Here's an interesting site that can provide a lot of insights with regard to venue acoustics and temperature/sonic speed: (http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html) Of course the lower humidity in the winter time will affect sound propagation as well. The expanse of Mylar that makes up the Maggie's main diaphragm, and narrower(but still long) Quasi-Ribbon driver would certainly be subject to expansion and contraction with changes in temp also. My Maggies are in a climate controlled environment, so I don't notice any seasonal difference in sound.
