palmyra,
As you must know, it's difficult to soundproof against low frequency
noise. There's a lot of low frequency noise on boats, and people must
sleep on boats. I found the cutting edge soundproofing material for
you. It's manufactured by Glacier Bay, Inc.
..."Glacier Bay is an internationally recognized leader in advanced
thermal control, sound reduction, and DC power management
technologies..."
Glacier Bay, Inc.
http://www.glacierbay.com/contact.asp
email: sales@glacierbay.com
phone: (510) 437-9100 (Oakland, CA)
Read about it here:
BARRIER Ultra-dB Flex & BARRIER Ultra-db Panel
http://www.glacierbay.com/insulation_ultradb.asp
And about soundproofing in general:
ACOUSTIC ATTENUATION
What about low-frequency noise? [bottom of page]
http://www.glacierbay.com/acoustic_attenuation.asp
..."Low frequencies are considerably harder to attenuate than higher
frequencies. They are also the most common type of noise found on
boats. Inch for inch you can't do better than BARRIER Ultra-dB Flex in
a flexible material. However, for maximum attenuation, particularly at
low frequencies, abandon the convenience of flexible products and back
the Ultra-dB Flex with BARRIER Ultra-db Panel. Incorporated into a
proper enclosure design, you just can't get any better..."
The future of soundproofing:
A Soundproof Idea to Block Noise
http://www.boeing.com/commercial/news/feature/stealth.html
If I can be of further assistance in regards to soundproofing against
low frequency noise, please don't hesitate to ask via the "Request For
Clarification" feature.
~~Cynthia
Search terms used at Google:
soundproof building material "low frequency" sound 50hz |
Clarification of Answer by
cynthia-ga
on
07 Jan 2005 06:35 PST
I forgot to include this link. I didn't want you to miss it.
Hear the results for yourself
http://www.glacierbay.com/insulation_ultradb_sound.asp
You need Flash, and good speakers to really appreciate this, but it is incredible.
Now imagine a good nite's rest...
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Request for Answer Clarification by
palmyra-ga
on
11 Jan 2005 04:45 PST
Cynthia,
I wasn't expecting to get a product reference for a proprietary
product - the web is full of those and none of them including the
Ultra Barrier db which you found make any claims for 50 Hz noise -
look at the attenuation comparison graphs at the bottom of the page
and focus on the 50Hz. Do you have any other ideas? I know that
there are 2 basic techniques (isolation and addition of mass) but I
want to be sure I get the best result first time.
Pat.
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Request for Answer Clarification by
palmyra-ga
on
11 Jan 2005 04:46 PST
Cynthia,
By the way they have so far failed to answer my email enquiry.
Pat.
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Clarification of Answer by
cynthia-ga
on
11 Jan 2005 07:19 PST
Bummer about the no reply... Ok, I'll find a more general answer. I
have a question locked right now and will get to this as soon as I'm
finished (and get some sleep).
I remember passing up sites that discussed soundproofing methods in a
general way, I can find them again.
~~Cynthia
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Clarification of Answer by
cynthia-ga
on
15 Jan 2005 14:07 PST
I have not found *exactly* what you are looking for yet. I'm sure
it's out there, and I will find it. I thought I would post what I
*have* found though, and let you know I have not forgotten about you.
This should be helpful, it discusses many options for different
applications in soundproofing:
TAKE A WALKING TOUR OF A SOUNDPROOF HOUSE!
http://www.soundproofing.org/infopages/sitemap.htm
Especially relevant is this link:
PORTABLE SOUND CONTROL ROOM!
http://www.soundproofing.org/infopages/portable_sound_control_room.htm
They sell a kit to make a soundproof room for music that could be modified:
Cost: 5 4'X10' blankets- $275 each (5 if you need a floor). Plus
shipping (50# each).
4 Corner framing mounts for 1" electrical conduit pipe (buy long
lengths locally): $40 plus $5 UPS
You might be able to use one of these blankets in your construction design.
And this page with a lot of building materials made for soundproofing:
http://www.soundproofing.org/sales/supersoundclip/supersoundclip.htm (scroll down)
Here's another site that discusses soundproofing IN a home, some of
the info is applicable:
Noise Basics - Sound Control 101
http://www.jm.com/insulation/building_insulation/2629.htm
Sound Control Options
http://www.jm.com/insulation/building_insulation/2780.htm
Creating Peace and Quiet
http://www.jm.com/insulation/building_insulation/2766.htm
..." You can reduce the travel of sound waves in your home in three basic ways-
* block the airborne pathways.
* break the vibration pathways, and
* absorb the sound energy.
=====================================
I'll post again. I have changed my search terms and strategy several
times, and will continue until I find comparisons on soundproofing
[material] against low frequency sound, or a viable option that would
allow you to get a good nights sleep..
~~Cynthia
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Clarification of Answer by
cynthia-ga
on
15 Jan 2005 15:08 PST
palmyra,
I found a study:
"Low Frequency Sound Absorbers" -- 11 pages
http://www.bbc.co.uk/rd/pubs/reports/1971-15.pdf (NOTE: you need Adobe - .PDF file)
Includes material comparisons and conclusions.
These search strings have a small number of relevant results:
Please see:
"absorbing low frequency sound"
://www.google.com/search?hl=en&lr=&q=%22absorbing+low+frequency+sound%22&btnG=Search
"low frequency sound absorbers"
://www.google.com/search?hl=en&q=%22low+frequency+sound+absorbers%22&btnG=Google+Search
Here's another option:
Noise Cancellation (scroll down to "Turn It Down!")
http://www.customallhear.com/resources/no70.htm
On the cutting edge of noise abatement is "active" control that, in
contrast to "passive" mufflers and barrier systems, fights noise with
noise. It is particularly effective against low-frequency tones. In
this technique, a sensor picks up sound pressure wave patterns and
feeds the data to a digital computer, which creates an "anti-noise"
pattern equal, but exactly opposite, to the targeted offensive noise,
thereby canceling it out.
The theory has been understood for years, but development of
high-speed computer chips capable of rapid, continuous, precise
calculations has made active control feasible......It can be "tuned"
to a specific piece of equipment, say a printing press. By
interfering only with the objectionable noise, the headset permits
speech and warning sounds to be heard. The firm claims users can
expect a 10 dB noise reduction in the 50 to 1000 Hz range..."
~~Cynthia
Additional search strings used at Google:
soundproof "low frequency" rating chart
soundproofing "low frequency" electrical transformer sleep
"low frequency sound absorbers"
"absorbing low frequency sound"
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