NBPK402 Posted December 23, 2019 Share Posted December 23, 2019 I am at 7000', and I have noticed something strange...volume level required to reach a level you can hear voices at appears to vary by the time of day or weather. Has anyone else experienced this..if so how much does it affect the levels? Sent from my SM-T830 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Chris A Posted December 23, 2019 Share Posted December 23, 2019 The biggest effect of higher altitude on sound propagation is probably the humidity change. EDIT: dry air absorbs a lot more acoustical energy than wet air as a function of frequency. (Pressure has nothing to do with the speed of sound--only temperature and humidity are important.) So if you've got a huge swing in relative humidity during the day, you might be able to detect extremely small differences in the threshold power levels for voice intelligibility. From my own experiences with different 5.1 array center channel loudspeaker configurations (Heresy-->Reference Series-->Cornwall-->Belle-->JuBelle-->K-402-MEH and the clarity plots found within REW) and many hours of Audacity remastering (spectrograms of voice energy always contain a lot of high frequency content, which is where you find the differences in the sound of voices and in speech intelligibility), it is changes in relative high frequency SPL that most strongly affect our perception of speaking and singing voices. An article on the subject: http://www.rane.com/pdf/eespeed.pdf Chris 1 Quote Link to comment Share on other sites More sharing options...
Marvel Posted December 23, 2019 Share Posted December 23, 2019 I've been in certain recording studios where the temp was well controlled, but not the humidity. From one day to the next, the overall sound characteristics changed, sometimes enough that a lot of changing mic positions and setup was required if you were working on the same tracks as the day before. Some of the problems could have be air pressure changes. Bruce 2 Quote Link to comment Share on other sites More sharing options...
JohnA Posted December 23, 2019 Share Posted December 23, 2019 Temp, Altitude, and humidity all affect air density. Less dense air does not transfer energy as well. 1 Quote Link to comment Share on other sites More sharing options...
codewritinfool Posted December 23, 2019 Share Posted December 23, 2019 Brandi Wynne from the band Ozric Tentacles mentioned this in an interview. They were mixing an album in Ft. Collins. CO at the time, and she said that she’d listen to test mixes in the car, and it’d get too bassy on the way up and too trebly on the way down.Somewhere around the 2:15 mark: 2 Quote Link to comment Share on other sites More sharing options...
Khornukopia Posted December 23, 2019 Share Posted December 23, 2019 23 minutes ago, codewritinfool said: They were mixing an album in Ft. Collins. CO at the time, and she said that she’d listen to test mixes in the car, and it’d get too bassy on the way up and too trebly on the way down. They were higher than Ft. Collins. 😁 I live in a valley on a mountain and experience big elevation changes whenever I drive to or from home. The sudden air pressure differential between the inner ear and the atmosphere, when going up or down, or because of barometric changes due to the weather, affects the tension on your ear drums, influencing the tone of sounds. When the difference exceeds the eustachion tubes resistance and your ears "pop", sounds become clearer. 3 Quote Link to comment Share on other sites More sharing options...
glens Posted December 23, 2019 Share Posted December 23, 2019 I always found forcing a good deep yawn now and again while traveling in the mountains does wonders for that. Yeah, that artist's experience wasn't quite the same thing as brought up in the thread. Ft. Collins ain't even 6000 ft. is it? 2 Quote Link to comment Share on other sites More sharing options...
billybob Posted December 23, 2019 Share Posted December 23, 2019 Some use chewing gum... 1 Quote Link to comment Share on other sites More sharing options...
Marvel Posted December 23, 2019 Share Posted December 23, 2019 2 hours ago, glens said: Ft. Collins ain't even 6000 ft. is it? Approx. 5000 ft. My SIL is in Colorado Springs at 6000, but even the the area varies a bit. 1 Quote Link to comment Share on other sites More sharing options...
NBPK402 Posted December 23, 2019 Author Share Posted December 23, 2019 I bring this up, because sometimes I need to raise the volume from -30 up to -20 or even higher to hear the voices. It doesn't make a difference which sources player or movie either. Only time of day, and weather. At first I thought it was me, but our relatives are in town, and they are 20 years younger than I am and they also complained. I also keep reading reviews in my RP160Ms about them being a bit bright, and I find if anything they are not bright at all. The article below makes sense to me now as to high frequencies needing more power at altitude too.This is not regarding moving from low altitude to high, but staying at a high altitude. I found an article that reiterates my problem here... https://www.stereophile.com/asweseeit/590awsi/index.html https://forums.stevehoffman.tv/threads/does-altitude-affect-how-you-hear-a-system.113732/ According to a post in the 2nd link all the big bands adjust the EQ depending on the temps. Sent from my SM-T830 using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
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