Hello, I hope this question has not been asked: is the performance of the M-series speakers, with their metal drivers, affected by room temperature?

I live in Canada and have my stereo (Cambridge Audio A500+D500SE+M3's) in on the top floor, which is not as well-heated as the rest of the house (moving the set-up is not an option). The sound in the spring and summer is more open and comfortable than in the winter. Any ideas?

Thanks,
CDG