

PMB

- threat 1st reflections on your side wall with acoustic threatment. Wall directly behind the speakers could possibly use some acoustic treatment as well. In your case, absorbtion should work better then diffusion to help with high freq. It doesn't have to be necessarily a professional product. Common household item works and can be used as substitution for pro grade treatments.
- use copper wire for speaker hook up and interconnect.
- do not aim tweeters directly at your listening position.
- amps that are reported to work with Zu speakers are listed on their website. But you can also look at these:
Solid state - Nelson Pass, Dayens Ampino integrated amp, RWA, Modwright.
Tube - Atmasphere, Melody and others.

I personally will use custom 300b PSE monos but Cary you mentioned should be a fine choice as well. Also check out 300b Audiospace integrated or Manley Labs.

Used Canary CA-306 would, I imagine sound awesome with the Zu's. 24wpc of 300B push/pull power.
I have Canary 339's and they sound unbelievable driving a pair of Tekton Uruz speakers which are VERY similar in design to the Zu's.

Preamps from Supratek, Modwright, Dodd Audio and few others work wonders, however. Integrated amp might be the answer.
If you end up with extra funds, try external DAC with your source (not that there is anything wrong with it). That might also help out with overall sound characteristics/presentation. NOS DACs are usually thought as "musical" as opposed to sterile, hifi-ish sounding. Presentation of these DACs is usually warmer, a bit recessed, more analogue sounding but often compromised by lock of resolution and detail retrieval. Ofcause this is broad generalization and there are exceptions to this description.
If you can find manufacturer or dealer to provide a demo unit or offer in home trial, I'll say go for it and educate yourself with what's out there as far as digital reproduction is concern. Few ideas - RWA, Wyred, Lampizator DAC, Tranquility DAC (if you want to try USB audio done right) and few other that escape me at the moment. I believe all these brands offer in home trial.

And finally........
Good luck and have fun