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In Reply to: RE: "resistive load that is the air." posted by Ivan303 on June 14, 2023 at 06:04:11
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
Follow Ups:
I think this would apply Underwater as well.
Yes, the same terms come into play too, Rho / density per cu/mtr and C the speed of sound.
The impedance per area are HUGELY different, a PZT ceramic itself is a pretty good impedance match to water's radiation resistance but is close to useless as a direct radiator in air.
In the levitation sources i made a stack of 4 PZT elements and that drove a resonant titanium transformer and flexural radiator that had a Q of around 300-500 and that made an efficient source. One could levitate a styrofoam ball at 10Watts input about 160dB @ 22KHz.
Tom
sounds like loads of fun outside of music
About 1dB less at 6000 feet.
Does that mean my EdgarHorns are only 105dB speakers at 7000 ft?
Dang!
"Reality cannot exist because it cannot keep up with the lies on the Internet."
Probably. Go high enough and they'll be 0dB.
mean speaker are more or less efficient here?
Do they have to work harder to move the same mass of air as they would at sea level?
Gotta be SOME audio benefit from living where there are so few molecules of oxygen in the air.
"Reality cannot exist because it cannot keep up with the lies on the Internet."
Air density determines the impedance load presented by the air. The higher impedance of denser air creates a more efficient energy transfer. It's the same thing that makes horns work. The higher air load impedance of a throat area smaller than the cone along with the mass of the air column creates a more efficient energy transfer than directly coupling the cone to the air.
Edits: 06/16/23
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