Last month I set up a second new system for my sister and decided on the Heresy IV's to fill her large open room with 16 foot ceilings. The larger Cornwall IV's size scared her. I added a sub to help the bottom end and finalized a 60hz crossover using the high level (speaker level) connection to both speakers. She wanted ease of use and decided on the Naim Uniti Atom with only 40 watts. This works well for her and Roon responds fast even with Wi-Fi. Her previous speakers SF Domus Concerto were too weak for her big room and didn't play well at low volume.
The Heresy IV's are not harsh to her, just clean, clear, dynamic, good imaging with great sound playing quietly or blasting the house effortlessly without any distortion.
The Hersey's respond well with good quality components.
Speaker room setup is a vital step for good sound. Here's Dan's report
https://www.audioaficionado.org/showthread.php?t=46634