Google: "speed of sound at sea level vs altitude".
While the speed of sound varies with altitude the reference is to a standard temperature.
Humid air is also less dense therefore lower in pressure and changes
the speed factor accordingly.
For a Pilot operating an Aircraft at 30,000 feet Pressure Altitude becomes a life and death matter but a 5,000 foot difference in a listening room will not change the factor enough to make much difference.
However Caribou Ranch Recordings seem to have some notoriety amongst recording artists.
While the speed of sound varies with altitude the reference is to a standard temperature.
Humid air is also less dense therefore lower in pressure and changes
the speed factor accordingly.
For a Pilot operating an Aircraft at 30,000 feet Pressure Altitude becomes a life and death matter but a 5,000 foot difference in a listening room will not change the factor enough to make much difference.
However Caribou Ranch Recordings seem to have some notoriety amongst recording artists.