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Need speakers that can rock with just one watt? You found da place.

RE: "resistive load that is the air."

Yes actually.
The term Rho C is in many calculations and is the density of air (about 1.21 kg per Cubic Meter) times the sound velocity.

Density or pressure does not change the speed of sound but density does change the acoustic load resistance as you suspected and it is reduced at altitude.

How much ambient pressure changes with altitude is interesting

https://www.omnicalculator.com/physics/air-pressure-at-altitude


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