Noise reduction of normal windows

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Wizard of Ozz wrote:

> Also, is loudness perceived as doubling every 10 db, or every 7 or 8
> db?


I always heard 3db.

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easytoremember123@email.com (Wizard of Ozz) wrote in message news:<fbcc7457.0408032249.30f0a505@posting.google.com>...
> I've seen some ads for sound-proof double-paned windows that claim to
> reduce exterior noise by 25-40 db, depending on the model. Anyone know
> how much a normal window reduces exterior noise in db?
>
> Also, is loudness perceived as doubling every 10 db, or every 7 or 8
> db?

I didn't find _exactly_ what you were asking about, but this is fairly
interesting reading:
http://irc.nrc-cnrc.gc.ca/cbd/cbd240e.html

also http://www.usg.com/Design_Solution [...] anning.asp

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"David Morgan (MAMS)" <mams@NOSPAm-a-m-s.com> wrote in message
newsU7Qc.20804$UN2.13260@nwrddc02.gnilink.net...
>
> 'Perceptually', I am pretty certain that it takes
> somewhere over 4dB to convince the ear of a doubling.


If you believe Everest or the author of my audio school text whose name
escapes me at the moment, the majority of humans perceive volume to have
doubled with an increase of 10 dB.

--
"It CAN'T be too loud... some of the red lights aren't even on yet!"
- Lorin David Schultz
in the control room
making even bad news sound good

(Remove spamblock to reply)

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"Wizard of Ozz" <easytoremember123@email.com> wrote in message
news:fbcc7457.0408032249.30f0a505@posting.google.com

> I've seen some ads for sound-proof double-paned windows that claim to
> reduce exterior noise by 25-40 db, depending on the model. Anyone know
> how much a normal window reduces exterior noise in db?

In the case of vinyl sash windows, for frequencies related to road noise,
all I can say is "lots". 20-30 dB loss in the midrange? Seems possible.

I have a friend whose house overlooks a major busy freeway that is
essentially right across the street, where his neighbor's houses *used* to
be. As long as he keeps the windows closed, you'd never know.

My own house's living/dining room is built like a big sun porch, with 4
banks of double pane vinyl sash windows 6 feet high and 6 to 12 feet long.
Opening and closing the vinyl windows makes a dramatic difference, to say
the least. Close em, and the sounds of the outside world go away.

This site purports to compare the two, but they don't say which kind of
double pane window. I used to have steel casement windows, and they weren't
nearly as effective.

http://soundproofwindows.com/comparison.html

These guys claim about 10 dB for a single layer of unsupported plastic:

http://www.westgeneral.com/acousti [...] cover.html

Here's some results in the 30 dB range for what looks like fairly ordinary
3-pane glass:

http://www.tailormadewindows.com/ask.htm

"We have been so impressed with the noise reduction that I have taken some
measurements with an ITN Sound Level Meter, model DSL120, S/N 120-93-126212.
Inside the living room the meter never goes above 40 Db(A) even when
transports go by. Outside the living room window the meter registers up to
60 Db(A) with car traffic and up to 70 Db(A) plus when transports pass."

> Also, is loudness perceived as doubling every 10 db, or every 7 or 8 db?

Common wisdom is a perceived doubling of loudness every 10 dB, all other
things being equal.

Now, about all those other things being equal... ;-)