Ability to Hear Through the Walls

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how to hear through walls

wondering about that muffled

conversation on the other side of your

wall do you wonder weapons being said

whether it was on a stranger or loved

one or in your own home or elsewhere it

ms probably not a good idea to spy

however if you decide to go ahead and

eavesdrop there are several ways to

listen through walls with a surprising

amount of clarity just be sure that you

know the law and criminal risks if you

decide to act

method 1 using a glass

one get a glass

so Envy decided to go for it how do you

get started spying one method is a

simple glass held against the wall the

reason this works is that you create an

acoustic coupling between the wall and

the glass allowing sound waves to travel

from one side to the

other a soda or beer glass works best

some eavesdroppers also swear by Dixie

Cups but glass seems to conduct sounds

better than other kinds experiment with

different types and shapes of glasses to

see which one works best for your


if you have an iphone you can download

the amplitude Pro app and hold the

iPhone to the glass against the wall

this app allows you to hear a distance

sounds much more clearly but it also

records and saves the amplified noise

to scout for the clearest spots

some places on a wall will

natsound more clearly than others for

reasons of structure or distance from

the source of the sound experiment to

test the sound quality until you find

the best place sometimes this can be

difficult if the sound is coming

from the ceiling if you're too far away

from the sound on the wall

you won't hear things very clearly

three place the rim of the glass against

the wall

remember in order for it to work you

have to couple the wall and glass

acoustically do this by placing the

glass flat rim down against the wall now

sound waves will go from the wall into

the glass and make it easier for you to

detect them

once the glass is in place put your ear

to the bottom of the glass continue to

move the glass on the wall if you can't

hear well

method 2 using a hole

one drill a tiny hole

another way to hear through a wall is

with a hole and plastic membrane a

method recently discovered by scientists

in Japan and South Korea first drill a

very small hole all the way through the

wall a power drill with a small long bit

will work best to do this

'don't expect to hear too much through

the hole alone in fact a plain hole in a

wall seriously hinders sound

transmission try to pick a time when

your neighbor is out to drill through

the wall otherwise they may well notice

the sound or debris from the


to cover the hole with a thin membrane

this is what should make the method work

really well you see studies show that

when you cover the hole with a thin

membrane on one side the transmission

becomes almost as if there is no wall

because the membrane equalizes the

pressure on both sides of the hole and


sound through try using a common

household item namely plastic wrap in

fact the scientists who conducted the

initial study used plastic wrap


three listen away

once you have your whole and plastic

wrap in place

listen away if executed properly you

should be able to hear what is happening

in the opposite room quite clearly for

even better results try this method in

conjunction with the first put a glass

over the top of

the whole and plastic membrane be aware

that drilling a hole in the wall has

very clear disadvantages especially as

regards secrecy your neighbor might hear

the drilling she might see the hole or

she might notice the drill debris on the

floor and become

suspicious use with care

method 3 using a spy stethoscope

one collect your materials

wet marine now getting into more

sophisticated listening equipment you

can either make a listening stethoscope

on your own or buy one pre-made models

will save you time but can cost several

hundred dollars unlike a pre-made model

however making your own stethoscope

probably cost around or under $25

provided that you already have a fairly

good mp3 player you can typically find a

stethoscope at your local drug store for

about ten dollars the quality of the

stethoscope is unlikely to make much of

a difference

you will also need microphones stereo

Multimedia microphones are preferable as

they are cheap around $15 but have

fairly good sound specifications that is

you should be able to pick up sound with

them pretty easily and with fair quality

finally you will need to have an mp3

player to record sound as well as a

three five millimeters mini stereo Y

adapter cable the cable will be quite

cheap about $3 or $4 dollars the mp3

player will be the most expensive item

if you do not already own one keep in

mind that it must

be able to record which probably means

that you will need a newer model many

older ones do not record but only play


to disassemble the microphones

you will need to cut down the middle of

the microphones in order to get to the

wiring remove the tops or headers and

release the microphones you will then

insert the exposed microphones into the

stethoscope earpieces a good tool for

doing this is an

exacto knife it will make a clean cut

through the outer parts of the

microphone and let you get to the

innards you should be left with to mix

and three five millimeters connectors

the cabling

three disassemble and reassemble the

stethoscope earpieces

remove the ear pieces from the

stethoscope this is fairly easy and they

should just pop right off don't get rid

of them however as you'll need to attach

them to the microphones next gently

drill shallow holes into each of the

plastic ear pieces

to a diameter that matches that of the

microphone housings the size of these

holes needs to be exact as the

microphones must fit squarely inside of

them a power drill or grinder can give

you the desired precision glue the

microphones inside the

earpieces put a dab of glue around the

edges of the microphone housings and

then insert them into the holes that you

have just drilled in the stethoscope

earpieces reattach the earpieces back to

the stethoscope and let the glue dry

for hook the stethoscope to mp3 player

last attach the stethoscope and

microphones to the mp3 player use the Y

adapter cable to connect the microphones

to the mp3 player the sound that you

pick up through the wall will now be

collected and amplified by the

microphones transmitted to the mp3

player and

recorded or saved plug the single stereo

connector into an mp3 player your spy

stethoscope should be ready to go now

five start listening

practice first with your Stathis cope as

with an ordinary glass you may have to

experiment a bit to find a good

placement on the wall or to get the hang

of recording however unless the walls

are double glazed or have thick

insulation you should be able to

here what is being said on the opposite


method for knowing the consequences of


one ask yourself

do you really want or need

by listening through a wall you are

about to spy on another person and

violate private conversations this

raises big legal and ethical problems

before acting seriously ask yourself if

you want to do it is it worth the risk

the situation is important in England

for instance a man rescued his elderly

neighbor from a robbery by listening

through the wall with a glass in his

situation spying was definitely

justified things are rarely so clear-cut

however you should probably not act

if you have any doubts about the

situation if you decide to go ahead make

sure that you know the possible

consequences of your actions

to be aware of eavesdropping laws

eavesdropping means to overhear record

magnify or transmit any part of a

private conversation without the consent

of at least one person involved

be aware that states have laws against

eavesdropping by spying you may well be

breaking the law you might

even be violating the law by possessing

a device for spying your state may have

a one-party consent or two-party consent

law one-party consent means that it is

illegal to eavesdrop unless you have the

consent of at least one of the people

engaged in a private

into party consent you must have

permission from both parties to listen

record or amplify their communication

take the state of Michigan Michigan has

a two-party consent law you must have

permission from all parties in order to


record amplify or transmit any part of a

private discourse this applies even in

your own home eavesdropping there is

also a felony

three consider all negative consequences

what happens if you eavesdrop and

someone finds out what could happen to

you this is a good question and you

should consider all of the possible

outcomes which in many cases are severe

in Michigan the penalties for illegal

eavesdropping are up to two

years in prison up to $2 oh-oh-oh in

fines or both in California

eavesdropping is either a misdemeanor or

felony as a misdemeanor you face up to

364 days in jail and a $2 500 fine as a

felony you could spend up to 3 years in

prison and a $2 500 fine

of course a criminal penalty is not the

only bad outcome you also open yourself

to a civil lawsuit for violating Samia

Newton's privacy which could be costly

and run into the thousands of dollars

even if you escape legal consequences

you could have a very angry person on



things you'll need for the glass method

a glass a wall an iPhone with the

amplitude Pro app optional for the spy

stethoscope a stethoscope stereo

multimedia microphones 3 5 millimeters

mini stereo Y adapter cable

exacto knife or similar small drill glue