Acoustic Zen, Reference 3A and ATC

I personally find the decapos to be tonally faithful based on my 3 year experience with this design, YMMV. You have to listen to speakers in a given system to gain any salt as to their intrinsic value to YOU. The DECAPOS are in my extensive experience quite special. In that I am very confident, I really love this design. Listen if you can, particularly with tubes. While not perfect, they are fundamentally just RIGHT.

Not compared myself. ATC are neutral and accurate in tone. In practice this translates as more forward midrange and less low end than most designs targeting home use (which tend to be more colourful in a way that is popular - stronger treble and bass)

I owned the de Capo BE's and now own AZ Adagios. They both do best what they do best. I would say the de Capo's are a bit more forward while the Adagios resolve better.

Either way you're going to listen to music for hours. The only reason why I moved to the Adagios ( a lateral move, really) is because we moved to a place where I could finally have a listening room that could fit floorstanders.

Another thing,
Ref 3A’s loudspeakers proclaim they are all phase coherent (basically due to a non existent crossover), so as are Acoustic Zens due to an implementation of Linkwitz - Riley type of crossover. I uderstood this well?
What about ATCs active loudspeakers with the active crossovers, can the active crossovers be equally as effective? I find this phase coherency thing important.