My JC1’s live in standby, and they start to sound their best about 1 hour into a listening session starting at 5:30 on a Friday evening. A Sunday morning with JS Bach is sublime at about 6am, with about a ½ hour of playing time. I suspect it’s a combination of time of day/power grid activity and transistor temperature stabilization. Most natural phenomena have several factors operating simultaneously. Science is so... complicated.
Amplifier warm up
I was plalying Boz Scaggs, "Silk Degrees" LP. After side one, I ate dinner. One hour later I played side 2. The second side sounded clearer, more vibrant with better sound stage. I have a Parasound P6 preamp and Parasound Halo A21+ amp. Is it possible that an hour of warm up improved performance?