I believe they do, my system, when first turned on is definitely bass shy. It takes a couple of songs to get everything up to speed. I have been experimenting with turning the amp, source and pre on and letting them warm up,but the results are the same. I'm thinking it's the speakers. I also have noticed this with other components and speakers.
Do speakers take time to warm up?
For example, if my stereo is on and has been on for weeks, and then I connect speakers that have been sitting idle for a few weeks, do the speakers sound better after an hour of being played? Whats going on? Is it the caps in the crossover, the drivers, the ferrofluid in the tweeters? All of the above?