Originally Posted by penngray
optical drives preformance changes is because of moving parts actually, the optical part if built properly will read no matter what within its design limits. Warming up of TVs is always because of other components are in play that may have substances that change with heat (lightbulbs, gases, whatever).
I have had DVD drives that stop reading properly when used heavily for a period of time, requiring a cool-down. What the problem is I do not know.
Warming of TVs is not solely about bulb warm-up time, etc. The electronic circuitry, particularly in analog-based displays (CRT projectors especially) changes as the display warms up. Sometimes these changes can be quite significant, and they continue to drift over time as well beyond just power-up warmup time, requiring re-adjustment at least yearly.
Again, I intend to provide no ammunition for snake-oil sales, but to suggest that electronic circuits don't change with temperature, or over time does not match with my experience in video at all where these things certainly have an impact. However, the bandwidth of video circuitry is far higher, and small changes become very significant in ways that I'm sure we would agree is not significant with audio.
But to argue that electronics, being electronics, are altogether immune from temperature or drift over time universally is not accurate.
Resistors, Caps have been proven to not change in terms of SQ, there is no break-in required on any product that does not have moving parts that actually change specs with movement. Even speaker drivers have limited change and that happens over the first small amount of time.
Again, this may be fully accurate with regards to sound-audibility, but it is not accurate with regards to electronic circuitry as measured, in my experience.