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Forum index » Science and Technology » Physics » Acoustics
Soundproof Box for Sleeping (to protect against noise from a bar)
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mflll@wiu.edu
science forum beginner


Joined: 02 Jul 2006
Posts: 1

PostPosted: Sun Jul 02, 2006 10:46 pm    Post subject: Soundproof Box for Sleeping (to protect against noise from a bar) Reply with quote

I wish to construct a sleeping area for myself to protect against
the bar which is on the other side of one wall (both in a one-story
building).
I measured 80 decibels (maximum) on my side of the wall. My sleep
physician
suggested I try for a 40 decibel reduction.

Using the Handbook of Noise and Vibration Control, Fourth Edition,
it looks like I need 3/4 inch plywood with about 10 millimeters of lead
to achieve this at 100 Hz. (I did not do a frequency analysis on the
sound but I can tell it often has a low-frequency component.)

Does this seem reasonable?

The real question is whether I need a six sided sleeping area or will
five door. That is, it will be completely open on the side opposite
the sound. My intention is to build something about one meter by one
meter
by two meters. How much sound would get around the enclosure and come
at me from the opposite direction? None of the books on noise control
I read discussed this.

Many have suggested covering the wall. However, that seems more
expensive
and less effective. I am only in the apartment to sleep and I don't
mind
sleeping in an enclosed area.

Dr. Laurence Leff Western Illinois University, Macomb IL 61455 ||(309)
298-1315
Stipes 447 Assoc. Prof. of Computer Sci. Pager: 309-367-0787 FAX:
309-298-2302
Secretary: eContracts Technical Committee OASIS Legal XML Member
Section
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Angelo Campanella
science forum Guru Wannabe


Joined: 08 May 2005
Posts: 226

PostPosted: Mon Jul 03, 2006 4:48 am    Post subject: Re: Soundproof Box for Sleeping (to protect against noise from a bar) Reply with quote

mflll@wiu.edu wrote:
Quote:
I wish to construct a sleeping area for myself to protect against
the bar which is on the other side of one wall (both in a one-story
building).
I measured 80 decibels (maximum) on my side of the wall. My sleep
physician
suggested I try for a 40 decibel reduction.

A good number, but really out of the realm of possibility.

Quote:
Using the Handbook of Noise and Vibration Control, Fourth Edition,
it looks like I need 3/4 inch plywood with about 10 millimeters of lead
to achieve this at 100 Hz.

Drywall' many layers of it, is the cheapest massive sound attenuator.

(I did not do a frequency analysis on the
Quote:
sound but I can tell it often has a low-frequency component.)

The usual problem with contemporary popular music.

Quote:
Does this seem reasonable?

no

Quote:
The real question is whether I need a six sided sleeping area or will
five door. That is, it will be completely open on the side opposite
the sound.

Hopeless. The sound level inside teh box will be essentially that
existing at the edge of the opening of your protecitve walls.

Quote:
My intention is to build something about one meter by one
meter
by two meters. How much sound would get around the enclosure and come
at me from the opposite direction? None of the books on noise control
I read discussed this.

As noted above.

Quote:
Many have suggested covering the wall. However, that seems more
expensive
and less effective. I am only in the apartment to sleep and I don't
mind
sleeping in an enclosed area.

Get another apartment.
That bar has spoiled that neighborhood.
The one you are in now was probably "at a good price", and now you know why.

Look for a quiet neighborhood.
In my single days, I roomed with private families.. the best deal of all.

Angelo Campanella
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Raoul Duke
science forum beginner


Joined: 03 Oct 2005
Posts: 10

PostPosted: Tue Jul 04, 2006 10:01 pm    Post subject: Re: Soundproof Box for Sleeping (to protect against noise from a bar) Reply with quote

mflll@wiu.edu wrote in news:1151880419.491048.150520
@m79g2000cwm.googlegroups.com:

Quote:
I wish to construct a sleeping area for myself to protect against
the bar which is on the other side of one wall (both in a one-story
building).
I measured 80 decibels (maximum) on my side of the wall. My sleep
physician
suggested I try for a 40 decibel reduction.

Using the Handbook of Noise and Vibration Control, Fourth Edition,
it looks like I need 3/4 inch plywood with about 10 millimeters of lead
to achieve this at 100 Hz. (I did not do a frequency analysis on the
sound but I can tell it often has a low-frequency component.)

Does this seem reasonable?

The real question is whether I need a six sided sleeping area or will
five door. That is, it will be completely open on the side opposite
the sound. My intention is to build something about one meter by one
meter
by two meters. How much sound would get around the enclosure and come
at me from the opposite direction? None of the books on noise control
I read discussed this.

Many have suggested covering the wall. However, that seems more
expensive
and less effective. I am only in the apartment to sleep and I don't
mind
sleeping in an enclosed area.

Dr. Laurence Leff Western Illinois University, Macomb IL 61455 ||(309)
298-1315
Stipes 447 Assoc. Prof. of Computer Sci. Pager: 309-367-0787 FAX:
309-298-2302
Secretary: eContracts Technical Committee OASIS Legal XML Member
Section


Try sleeping with you head in a gas oven!
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Tony177
science forum Guru Wannabe


Joined: 07 Sep 2005
Posts: 111

PostPosted: Wed Jul 05, 2006 9:58 am    Post subject: Re: Soundproof Box for Sleeping (to protect against noise from a bar) Reply with quote

"Angelo Campanella" <a.campanella@att.net> wrote in message
news:qk1qg.302781$Fs1.263158@bgtnsc05-news.ops.worldnet.att.net...
Quote:
mflll@wiu.edu wrote:

mflll@wiu.edu> wrote in message
news:1151880419.491048.150520@m79g2000cwm.googlegroups.com...
I measured 80 decibels (maximum) on my side of the wall. My sleep
physician
suggested I try for a 40 decibel reduction.

A good number, but really out of the realm of possibility.

I would add this general point to Angelo's comments:
It is no good taking a single figure of performance from a book and thinking
that you will get an improvement of that amount, by adding that material
into your existing setup. You are likely to be very disappointed.

Sound insulation is about controlling the vibration of solid materials and
air, in total systems of construction. You need to consider the whole
system: the external room, the internal box, and the air in both.

--
Tony W
My e-mail address has no hyphen
- but please don't use it, reply to the group.
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