Does altitude change the sound of speakers??

The speed of sound is irrelevant if it’s the same everywhere in the room. Having “temperature gradients“ in the room would affect the sound, though - E.g., Chinese ice water bowls out in front of speakers.

cm, your ears did not plug up. As the pressure changes you have to equalize the pressure on the other side of the ear drum through your Eustachian tubes. Usually a good yawn will do it. Divers know all about it.
Only the speed of sound changes with altitude. Everything else stays relatively the same. In other words there is no difference from a sonic perspective. 

@marklevinson. Don't know, but that's one of the best moves I can think of. I'm envious. Be sure to explore all that beautiful area has to offer! 

marklevinson,

"I have some very loud cars and a very loud boat."

You'd better work on those quick. Before changes in the sound of music due to anything else become irrelevant.

I don’t know about altitude changing sound...but what about attitude?