Id say decapo image better, but tonally I prefer scm7. the decapo had some forwardness and something I found bright in the treble/upper mid
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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.
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.
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.
Many claim to be "phase correct" but all they really do is have all drivers in the same polarity. This does not guarantee the speaker to be time and phase correct if fact they rarely are. The only way to know is to look for the triangular step response in the Stereophile measurements.
In terms truth of tonality and overall music reproduction ATC is among the absolute best. It is a true reference if you want to hear the tone and timbre of an instrument or voices. The active version is in fact spectacular. I cannot see any reason why anyone buys a passive ATC because in its active avatar it sounds far superior to any passive ATC + amp combo.
Acoustic Zen is among the most colored speaker of the three, so take your pick.
I don't think any of these speakers are particularly colored in the midrange and all are great in their own way. But there will be differences in how they present the mids and the overall sonic picture. If you're into soundstaging and, in particular, 3D imaging (think more of a "you are there" presentation) I'd lean toward Ref 3a. If midrange dynamics and impact are more important to you (think "they are here" presentation) I've not heard better than ATC. A major consideration is what equipment you'll be driving the speakers with, which will also be a main contributor to having listener fatigue or not. ATCs generally need more power to open up and sound their best where Ref 3as present a relatively easier load and require less power. I haven't heard the AZs so can't comment, but I'd guess they're somewhere between the two. Others I'd consider are Joseph Audio, Vandersteen, and ProAc. All great speakers. Hope this helps and best of luck.