Do speakers take time to warm up?

Once broken in from new, the only break in would be as mentioned here, just a short time to get the crossovers used.

 New speakers (mine) took about 250-300 hours to loosen up the surrounds etc etc.

once broken,in a short time they will be just fine

My mid-range and tweeters have ferrofluid.  I suspect that warm or hot ferrofluid behaves differently than cold ferrofluid.  Also hot speaker coils have higher resistance.  For copper it would be 4% for every 10degC.  Drop in power is negligible, but increase in resistance might affect crossover points.

Most speakers I’ve owned have sounded better after playing for fifteen minutes to half an hour or so from stone cold, depending on volume. This applies with fully warmed up electronics

My 1st generation Acoustic Energy AE1s were particularly prone to this effect. They sounded dreadful cold and liked being given a real bit of ‘welly’ to wake them up. The fact that their diaphragms were designed as voice coil heatsinks may have had something to do with this, slowing their warming to operating temperature.

Not surprising at all....voice coils are a ’motor’ in a fashion, a coil suspended in a magnetic field, made to move in a controlled fashion.  Just like an ordinary motor, driving a mechanism...

I’ve touched the backs of magnet structures and noted the temperature changes, sometimes to the point of ’ouch!’

That’s when I know it’s time to ’back off’ on the enthusiasm...;)

I leave my solid state amp on all the time so its warm and have always thought that its a good idea to let speakers warm up a bit, say 15 minutes before really laying into them but this was new to me.

Now come to think of it, these speakers Fritz has recently sent me, similar experience.  I had mentioned to him both times “these are starting to break in and open up” and his response Was that the drivers already had time on them, not sure about the crossovers but they probably had time on them as well.

Anyhow, very interesting.  
@schubert , I have never heard about cables adjusting to a speaker... thats an interesting and new thought as well.  Care to expand?  I have Analysis Plus Oval 8’s; absolutely love them.  May be my prized possession of my stereo 😁