Very nice system and I think the atc 50's would work really well with it. They are a considerably better speaker than the 40's and imo is where the magic starts with atc.
Good reference material would be those with multiple instruments playing progressively louder going into a crescendo finale e.g. Pat Metheny Group's Minuano. To unravel what each instrument is doing and separate them in space is the ultimate experience in audio.
Nice speaker but the choice of music is not ideal for a review. There is almost on variation of a (flat) vocal until the 3:45 timestamp. This thing is expensive and most people want to hear its capabilities before purchase. There a quite a few speakers that do the "80%" performance of this speaker for a third of the price. The curious want to know what the final 20% performance is like. But, totally appreciate the effort to put this our there - something better than nothing I guess. When ready I am going to take the "test" music to a dealer and get the answers. Thanks!
your not get the best until you hear and have the active crossover version , then you will hear more inner details and dynamics than the passive version can't never hope to deliver , no matter what powerful so called high end amplification is used in passive driven form 🤔 🙄