Does altitude change the sound of speakers??

The OP obtained excellent guidance from me, and with humor. 
-New room, all comparisons are relative
-Change IC's, bigger difference 


Now how about a reality check? 
Attendees of RMAF all know how horrid the rooms sounded due to the elevation. The bitching was constant, the frustration endless. Well, actually, not. Actually, no one discusses elevation and effects on speakers, because it is a non-issue. Anyone wants to waste their life on things like burn in and elevation, feel free. :(

No, actually, like Vegas, all the rooms sound awful because of the shared AC power and seismic vibrations. Come on, guys! Besides too many 200 lb resonators of the human Variety in the room. 😬

Heh Chorus, I met Mark L. at a Boston audio store years ago.

I moved from 800' to 7220' about a dozen years ago, and do not recall any significant change in speaker sound due to altitude. The ability to listen at volume levels that do a system justice was an improvement very much more readily noticeable.

I do have a premium system in my truck and I experience substantial altitude changes in my travels. What I notice is that my ears plug up and things overall don't sound right. After I clear them, everything sounds much better. Meaning that there are other factors involved and I can't discern any change in the sound of the speakers directly due to attribute.

Humidity also a factor.