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#1
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ambient temperature vs acoustics
I recently had the pleasure of working in a lovely wide hall with
limestone floor and walls and a glass roof. The job was basically to eq and compress material running on a 22 channel soundwall and I spent several days listening to material derived from classical recordings of english 'pastoral' works. What I think i noticed was a slight treble lift in there when the sun was shining bright and the room was warm ... Is this possible? or am I just being suckered by beautiful architecture and the 'aesthetic experience' ? I guess the rt60 was about 2s, and understand that this won't noticably change with temperature/pressure, but as stone warms up, could it's acoustic properties change enough for me to actually notice ? tia daz xxx |
#2
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ambient temperature vs acoustics
On Thu, 20 Sep 2007 14:49:19 GMT, "daz.diamond" wrote:
I recently had the pleasure of working in a lovely wide hall with limestone floor and walls and a glass roof. The job was basically to eq and compress material running on a 22 channel soundwall and I spent several days listening to material derived from classical recordings of english 'pastoral' works. What I think i noticed was a slight treble lift in there when the sun was shining bright and the room was warm ... Is this possible? or am I just being suckered by beautiful architecture and the 'aesthetic experience' ? I guess the rt60 was about 2s, and understand that this won't noticably change with temperature/pressure, but as stone warms up, could it's acoustic properties change enough for me to actually notice ? tia daz xxx The big change you will notice is with relative humidity. High frequencies are strongly attenuated by dry air. d -- Pearce Consulting http://www.pearce.uk.com |
#3
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ambient temperature vs acoustics
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#4
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ambient temperature vs acoustics
"Roy W. Rising" wrote in
message In my experience, the opposite is true. The Hollywood Palace Theater had some evaporative A/C. We'd rehearse all day without it, break for a meal while the audience loaded in (and the A/C was amp'd to handle more bodies) and return to tape the show. The room always was "deader", not because of the bodies but from the moisture of the A/C. The effect of adding more bodies is not to be ignored, particularly in a very live room. It may be that the warming of your venue noticeably changes the humidity. http://www.csgnetwork.com/atmossndabsorbcalc.html Is a calculator that lets you study the effects of both temperature and humidity as well as frequency and air pressure. |
#5
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ambient temperature vs acoustics
On 20 Sep 2007 15:43:07 GMT, Roy W. Rising
wrote: (Don Pearce) wrote: On Thu, 20 Sep 2007 14:49:19 GMT, "daz.diamond" wrote: I recently had the pleasure of working in a lovely wide hall with limestone floor and walls and a glass roof. The job was basically to eq and compress material running on a 22 channel soundwall and I spent several days listening to material derived from classical recordings of english 'pastoral' works. What I think i noticed was a slight treble lift in there when the sun was shining bright and the room was warm ... Is this possible? or am I just being suckered by beautiful architecture and the 'aesthetic experience' ? I guess the rt60 was about 2s, and understand that this won't noticably change with temperature/pressure, but as stone warms up, could it's acoustic properties change enough for me to actually notice ? tia daz xxx The big change you will notice is with relative humidity. High frequencies are strongly attenuated by dry air. d In my experience, the opposite is true. The Hollywood Palace Theater had some evaporative A/C. We'd rehearse all day without it, break for a meal while the audience loaded in (and the A/C was amp'd to handle more bodies) and return to tape the show. The room always was "deader", not because of the bodies but from the moisture of the A/C. It may be that the warming of your venue noticeably changes the humidity. Have a look here http://www.sfu.ca/sonic-studio/handb...opagation.html the graph in part 2 is informative. What is shows is that the attenuation of higher frequencies relative to lower frequencies increases as relative humidity drops, reaching a peak at about 10%RH. Below that it starts dropping again. d -- Pearce Consulting http://www.pearce.uk.com |
#7
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ambient temperature vs acoustics
"Arny Krueger" wrote:
"Roy W. Rising" wrote in message In my experience, the opposite is true. The Hollywood Palace Theater had some evaporative A/C. We'd rehearse all day without it, break for a meal while the audience loaded in (and the A/C was amp'd to handle more bodies) and return to tape the show. The room always was "deader", not because of the bodies but from the moisture of the A/C. The effect of adding more bodies is not to be ignored, particularly in a very live room. Of course. However, the theater was not unusually "live" and it's comfy seats were of the type designed for constant absorption wheather empty or occupied. It may be that the warming of your venue noticeably changes the humidity. http://www.csgnetwork.com/atmossndabsorbcalc.html Is a calculator that lets you study the effects of both temperature and humidity as well as frequency and air pressure. Useful! Thanks, Arny! -- ~ ~ Roy "If you notice the sound, it's wrong!" |
#8
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ambient temperature vs acoustics
The big change you will notice is with relative humidity. High
frequencies are strongly attenuated by dry air. let me try and understand : as the sun shines, temperature rises, the porous limestone releases some of its moisture to humidity as humidity rises, the air becomes more dense and then sound at higher frequencies propogate quicker/more efficiently, and there is therefore more of this content reaching my ears compared to changes due to the same effect, but at lower frequencies ? the building has a couple of humidity monitors (don't know the right term) - perhaps I'll go have a look daz xxx |
#9
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ambient temperature vs acoustics
On Sep 20, 8:43 am, "daz.diamond" wrote:
The big change you will notice is with relative humidity. High frequencies are strongly attenuated by dry air. the building has a couple of humidity monitors (don't know the right term) - perhaps I'll go have a look Hygrometer. bobs Bob Smith BS Studios we organize chaos http://www.bsstudios.com |
#10
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ambient temperature vs acoustics
The room always was "deader", not because of the bodies but from the moisture of the A/C. Dude... A/C removes moisture from the air. That is an effect of air conditioners that is intentional, and as important to increassed comfort as the reduction of temperature. I have a small unit in my bedroom that can remove about a pint of water from the 10'x15' room in a couple of hours on a hot humid day. I know because it collects the water in a pan. -- Posted via a free Usenet account from http://www.teranews.com |
#11
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ambient temperature vs acoustics
Hygrometer. (cough) thankyou |
#12
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ambient temperature vs acoustics
Tobiah wrote:
The room always was "deader", not because of the bodies but from the moisture of the A/C. Dude... A/C removes moisture from the air. That is an effect of air conditioners that is intentional, and as important to increassed comfort as the reduction of temperature. I have a small unit in my bedroom that can remove about a pint of water from the 10'x15' room in a couple of hours on a hot humid day. I know because it collects the water in a pan. 'Dude' ~ Perhaps you missed the part about the old Hollywood Palace Theater on Vine St. having "some" evaporative A/C ... good ol' swamp coolers! Ever heard of Ken Murray's Blackouts? In the '40s it was called The El Capitan Theater, not to be confused with the one on Hollywood Blvd. More history: http://en.wikipedia.org/wiki/Palace_...e%2C_Hollywood -- ~ ~ Roy "If you notice the sound, it's wrong!" |
#13
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ambient temperature vs acoustics
On Sep 20, 11:33 am, "daz.diamond" wrote:
Hygrometer. (cough) thankyou You're welcome. I'm getting mine along with the thermometer and barometer back from ISO 17025 calibrations in a day or so. bobs Bob Smith BS Studios we organize chaos http://www.bsstudios.com |
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