Broken in at about 100 hours but continued to have smaller changes until 200 hours, then opened up, bass released, deeper, more relaxed/easily sustained.
I got the timbre reproduction right from the beginning but it's more subtle now, better, with nuances coming through on some albums I hadn't noticed before.
I've got them about 9 feet apart, slightly towed in and my listening chair about 11 feet back. I've been edging them outward to see if the equilateral golden ratio works in my room. They keep throwing a big open soundstage with effects outside of the boundaries of left and right.
I can listen to them a lower volumes and still be very pleased with the balance, detail and timbre. I've added a small 8" auto EQ Velodyne sub for Rock but I find it integrates well just underpinning frequencies below 40 Hz. I don't use it much for my well recorded jazz albums.
With the A6r going a half octave below mine under normal circumstances I would guess the sub would never come into play.