I was an ATC fanboy for a long time. Fantastic speakers.
The one caveat with them I'd say is they like to play LOUD. Like, the louder you play them, the better they sound. They only sound their best when played at "realistic" volume - i.e. the same volume as the original sound. If you listen at lower volumes they can sound underwhelming.
They're also very neutral, so if you like a bit of warmth to your sound, you'll have to partner upstream equipment very carefully. (They're also extremely transparent though - if your upstream gear is warm, they'll sound warm.)
Oh, and the active speakers are sensitive to output impedance of the preamp used, so you have to take some care there - an impedance mismatch will lead to frustration.
The one caveat with them I'd say is they like to play LOUD. Like, the louder you play them, the better they sound. They only sound their best when played at "realistic" volume - i.e. the same volume as the original sound. If you listen at lower volumes they can sound underwhelming.
They're also very neutral, so if you like a bit of warmth to your sound, you'll have to partner upstream equipment very carefully. (They're also extremely transparent though - if your upstream gear is warm, they'll sound warm.)
Oh, and the active speakers are sensitive to output impedance of the preamp used, so you have to take some care there - an impedance mismatch will lead to frustration.