I've owned ATCs. I don't now. I've owned Watt/Puppies, Apogees, Sonus Faber, Vandersteen, and Thiel. ATC active speakers are the most accurate I've heard in terms of micro-dynamics and timbre--a sax or female vocal sounds exactly like the live sound of a sax or vocalist. They also do big dynamic swings well if you have the 100s or larger 150s. The Meridians are a great engineering idea that just doesn't pan out to my ears.
Opinions please Meridian vs ATC active speakers
I have all M33 active speakers in my home theater and in my bedroom and in my computer room and I just love the sound of these. Active speakers are my favorite as I have noticed them to reach higher sonic levels at far less distortion and fatigue levels. I am getting ready to upgrade to large speakers now and wonder what you all think about the meridians compared to the ATC's. Thanks