Can temperature fluctuations affect audio gear?

The mention of temperature in literature is really for extreme cold. If a very cold piece of electronics is brought into a warm room, it will condense moisture out of the air on ALL the electronis inside. You want to wait until this condensation goes away before turning it on.
That is the primary reason for the warning.
So if the stuff is the same temperature as the environment, that warning doess not apply.
Enjoy.

I agree with Elizabeth. I wouldn't worry about the possibility of damage, if that was the point to your question.

I would add, though, that from a technical standpoint it does seem conceivable to me that a 25 or 30 degreeF difference in ambient temperature could result in sonic differences, at least to a subtle degree. But I would expect those differences, if any, to be equipment-dependent and unpredictable.

Also, it wouldn't surprise me if a temperature difference of that magnitude caused differences in your own hearing mechanisms as well. :-)

Regards,
-- Al

If you plan on using the system,I would open the door,and blow a fan on it(system),while it warms up.Maybe a hour,or so first.The warm humid air from downstairs,plus your humidity might cause condensation in them,if it gets fairly cool.

The amount of heat your gear will 'give up' to the environment is related to the difference in temp. If your amp runs at 100f in a 100f room, very little heat will be transferred. In a 65f room, you've got no problems.

During the hot part of the year, at least make sure you are well ventilated or perhaps even install a fan near any hot gear.....But be careful not to just blow at hot stuff, if you restrict the natural convection, you could possibly even make something run warmer...while trying to cool it. Any fan I place is above the hot piece and blowing AWAY to suck air thru the piece and allow 'nature' to do its work.

And from our FWIW department, those nutty radio astronomers run their amplifiers and much electronics in a liquid nitrogen bath at colder than -320f.
This is to reduce the 'thermal' noise of atoms bumping into one another. In the very highest resolution systems this may make a difference. Or not. LOL.

Other temp effects may be on the speakers where characteristics of some synthetics....perhaps woof cones, may change from the coldest to warmest temps encountered. I'd also suspect greater power handling capacity in the coldest weather. The voice coils will cool much better.

12-03-10: Magfan
The amount of heat your gear will 'give up' to the environment is related to the difference in temp. If your amp runs at 100f in a 100f room, very little heat will be transferred. In a 65f room, you've got no problems.
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Maybe you were trying to say something else, but it didn't come out right. The electronics will essentially be at a constant delta above room ambient (more or less). If your amp runs at 100F when the room is 100F, it means that at 65F room, the amp would run at 65F. Of course, that isn't going to happen.

If the amp is at 100F when the room is at 65F, then when the room is at 100F, the amp will be at 135F. The heat transfer is constant, that's why the amp runs at a constant delta T above ambient.