Noisy Neighbors

Stressful noise from neighbors




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Introduction

Talking to the neighbor

Fallacious arguments

Legal rights

Legal path

Studies

Questions and answers



Audio and video

Wireless headphones

Noisette

Relaxation sounds


Introduction

Unwanted music, especially in the very low (/ bass) frequencies, is stressful because its beats disrupt the rhythms of the brain and heart (because the music beats have a periodicity similar to the heart beat), of the activity that people are focused on (including relaxing). Music has about one beat at every second, which means that during a few hours of listening there are many thousands of them. By its very design, a (very low frequency) beat is a very rapid compression of air which is meant to whip the air, and when it hits a wall, the wall starts to pulsate in the rhythm of the music beats, causing shockwaves on the other side of the wall, shockwaves that feel like hits on the brain. When exposed to such unwanted music, people can't think normally.

Normally, sound only affects the eardrum and is therefore heard by people. If the sound's power is high enough, it can also affect the rest of the body and will be felt. Very low frequency sounds, like those from music bass, even at a low perceived volume, both affect the eardrum and are felt (like hits) by the entire body.

Tiny science lesson: A wave (electromagnetic, sound or tsunami) is a disturbance that carries energy without transporting matter, and disturbs the matter it interacts with. Waves can cause resonance inside the objects they interact with, and this amplifies the power of the waves. Mechanical waves, like sound, travel only through matter (including gases like air), disturbing it but not carrying it with them. While there is no sound particle, you can still hear sound and it can still rip your eardrum or even clothes apart, given enough power. The smaller the frequency of a wave is, the larger its wave length is, and the less it is dampened by obstacles; this is true for both sound and electromagnetic waves.

Very low frequency sounds are not absorbed by walls, they make the walls vibrate perceptibly and go further right through them with virtually no attenuation. Medium and high frequency sounds are easily absorbed by objects (like walls), so they don't normally go further (unless they have enough power). Also, the bass has a much higher power than the satellite speakers because people are less sensitive to very low frequencies (so more power is required to be heard). Moreover, the music beats generated by a subwoofer are produced with the peak power of the subwoofer; as an example, the average room-filling satellite speakers pair has a maximum RMS of 40 W, while a subwoofer's peak power is 500...1'000 W. However, objects (like walls) don't have sensitivity, so they are affected by the entire power of the sound.

Music bass (produced by a subwoofer) is a pulsating very low frequency sound. It's a repetition of beats that form shock waves which feel like a hammer hitting the body at every second. The very low frequency sound has the capacity to make heavy objects (like walls), not just air, vibrate perceptibly, while its pulsating pattern has the capacity to make objects pulsate with the beats of the music. In the same way, bass makes the internal organs pulsate, starting with the most delicate part, the brain, causing distress of an intensity that depends on the volume and duration of the bass. People can't think normally at such times.

Unwanted music beats, especially in the very low (/ bass) frequencies, have an effect similar to the Chinese water torture, where the beat is the water drop and the need to stay in the home (to sleep, rest or perform various activities) is the restraints.

The long-term physiological effects of bass include lack of energy and of will to do things, high blood pressure, heart fluttering (which feels like a butterfly's touch), stomach and esophagus burning sensations, low libido.

A radio set can't normally generate low frequencies, which is why it sounds tiny / thin. It's unlikely for a radio set to be heard by neighbors, unless its volume is very high or the walls are very thin. But the more power the speakers can give to low and very low frequencies (that music beats are made of), the more stressful the percussions of the beats get.

Other, less visible, sources of pulsating, very low frequency sound are: large urban and industrial areas, car engines (and music listened in cars with subwoofers), vibrating mechanical devices (like pumps and ventilators). See this for more details.

See Studies for the effects of sound.



Bass details

Why is bass felt whereas "normal" sound heard?

Bass beats are shockwaves with a period of about 1 second, which pass through the walls, forming wall-sized waves that hit the people on the other side, and are felt (not just heard) as percussions / impacts / shock waves, just like a firing cannon is felt. Beats literally feel like someone is hitting you every second. It feels like being inside the subwoofer.

The very low frequencies of the bass are not absorbed by walls, they are actually amplified by walls through resonance. The walls and the body resonate at very low frequencies (those from bass), and this amplifies the power of the waves.

High frequencies are absorbed by walls much easier, so they are absorbed before they reach the other side. For example, for each doubling of the frequency, a brick wall provides more sound insulation with about 5 dB; for each halving of the frequency, the wall provides less sound insulation with about 5 dB.

The human ear is much less sensitive to low frequencies than to high frequencies, so a subwoofer's volume (= output power) is increased much more than the volume of the satellite speakers. Moreover, the music beats generated by a subwoofer are produced with the peak power of the subwoofer; as an example, the average room-filling satellite speaker has an RMS of 20 W, while a subwoofer's peak power is 500...1'000 W. However, objects (like walls) don't have sensitivity, so they are affected by the entire power of the sound. This means that the air pressure created by a subwoofer (which generates the audible low frequencies of bass) is much higher than that created by the satellite speakers (which generate the audible high frequencies). Satellite speakers can also produce very low frequencies, in particular those that have a bass knob.

When you feel the music / bass, so you don't simply hear it, the inside of the body (starting with the most sensitive part, the brain) is literally compressed by the music beats. When these beats are unwanted and they happen for hours, it's torture. If a very low frequency sound is not pulsating (= has no beats), it's perceived as a pressure wave (= hum) instead of a beat.

Feeling the bass is an indication that every beat makes the internal organs pulsate, not just the eardrums.

Sound patterns make sound perception very different. The difference between sound in general and bass beats, which is a pulsating very low frequency sound, is like the difference between speech (which is called airborne noise) and hitting a wall (with a hammer, or even a hand; which is called impact noise). In short, the difference is that an impact noise is a shockwave during which the noise is produced in a very short timeframe; the fast alternation between silence-noise-silence can be stressful to people. Bass is a shockwave which hits walls / bodies like a hammer, at every second / beat, making them pulsate with the beats of the music. It is virtually unstopped by walls. It has the same effect on the internal organs, starting with the most sensitive part, the brain.



Talking to the neighbor

When trying to find out from where sound is coming, especially in the form of low volume pulsations without a clear cause, be aware that simply listening from inside of your home is pointless. Sound, especially bass, can appear to come from one place but actually comes from the opposite direction. To find out the source, you have to listen to doors because they have the lowest sound insulation.

If you ever feel the need to ask a neighbor to turn the music down, instead of this, depending on your situation, you should tell the neighbor any of the following:

  • Please don't use a subwoofer because the bass makes the walls (and my head) pulsate. This is very stressful because it feels like being inside a subwoofer; every bass beat feels like a hit and this repeats every second, thousands of times per hour. It's not enough to reduce the volume of the subwoofer because if it has power, it will make the walls pulsate even at the lowest volume. Also, please keep the music volume at the level of a normal conversation.

  • Please listen to music using (wireless) headphones. There are wireless headphones (either WiFi or Bluetooth) whose sound clarity is much better than that of most (standalone) speakers. It's true that you will only hear the bass in your ears, not feel it in your body, but they also don't stress your neighbors. Here is a small tutorial.

Don't ask the neighbor to turn down the music. If you do, you'll likely still hear it and you will have to ask again and again until you can't hear anymore.

If the neighbor only turns the volume down, you can try again by saying:

  • Unfortunately, if the subwoofer is working, even if the volume is lower than before, the walls still pulsate because the bass is not absorbed by walls. Please don't use the subwoofer at all.

Most subwoofers which come with satellite speakers can't be turned off independently from the satellites. Even if the subwoofer's volume is turned to the minimum, you would still feel the bass. Some satellite speakers, from audio systems that come without a subwoofer, can also can generate bass, although its frequency is not as low as a subwoofer's.

If the neighbor has a habit of slamming doors, try this:

  • Please don't slam the door, press the handle when you close it. If it's slammed, it's very noisy and feels like a shock (wave), like a hammer is hitting the wall, and this can happen at any time (of day). It also wears its sealing gasket much faster, which results in degraded insulation performance.

If you argue with the noisy neighbor, he will continue making noise. Don't tell a noisy neighbor that you know the law; some people feel threatened by the law.

Instead of talking to the noisy neighbor, you could print (one of) the above bullets and, if you live in an apartment building, you could try to display it where everyone can see it (you need the approval of the home owner association), or you could put a printed copy in the mailbox of each (nearby) neighbor.



Fallacious arguments

During your conversations, some neighbors might start defending themselves with fallacious arguments.

People use fallacious arguments in order to pretend that they are the victim of that situation.

Fallacious arguments appear related to the argued subject, but in reality lack a rational connection.

Fallacious arguments are psychological manipulation tools which are used as attempts to block the listeners from responding, in the belief that the listeners would then stop their actions.

The result of fallacious arguments is blocking rational communication and understanding of the situation.

Below are possible answers to some fallacious arguments.



I can do what I want on my property.

Not if you're hurting other people.



I can't even flush the toilet because it disturbs you.

Flushing the toilet takes a few seconds of low volume noise that has no beats or bass. Music has beats which feel like a hammer for hours, with a beat at every second.



I can't make any noise because of you.

I am complaining about impact noises which can be avoided, noises which feel like a hammer is hitting me. Everyday household noises are rare, random and can't be avoided, so I'm not complaining about them.

For example, the beats from loud music, especially the bass (generated by a subwoofer), make the walls pulsate and feel like a hammer is hitting me every second, for hours.



This way you can say that any sound bothers you.

Most sounds (in a home) don't have a beat every second, and don't make the walls pulsate for hours. Also, you can avoid using a subwoofer, you can keep the music volume at the level of a normal conversation, and you can use (wireless) headphones, but other sounds (like cleaning or renovating) can't be avoided.



Why don't you complain when people renovate their home and bang with the hammer all day long?

Because there is a construction law which makes it explicitly legal to build and renovate a home. Also, the noise made during construction / renovation can't be avoided, and people do these things only once every few decades.



Why don't you complain to other people about their noise?

I did but you didn't see me doing it.



I am stressed and I need to relax.

Everybody has problems, everybody is stressed, but most people don't hurt others.



I listen to music only once a year.

If everyone around would do the same, we would listen to unwanted music every week / day. Please do not use a subwoofer and keep the music volume at the level of a normal conversation, or use (wireless) headphones.



I will turn the music down.

If the subwoofer has power, it will make the walls pulsate even at the lowest volume because the very low frequencies of the bass are not absorbed by walls, they are actually amplified by walls through resonance. Please do not use a subwoofer and keep the music volume at the level of a normal conversation, or use (wireless) headphones.



You have a problem. You are old.

Okay, I have a problem. That doesn't give you the right to make me suffer.



Let's be good neighbors.

Sure. When someone tells you that you're doing an action which is directly hurting them, you should stop doing it (regardless of what the law says).



Is that a threat?

Using the law is not a threat, it's a way to help you understand that you are hurting others and you should stop. Doing illegal things would be a threat.



This is life in an apartment building.

Life is made by the choices of people. Since this noise can be avoided, you can choose to make life quieter or noisier.



Why don't other people complain about the noise?

Because they have no idea what is going on, how to identify the source of the sound, or how to better explain to you to stop the noise.

If you don't stop now when you get a clear explanation of why the noise is hurting others, what possibility is there for other people to get through to you with no arguments?



Why are some people so sensitive to music?

If you mean to say that you are not sensitive to music, but others are, try listening to music from another room, listening to the wall pulsate, for a few hours, while trying to focus on some other activity.

That's happening to the people from the other side of the walls. When you listen to music in the same room as the speakers, you don't hear the walls pulsate because the speakers overpower them.



Studies show that music has beneficial health effects.

Those studies are performed on people who are willing to listen to (specific types of) music, and listen in the same room as the speakers, not through a wall that's pulsating. I want to listen to music when I feel the need, but now I'm forced to listen to the pulsating walls, and this feels like a hammer is hitting me every second, for hours.



Only children's brains develop (and need quiet).

First of all, this statement is false with regards to brain development. Brains grow and lose neural connections throughout their lives, in both children and adults. That's how learning is done, that's how reinforcement (through repetition) is done, that's how memory works (children don't remember their first few years at all). The rate with which growing and losing happen may differ for children and adults, but it's a different rate, not a binary switch.

Secondly, even if the brain development rate in the adult brain were 0, what is this suppose to imply? That adults don't suffer, don't need to be happy, don't need to rest, that they can focus on a task under any adverse conditions, that they must bear any adversity coming from someone who doesn't care about the people around, that they are only allowed to survive rather than live a happy life? As a logical statement it means none of these things, but that's the insinuation.



Legal rights

Is there a right to have quiet? What about a right to listen to music?

Most likely you'll not find any law around the world that explicitly gives people the right to either have quiet or listen to music (specifically, to disturb other people's quiet with music). In the absence of something explicit, how is a right established?

Generally, people believe that they have a right to anything they like to do (and is not expressly illegal). In legal language there is a subtlety which escapes colloquial language. When an action is not expressly forbidden it means that it's not expressly illegal, so it's possible, but it's not expressly legal either. This means that listening to music isn't necessarily a right.

A right may be expressly given by a law. For example, construction law gives the right (perhaps based on a permit) to build and renovate, while a permit which is issued by the city hall can give the right to hold a public music concert.

(Even someone who has a permit to make noise on a regular basis may be fined, or have the permit revoked, especially if the noise breaks environmental laws.)

It's possible to argue that the right to listen to music exists because of the Universal Declaration of Human Rights (UDHR). Specifically, article 24 states "Everyone has the right to rest and leisure". The word "rest" could mean "quiet", while "leisure" could mean "listen to music". The critical distinction between these potentially conflicting rights is that the effects of Alice exercising her right to listen to music enter Bob's property and actively obstruct his right to have quiet, and may actively degrade his health (see Studies).

In a legal system where Alice's rights must respect Bob's rights (article 29.2 from UDHR), this means that Alice is legally responsible for the direct degradation of Bob's health. To make a parallel, some people may consider beating other people to be leisure (and therefore a right), but because this action directly degrades the health of the beaten, it must be (and is) illegal.

A right may also arise from custom. However, just because people perform a certain action doesn't mean that the action is a right, especially when only few people perform the action. For example, just because some people are used to spit on the streets, doesn't means that it's a right, it's not illegal (in some places it is), but it's not a right; basically, it's not a custom to spit. Few people make so much noise that it disturbs their neighbors, so, in fact, the custom is to not have a noisy environment and to not listen to loud music.

When does sound / music become a disturbance? What should the law say (but usually doesn't)? Disturbing sound is sound that's produced by an activity that can be avoided or can be performed so that it doesn't produce sound, with reasonable financial costs for most people, when any component of the sound is perceptible enough to make it difficult for someone to relax, and when there is no law which makes the activity explicitly legal. Sound components can be: volume, periodicity of beats (especially around 1 second), low and very low frequency beats.

What happens when a neighbor disturbs you with music? You become unable to rest, to think, to perform activities that require mental concentration, and directly degrades your health (see Studies). If you were to leave your home in order to get away from the noise, you would become unable to use your property. Making someone unable to use their property is illegal.

People who listen to music do it for hours, whereas various household activities which may cause disturbing noises last for seconds or minutes, have no beats and don't make the walls pulsate. Flushing a toilet takes a few seconds, but think about flushing it thousands of times, one after another. That's what the beats of music do, every second, thousands of times, while the subwoofer makes the walls pulsate during this time. Home renovation does involve powerful noises, but one family does this only once every few decades (maybe years, for smaller renovations).

People who want to listen to music at a volume higher than that of a normal conversation could use (wireless) headphones. This would let everyone enjoy either quiet or high volume music, without obstructing each other's right.



Legal path

What can you do if you have a noisy neighbor?

First, you might want to talk to the noisy neighbor, maybe he'll stop. If not, check if the noisy neighbor rents the place, and if so, try complaining to the owner. Next, try calling the police to see if their intervention can stop the noise; maybe even make a written complaint (perhaps signed by more neighbors).

If the problem isn't solved, search for laws that penalize the people who make disturbing noise. You may want to check the public disturbance law, or start here. Some governments have extensive understanding and protection of people against noise, such as UK (see Noise policy statement for England), while others might have none.

Then, once you know your rights (with approximation), go to a lawyer to see what can be done through the legal system. Ask the lawyer about:

  • Obtaining an injunction which forbids the neighbor to disturb you with music.

  • Suing the neighbor for obstructing your ability to exercise your right to rest, since the noise makes it impossible to rest. See the legal rights.

  • Suing the neighbor for obstructing your ability to use your property, since the noise makes it impossible to rest and perform various activities in your home.

  • Suing the neighbor for financial loss, if you can't sell / rent your home. If you've made investments over the evaluated sale price, investments that are tied to the home (= that you can't take away), check if you can recover those as well.

  • Suing the neighbor for moving expenses, if your current location is not important to you and you can simply move.

  • Suing the neighbor for the degradation of your health / wellbeing, as a direct consequence of the noise. See the legal rights and the studies.

  • Suing the neighbor for torture. Unwanted music beats, especially the bass, have an effect similar to the Chinese water torture, where the beat is the water drop and the need to stay in the home (to sleep, rest or perform various activities) is the restraints.

First, try to obtain an injunction which expressly forbids the neighbor to disturb you with music. The injunction informs the neighbor, in a legally authoritative way, what your and his legal rights are. If the neighbor breaks the injunction and you prove this with witnesses, like police or other neighbors, the punishment will be more than a small fine. There were cases of people who were sent to jail for breaking an injunction order that forbade them to disturb their neighbors with music.

If you own the home, you could try to sell it and if the buyers refuse to buy because they don't want to live in a noisy place, you can sue the noisy neighbor for devaluation of property or material loss, in order to recover the price (difference).

If selling your home is not an option (because you could end up in the same situation), you could try to rent it. If the renters leave because of the neighbor's music, or if the renting agency blacklists your home from being rentable, you can sue the neighbor for loss of income (for example, to be paid monthly every time a renter leaves before the end of a month because of the music).

The lawyer should be able guide you through the process of choosing witnesses and, possibly, how to get medical evidence of the noise's effect on your health. Witnesses could be other neighbors, previous owners or renters of the home, potential buyers and renters, and the real estate agency that's trying to sell your home.

The lawsuit is not conditioned by the existence of a public disturbance law. Besides, you can't (normally) sue someone based on a law whose punishment is only a small fine.

A lawsuit is a long, expensive and complicated procedure. But, maybe the idea of a lawsuit is enough for the noisy neighbor to think at the consequences and stop.

Before a lawsuit, you should make sure to inform the neighbor, in a legally provable manner (like mediation), that you suffer because of his noise. This way, the noise that the neighbor makes after being informed becomes intentional, something which will have impact in a lawsuit.

Alternatively, you could try to sue that neighbor for causing extreme stress. In this case, you will likely have to prove that music that comes through walls, bass in particular, degrades your health. For this you will likely have to provide the court a medical evidence, like a medical certificate, regarding the effects of that kind of noise. You could start by reading this.

The noisy neighbor might argue that there are no studies which show that noise degrades people's health, and that there is no known mechanism through which noise would have such an effect. While such studies would make your case easy, they are not necessary, but they do exist. You don't have to prove what the noisy neighbor is arguing for.

You should argue that you are the one suing the neighbor for the effect the noise has on you, not on the general population, not on the subjects of a study. Whatever the trigger mechanism is, physical or psychological, the neighbor's music has physical effects on your body. Medical evidence can prove that once music starts, your body responds as if it's under extreme stress.

Psychological evidence isn't very useful because people react differently when subjected to noise. Some people are less sensitive and are not affected, some people can cope with the stress, some people become depressed, and some people handle the stress for a while until they snap and become instantly violent.

If you decide to sue for torture, the defense might claim that since there is no permanent (physical or mental) damage then it can't be called torture. Torture doesn't require permanent damage, it requires pain to be inflicted; an example is torture with electrical shocks.

To get the medical evidence, you will have to reproduce the noisy conditions (like music coming through walls) in a controlled environment, and have medical doctors measure various biological characteristics, like pulse, blood pressure and levels of stress hormones (like cortisol, adrenaline and norepinephrine). While brain scans are also useful to show the activation of the same locations as in the case of pain, it's virtually impossible to get them in this scenario. It might be useful to try to perform a task that you normally do when the neighbor's noise affects you.

You will need to include baselines before the noise starts and after the noise ends (allow some time to pass), to show that only the presence of the neighbor's noise produces extreme stress in your body.

The stress that the controlled environment may cause you would be lower than that produced by the real environment, because in the controlled environment you can stop the experiment whenever you want (so the mental pressure is much lower).

If the neighbor makes noise at predictable times, you can collect the required medical information in your home.

Pulse and blood pressure that are elevated for long periods of time have been associated (in medical studies) to an increased risk of cardiovascular disease, to the point of a severe risk of cardiovascular arrest and stroke.

Cortisol is meant to produce the "fight or flight" response in case of danger, but in the absence of a choice, its effects are physically destructive.

What kind of physician would be most qualified for the collection of this medical evidence? One that deals with stress would likely be best; the next best choice would probably be an endocrinologist.

Noise can even lead to temporary insanity. There were cases of people who were (shot and) killed because they wouldn't stop playing loud music, and because the police either couldn't or wouldn't do anything about the noise.

How do you prove the noise levels? Aside from the police reports, there are the rest of the neighbors and the renters. There are also some accredited governmental agencies (like the Environmental Agency) and private companies that can perform accredited noise measurements on request.

In front of a judge, emphasize the facts below and say that the law should take them into consideration because they make all the difference:

  • Some noises are part of life and can't be avoided, like cleaning, renovating an apartment and road traffic. Some noises can be avoided, like music, since it's possible to listen to music without a subwoofer and at the volume of a normal conversation, or with headphones or in venues that are sound insulated. Cleaning and renovating are necessary to keep a healthy and safe environment, and to maintain a good standard of living. In some countries, maintaining the integrity of buildings and living spaces is a legal requirement.

  • Unwanted music, especially in the very low (/ bass) frequencies, is stressful because its beats disrupts the rhythms of the brain and heart (because the music beats have a periodicity similar to the heart beat), of the activity that people are focused on (including relaxing). People can't think normally at such times.

  • Very low frequencies (like music bass) can also be felt, not only heard, especially very low frequencies (including under the human audible threshold of 16 Hz).

  • Sound patterns make sound perception very different. The difference between sound in general and bass beats, which is a pulsating very low frequency sound, is like the difference between speech (which is called airborne noise) and hitting a wall (with a hammer, or even a hand; which is called impact noise). Bass is a shockwave which hits walls / bodies like a hammer, at every second / beat, making them pulsate with the beats of the music. It is virtually unstopped by walls. It has the same effect on the internal organs, starting with the most sensitive part, the brain.

  • The defendant may attempt to claim that they have a right to listen to music since that right is born from custom, even though very few people listen to loud music or with a subwoofer. At the same time, they may label you as oversensitive (to noise) and dismiss your claim because very few people are oversensitive. You may want to emphasize this duplicity of them justifying their right born from the behavior of very few people, and them dismissing your oversensitivity because very few people have it.

If the noise is coming from a neighboring public place, like a park, you can ask the city hall (who probably administers it) to make specific changes to the park, like dismantling the park furniture (like tables) around which the noise makers gather. If the city hall doesn't respond to your request (check the legal time limit in your country) or refuses to make the changes you requested, you can try suing them for facilitating the noise and therefore your suffering.



Studies

Introduction to the special issue on low frequency noise: Editorial.

Review of studies on the effects of very low frequency sounds and unwanted sounds

Disturbing effects of low frequency sound immissions and vibrations in residential buildings

WHO - Burden of disease from environmental noise: "The total burden of health effects from environmental noise would be greater than one million years in western Europe, even with the most conservative assumptions that avoid any possible duplication."

Epidemiological studies of the cardiovascular effects of occupational noise (Wolfgang Babisch, 1998)

Noise Exposure and Public Health (Willy Passchier-Vermeer, Wim Passchier)

Effects of infrasound: High volume infrasound has been observed to cause: changes in blood pressure, changes in pulse rate, changes in respiratory rate, vibration of internal organs, resonance in inner organs (such as the heart), pressure in the ears, fatigue, apathy, depression, loss of concentration, drowsiness, vertigo, imbalance, incapacitation, disorientation, nausea, vomiting, bowel spasm.

The Ghost in the Machine (Vic Tandy, 1998): Infrasound can cause hallucinations.

Testing the AC/DC hypothesis: Rock and roll is noise pollution and weakens a trophic cascade

Maladaptive and adaptive emotion regulation through music

Sleep increases chromosome dynamics to enable reduction of accumulating DNA damage in single neurons

Silence promotes brain development



Questions and answers



Wireless headphones

See this for details.



Are audio systems without a subwoofer any good?

See this for details.



Measuring noise volume

If you want to measure the noise yourself (which has no legal relevance), you need a sonometer that can detect sound with frequencies below 20 Hz and volumes below 20 dB.

There are many types of dB, but all measurements have to be performed with the same type. For human perception, dBSPL and dBA are usually used (including in legislation).

The sonometer must be multiband, meaning that it has to be able to show the sound volume for separate frequency bands.

Don't waste your money on a sonometer which doesn't have these features, but note that the ones that do have them are extremely expensive.



How is noise volume perceived?

The lowest volume of sound that the average healthy and young person can hear is about 0 dB for a continuous tone of 1'000 Hz. You can read details here.

Sound can still be present even at volumes lower than 0 dB, but humans can't normally hear it. This is because 0 dB is not complete silence, but a threshold for normal human hearing.

Because dB is a logarithmic scale, each subtracted 6...10 dB are perceived as a sound that's half as intense. Each added 6...10 dB are perceived as a sound that's twice as intense. Each 3 dB represent a doubling / halving of the energy of the sound.

All around, there usually is background noise which covers a lot of faint sounds; for example, an empty broadcast studio has a background noise around 20 dB. However, a persistent and percussive noise, like bass, might be heard or just felt through the background noise (especially because this is not necessarily continuous), and this may be disturbing.

A refrigerator usually produces about 40...45 dBA of noise (only high frequencies, no bass), at 1 m distance, in the noisiest stage.

Most people should be able to sleep well even if in the room there is a fan (like from an air purifier) which generates a continuous noise with a volume below 30 dBA. If the noise has beats, especially in the very low frequencies, the volume has to be much lower, as close to 0 dB as possible, because there is no background noise which can cover the beats. A deep, regenerative sleep requires the complete absence of very low frequencies, and an almost complete absence of the higher frequencies.



Is there a difference between hammer hits and music beats?

Yes, there is a difference due to how the sound amplitude / volume changes: nearly straight up for hits, but following a curve for beats.

You may think that a curve allows the body to adapt to the beat, so it's better, but the curve is a pulsation which mimics the way the heart beats work, and this overpowering similarity interferes with the rhythm of the heart beats of people who don't want to follow the external rhythm.



Does sound insulation help?

If very low frequencies (bass) is what's stressing you, then sound insulation can't help. To be able to relax, you would have to eliminate the bass, not simply reduce it. Very low frequencies can't be stopped even with professional sound insulation. You would literally need a home inside a home, with mechanical dampeners and tens of centimeters of professional sound insulation in between them. Save your money for moving elsewhere.

Even worse, sound insulation would block all higher sound frequencies, so the very low frequencies, even if at a low volume, would remain the only thing that your ear focuses on, so they would be more stressing.



What does total silence sound like?

Let's clarify a few things about total silence.

Hearing is a sense of orientation, like seeing. This means that not hearing anything is just as disorientating as not seeing anything when you want to interact with the environment, like move around. That's how the human body has evolved. Because of this, in total silence, the ear will start to focus on whatever it can hear, like heartbeats, blood flow, clothing movement, anything it can anchor to.

Total silence is good for sleeping and relaxation, not when you're active.

In time, you can get used to total silence. Your body will react to that, for example your heart rate will decrease. People who are agitated (they will call themselves energetic or extroverts) will adapt much slower and may have trouble adapting. People with tinnitus are likely to suffer in total silence.

To fix any adaptation problems, add white noise.

If you want to know what true total silence sounds like, ask deaf people.

Here is a short video about the quietest room in the world.



Where to move?

If you want move and build a house which is as quiet as possible, see this.







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