I agree with Dgarretson. I just had Jim Smith voice my system. He did not want to do any serious listening until his DAC had been plugged in and powered on overnight and was quite warm. He even had it charging in the car ride from the airport.
My CDP does sound better when warmed up for a few hours. So do my Pass amps which I turn on two hours before I listen. My preamp and phono amp are always on.
I have also found that my analog front end sounds better after about 30 minutes or 1-2 sides. This is the cartridge suspension getting loose. Heat and humidity also have an effect. At least in my system, all of these things seem to make a difference.
My CDP does sound better when warmed up for a few hours. So do my Pass amps which I turn on two hours before I listen. My preamp and phono amp are always on.
I have also found that my analog front end sounds better after about 30 minutes or 1-2 sides. This is the cartridge suspension getting loose. Heat and humidity also have an effect. At least in my system, all of these things seem to make a difference.