A better place to ask this type of question is in the group
sci.electronics.repair and sci.electronics.misc
This is off the subject of this news group, but you may find it interesting.
If you don't like it, or want to miss the following, just move on...
To start with, sound is pushing air back and forth at a high velocity (speed
of sound) The velocity and inertia of the sound is depended also on the room
temperature, humidity, and barometric pressure. Larger speakers and more
power will be able to push a greater amount of air, thus penetrate better.
If the room temperature is cooler, the sound will also penetrate more.
These effects under normal living conditions are only measurable with the
proper instruments.
Your resolve would be to have the walls, floor, and ceiling acoustically
insulated. There are various specialized materials for this. In large
apartment complexes that are considered sound proof (most are only partially
sound proof), they use insulation in the walls that have some acoustic
insulation specifications combined with the RH factor insulation quality. In
the standard duplex, or lower cost buildings, the people who are building
them are only interested in having the least cost, therefore do not pay
attention to sound proofing.
Simple physics of sound is when there are sound waves striking an object,
the object will conduct these waves if there is nothing to block them from
striking. The characteristics of the object such as the size, surface areas,
mass, and natural resonance will effect how it will react. The larger the
surface area, the more sound waves can hit it, therefore there is more force
over its surface area. All objects will also react differently due to their
natural resonance.
You can stop some of the radiated vibration of your speaker boxes by not
wall mounting them. Wall mounting gives a direct coupling to the wall. In
your case you want the opposite. The farther away they are from any wall,
floor, or ceiling, the less effect they will have on the surfaces. Mounting
them on something like sponge, or a poor acoustic coupling material will
lessen the direct acoustic conductivity to the surface that they are resting
on. The energy effect of the sound drops off with distance. It follows the
inverse square law factor. This is where Db measurements come in. This can
be translated to acoustic force.
Infact, sound waves can be so powerful they can be made in to a weapon, if
the proper frequency and power levels are applied. The necessary acoustic
equipment is required as well. I have seen large systems in homes actually
do structural damage to the building, because the user decided to play their
favourite music very loud.
It is said that Enrico Caruso, and Italian opera singer Beniamino Gigli in
the 1940's that managed to break a wine glass with their voice! I have only
seen this done with specialized audio equipment. Also Ella Fitzgerald has
demonstrated this. Infact she did this in a Memorex commercial.
I hope that this little explanation gives you an idea of why it is difficult
to accomplish what you want to do. You will need tolerant neighbours. You
can check the local by-laws for your area. In the area where I live, we can
make up to a certain amount of Db's of noise between the hours of 10:00 to
21:00. After 21:00 if there is more than 3 complaints, an expensive fine
can be sent to the abuser. After 2 fines, a court order will be issued to a
bailiff to seize the audio equipment. I live in a large condo complex, and
have seen this happen to a few people in the area. So, there is not very
much noise around here. This is why I moved here.
--
Greetings,
Jerry Greenberg GLG Technologies GLG
=========================================
WebPage
http://www.zoom-one.com
Electronics
http://www.zoom-one.com/electron.htm
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"Dodgy Dave" <> wrote in message
news:bndgvl$rhp3s$...
I've just moved into a new flat & obviously don't want to upset my new
neighbours with loud music. Someone lives up and down from my flat. My
question is - does sound waves travel up or down or outwards? I don't play
music loud, but feel that i'm entitled to play music at a reasonable level
in my own home whilst not overdoing the volume. Don't want to **** the
neighbours off tho so would appreciate any advice. I did have my speakers on
the window ledge, but have invested in some wall mounted speaker brackets -
would this reduce the sound travelling up and down the building. Any ideas?
Thanx.
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