Hey Marcvs,  the ZP3 likes to see 47K ohm  2V input (2V for full gain).
So if your SUT will output the above all should work very well together.

The ZP3 HAS a 47K input impedance and likes to see 4-5mv input voltage to output a 2V source (which your Mini would want), it does not want a 2V input voltage like Ace said.  He is mostly likely think about a Dec. amp. not the Phono.  
 Most all SUTs assume a 47K load at the input of the Phono because that is the de-facto standard MM input load on all MM Phono's.  I would have to assume the a23 is no different.
 I tried to look up the transformer specs used in the A23 but they are no where to be found, as you said.   Regardless,  I'm going to say that the A23 will work just fine with the ZP3.  The only area you could possibly have any issue with is gain (output from the ZP3 to Mini).  Depending upon the how much the A23 'steps up' the output of your cart (unknown with knowing the coil ratio),  running the ZP3 directly into the Mini it may not be enough.
  For example,  I run a SoundSmith Zephyr MIMC that has a .04mv output.  It connects into a SUT that is configured to give me about ~20db of gain.  If I were going directly into my Dec. amp (requiring ~2V for full output),  it would NOT be enough to get full volume out of the amp (close but not enough).   However I run into a Pre first and it is able to make up the extra gain I need,  so this could easily be your case as well,  especially since the DL-103 is a little bit lower output then my Zephyr.
 Hope this helps,  unfortunately not a clear cut answer since the winding ratio on the A23 is unknown.   Just know it will def. work, you just may not be able to drive the amp to full volume (most likely wont be able to).

Hey Archie,  I did not look at the ZP3 output spec before I posted (but should have),.  It is posted as 41db of gain  (not a specific V out which would certainly be dependent on the source driving it).   I guess I was assuming that since most of Steve's amps are in the 1.5-2V sensitivity range that for a typical 5mv cart input you would get an output in the ~1.5V range.   Should have done my math first.  
   Regardless though,  you are correct with your math.  I do get .56V for a 5mv input at 41db of gain.  Not a 100% sure on your discrepancy though.  Possible that the carts are outputting a slightly different amount than the pub. spec.
 I too ran my .04mv cart straight into the ZP3 (just to see) and yes,  while the gain can be made up with a traditional Preamp, like you found out there is a lot of inherent tube/circuit noise that gets revealed in the process.   Like everything in this hobby, especially when your components have sensitivity specs,  working or not depends on a lot and on match up those sensitivites.    Speaker, amp, pre sensitivity are all going to play a big role.
 My thought is that the ZP3 will work best with carts @ 5mv of output and an amp that is on the higher sensitivity side,  certainly no lower than 1.5V (ie, <1.5V) for full output.    In so many cases,  we rarely listen to 'full' output though so I imagine that the less than ideal or matching specs on paper don't really always come into play,  though if you can match it up proper then it will definitely benefit the noise floor coming from the ZP3 as we both know.     Check out the following link.  It has some good calculators and ratio descriptions,..
http://www.sengpielaudio.com/calculator-gainloss.htm

I'm out of my element with most of what your link was about.  I wouldn't be surprised if Steve would have like the ZP3 to higher output but from reading his development papers I think he was happy to get 42db with low noise.  I think the ZP2 may have been more like 35db.  I find having the CSP3 very important to make up some of the deficiency, especially since my cart of choice is putting out only 0.35mV.  Without it I couldn't run my ZMA at full output.

If I understand the ZMC1 correctly, the variable impedance really makes it nice since there doesn't need to be a close match between SUT and cart.  I've only used mine with 3 different Ortofon MC carts but they've all sounded great with it.  

I use a ZSTAGE to boost my ZP3 to match other inputs into my ZTpre.

That's great Marcvs66.  Always nice when you can try something out like that.  The Omens are great speakers.  I have a highly modified pair that I LOVE!  Their high sensitivity really helps when things like the sensitivity of other equipment is maybe not as matched as you would like.  I have no doubt that the A23 will work great for you.  If I had to guess I would say the ratio is at least 1:10  but probably a touch higher which will certainly be in your favor!

I had the original Omens, so some of these mods are already incorporated into your MKII's. (asd1001, t-nuts, foam padding behind FRD)  what I did was all at Sean Casey's direction....  

1. 1" Oak dowel between the 2 drivers & back wall (weak spot on the front baffle)
2. Druid V/Def.  drivers (FR103ND) & ASD1001 and added the t-nuts to the cabnet.
3. replaced woolish driver damping with foam blocks
3. Event cabling harness (internal)
4. full length Fiberglass wrapped dowels (ZU R&D from Druide VI) epoxyed/glassed into all 4 verticle corners
5. attached/gapped butcher blocks to the base

All in all I would have to say the FR103ND Drivers,  front>back dowel, and ridigly attached butcher block base made a tremondous difference.  Alot of this was done over years of time.  The f>b dowell between the 2 drivers really helps alot. and was one of my first mods..  The last was the attachment of the bases.  I had been sitting the speakers on them to good effect but attaching them really tightened up the low end.  Cummlatively everything really compliments the speakers as a whole and I couldn't be more pleased.   I had toyed with buying a pair of Soul Supremes and when talking to Sean,  he said 'if you don't mind doing a little work,  I can get you 95% there for 1/4 of the $',..  that last 5% being the Radian tweeter used in the Druids and Supreme's,..   The 'Super' Omens now are really notthing like an Omen and are more of a cross between a Druid V/Soul Superfly in an Omen shaped box that makes them pretty unique!  

jslateiv.

thanks for above posts - extremely interesting! I sent you a PM.