Which speaker among Dali, Dynaudio and Acoustic Energy should I choose?

I have the Dali Rubicon 2's and they are wonderful. 

Just my two cents..

Good luck!

I hate to say but I wouldn't do any of these.  You have a pure Class A to 20 watts.  I would be searching for higher sensitivity.  The highest sensitivity you have listed is the Acoustic Energy Reference 3 at 90 db/.  The Dali is 88.5 and the Dynaudio is 86.  To push them to greater listening volume you will be dipping into the A/B segment of the amp.  Might try the AER 3's and see how they sound with your amp first.  This is just my humble opinion but I believe you would be happier with a 95 db or higher sensitivity to leave the amp as a true class A at good listening volume. 

Look for 90 dB sensitivity at a minimum with 20W of Class A.

You will not be happy with anything on your list. Dark and muddy.

@hoosierinohio
@chicagoblue1977

Thanks for the advice, Never really did make the connection between Class A and low dB. There must be some truth to it given that both of you advocate against it.

That Dali Rubicon 6 is no slouch.  I heard them at a dealer in Dallas and was very impressed with their hybrid tweeter module. Another thing I liked about them is that they have nice, articulate bass and did not seem to have a mid-bass "hump", which some speakers employ to make you think they have more/deeper bass than they actually have.  88.5 dB sensitivity doesn't seem that low to me, if you have 140 wpc on hand.

"You will not be happy with anything on your list. Dark and muddy".

That's a crock. So you are saying anything but Class A will be dark and muddy? Sorry but my Class D PS Audio amplifier sounds magnificent, and not 1 watt of it is Class A. 

These are to be driven by a hybrid integrated amplifier which outputs the firstt 20W in Class A and up to 140W in Class A/B.

If the numbers are conservative (the amp tested to deliver 140W if not more in real world), the amp would do fine driving all your speaker options. Not all amps are the same as the power supply will also matter.

Personally I would be more inclined to go with either Dali or Dynaudio if an audition is not possible.

Not what was said there @grunge100 the more sensitive the speaker the easier just never mind. Stick to your class D stuff. With 88 dB you seem like you enjoy the mud. 

I don't know that you'll be able to hear the difference if your amp transmission's from A to A/B, I never could with my  Parasound or Pass amps.

I love my DALI Zensors that are driven by D-Class amplifiers, but then I've upgraded the crossovers with Mundorf capacitors and replaced the elementary wadding that doesn't even cover all surfaces with Mundorf Twaron Angel Hair Filling.

I'm not even going to ever consider replacing them!

If you can cope with a soldering iron the improvement is well the effort. Even if you can't, the Angel Hair is well worth doing. 

Your amp should do well with any of the 3 speakers you pick. Unfortunately we can’t tell you what you’re going to like better.

Hi @ertorque,

I have both Dali and Dynaudio - HUGE fan of the Danish sound! Just like Santa's elves were born natural toymakers, the Danes are natural born speaker makers:)  My main HT/music system I have Dynaudio Evokes with the 50's anchoring. I moved to Evoke from Excite. I have had the Excite 34's and then 38's previously. I honestly find the Evoke's more on the warmer side than Excite. Weirdly as I never ever thought I'd find anything Dynaudio on the bright side I found the Excite's to be leaning a bit that way. If at all possible I would recommend Evoke over Excite - sorry to throw that curve at you but this was my personal experience and I am just LOVING my Evokes.

I have the Dali Oberon 7's in my formal living room and I love them - very similar to Dynaudio, again that Danish sound that I love - airy, detailed, warm. I also have the Dali Zensor 5's in my bedroom. Same thing but not nearly as "full" sounding as the Oberon's...

I have never ever heard the AE's. But I found way back when when I started out that the Dynaudio sound was for me - same with Dali. Between the 2 I would choose the Dali Rubicon 6 over Excite 34 (I think you'll get a fuller sound as well with the Rubicon's). But I would choose Evoke over Rubicon. You cannot go wrong with either. But one thing, both speakers LOVE power the more clean power you give them the more you will be rewarded. 

Btw, I am driving the Evokes with a Simaudio Titan and the Oberon's with a Parasound 2125 V2 - both have PLENTY of juice to get the most out of them..

Good luck and let us know what you end up doing...

To clarify, based on some of the comments.  Yes, the amp will more than drive any of these speakers and sound great.  All the speakers mentioned are good.  That said, its about finding the best speakers for equipment you already have.  I agree with kingbr, he's driving with lots more watts and they sound great, not good.  You have to match the amp to the speakers and that amp is not the "best" match to make those specific speakers sing and curl your toes.  When spending thousands of dollars, do it once, do it right.  You might want to call the amp maker and ask what speakers they recommend or what sensitivity.  Just my opinion.  Those that disagree, will still disagree.  Let your ears decide.  Good hunting.

My amp and speakers sound wonderful TO ME!!

Mud is in the eye or rather ear of the beholder!

The Acoustic Energy Refs are the way to go. They are the most sensitive of the lot and have the most thoughtful engineering. The Vifa tweeter is excellent.  I really think you should listen to and look closely at any speaker you plan on buying.  

Not that this matters, but Dynaudio Focus XD 20 would produce amazing sound for the same price as Evoke 20 + amp. Evokes are a beautiful Danish sound, but the integrated fulsome sound of active speakers is gorgeous. Focus XD is up there. 

The ones that sound best to you

These were my listening notes on the Dynaudio Excite X34 when I was speaker shopping last year:

Dynaudio X34 Excite: ($1995): Looser especially in the low end than the Monitor Audio Silver 300 and the Audio Physic Sparta. Plays rhythms much more clearly than the Rega RX-3. Bass is pretty deeper, but less well controlled (with my amp?). Rolled off a bit in the high frequencies for greater smoothness? Bass sounded a little loose...might need more attention to placement? Great rock speakers. A little loose in the bass for classical music.

Summary:  The sound felt a little loose and not so well controlled, but worked great for rock and metal.

Thanks to everyone who responded (the beauty of online forum!).  Yes, nothing beats actually listening to the speakers to know how they sound. I guess I'd have to wait until this pandemic situation eases to a point where travel restrictions is lifted here.
Anyway, responses from a few of you about speakers SPL and keeping the amp running in Class A (up to 20W) have prompted me to dig in a bit deeper on the calculation.
It seems the SPL level of the 3 speakers are rated based on per 2.83V, not per Watt. 
Rubicon 6/ 4 ohms / 88.5 dB
Dynaudio Excite34 / 8 ohms / 86 dB
Acoustic Energy Ref 3 / 6 ohms / 90dB

Converting those figures to per watt equivalent where nominal impedance is factored in, the figures per Watt per meter would be
Rubicon - 85.5 dB
Dynaudio - 86 dB
AEnergy - 88.7 dB

The Rubicon would be the one that produces the lowest sound pressure per watt.
Just sharing!
https://benchmarkmedia.com/blogs/application_notes/speaker-efficiency-and-amplifier-power