Speed of sound
Hi
Not only affected by density (altitude) but also temperature and humidity. You may find some useful stuff here:
http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html
Cheers
Rob
Hi
Not only affected by density (altitude) but also temperature and humidity. You may find some useful stuff here:
http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html
Cheers
Rob
Bob,
Don't even worry about it. With OB, the room and floor boundaries play a much more significant role that calculations, spreadsheets, etc. can be thrown out the window. I build only OB speakers and live at 1500m. The only calculation I ever use it to compute an estimated Fequal point and in room you always get more bass than that. That's the beauty of OB, no formulae etc to restrict you or tell you what to do.
Don't even worry about it. With OB, the room and floor boundaries play a much more significant role that calculations, spreadsheets, etc. can be thrown out the window. I build only OB speakers and live at 1500m. The only calculation I ever use it to compute an estimated Fequal point and in room you always get more bass than that. That's the beauty of OB, no formulae etc to restrict you or tell you what to do.
What is left out of what has been discussed so far is humidity. Humidity can have an effect on sound velocity as well as temperature and pressure.
Download Claus Futtrup's DPC calculator. He has a few text files included in the package which detail how to calculate sound speed for varying pressure and temperature and humidity.
Download Claus Futtrup's DPC calculator. He has a few text files included in the package which detail how to calculate sound speed for varying pressure and temperature and humidity.
It is not a lot, as a first approximation it is easily neglectable compared to temperature. The effect is there, and it gets greater with increased temperature.
T in celcius
RH in percent (relative humidity or w/ws)
c=speed of sound in m/s
I have a tool to calculate:
T=0, Rh=0 - c=331.4
T=0, Rh=100 - c=330.8
so ~0.3% difference
T=40, RH=0 - c=354.8
T=40, RH=100 - c=347.9
so ~2% difference
T in celcius
RH in percent (relative humidity or w/ws)
c=speed of sound in m/s
I have a tool to calculate:
T=0, Rh=0 - c=331.4
T=0, Rh=100 - c=330.8
so ~0.3% difference
T=40, RH=0 - c=354.8
T=40, RH=100 - c=347.9
so ~2% difference
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