Best Sound Absorption Materials - www.AcousticFields.com

[@simplyhard]

I get the point; there's no universal sollution that's perfect for every application. Still, the video is titled "Best Sound Absorbtion Materials" yet you barely mention any materials, or give any concrete tips. Nothing is discussed in depth and addressed appropriately. "Everything just depends on something" mentioned in the passing and then the video is over. It's very vague, and I learned nothing from watching it. In the future, it might be useful to have a clear idea and direction for these kinds of videos, and to title them properly.

[@AcousticFields]

If I spent time going through each situation along with the associated treatment types, it would not be relavent. People would adapt and change general guidelines to fit their situation and fail in the attempt due to the specificty of treatment/solution paradigms..

[@LunicussOfficial]

@@AcousticFields I think Knekt here was suggesting that if it's not actually possible to actually discuss the topic described by the title, then maybe change the title. "Why there is no universal best sound absorption material" would be a more accurate title, for example.

[@kevinlentz7604]

What a whiner,totally disagree great work Dennis totally agree

[@deanryder4922]

This guy is nothing but a salesperson for his own products and never gives you specifics

[@g1technicalservices736]

This is an awesome channel. I love the direct / no non-sense approach.

[@AcousticFields]

Glad you enjoy it!

[@jeronimo585]

Thank you for the explanation. I have a question. What material would work best in a wooden cabinet with a 3d printer inside? The box is around 60x60x80 cm. The db is between 40 and 62 hz at highest. The frequency is at 2 levels very noticable: 1500 hz and 3400 hz. The lowest frequency comes from the fan and is 300 hz, but is not a sound that needs special attention in my opinion. The main objective is to make it less loud when the cabinet is locked. The plan was to cover the walls of the cabinet with polyurethane foam panels, but I would first like to have a professional opinion on the matter. Thank you for your time.

[@AcousticFields]

If your numbers are accurate, you will need to have the proper rate and level of absorption to manage those frequency ranges. A 300 hz. resonace will require a certain depth and you will need a certain depth to deal with a 40 - 60 dB SPL issue. The depth will have to be calculated along with rate of absorption.

[@xsavoie1]

It's for a water pump to get rid of water going off at about every 2 minutes at spring time.I intend to build a box over it with sound absorbing material inside the box.

[@AcousticFields]

What is the frequency and amplitude (strength) of the noise? If its an electric device, you must allow for air flow to keep from overheating.

[@IAMKRITAGYA]

Can i Make Acoustic panel with cotton????Plz answer me I will Start

[@AcousticFields]

You must know the rate and level of absorption of any material type.

[@IAMKRITAGYA]

@@AcousticFields Sir Plz Direct Answer me Can i Use Local Cotton Instead of Rock wool or fabric glass because Cotton is available and these 2 arr not...I have heard cotton too absorb good amount of sound.....

[@mohanshiva_musical]

​@@IAMKRITAGYAHe will tell to buy his products 😜😜😜

[@recordman555]

Dennis, I really appreciate your "just the facts" approach to acoustic treatment. In his video, you kept emphasizing amplitude/frequency. When I hear those two terms married together, I think EQ. Aside from taming reverb, could it be said that a well-treated room acts as an EQ in itself? The principles and physics of this discipline are amazing!

[@AcousticFields]

Yes, a room is an EQ device. It can attenuate or exaggerate certain frequencies.

[@aidannbrownn]

@@AcousticFields best way ive ever heard that put. thank you

[@AcousticFields]

It is best to EQ your room first and foremost in the analog domain. Once the room pressure and reflection issues are managed correctly, it becomes much easier to hear all gear output qualities good and bad.

[@AdamWellsMusic]

This wasn’t what I was looking for but it actually was

[@AcousticFields]

Every frequency and amplitude of noise transmission and sound absorption requires a different technology to manage. Lower frequency energy is a pressure based issue that must be treated with a pressure based sound absorption technology. Middle and high frequency ray energy requires a sound absorption technology that works on molecular velocity (air flow) across its surface areas.

[@AdamWellsMusic]

@@AcousticFields I was looking for a short answer but now that I understand what you’re saying I realize that it really is a short answer. Thank you. I’ll definitely go back and make some notes on your instructions.

[@AcousticFields]

@@AdamWellsMusic When it comes to absorption and diffusion in small rooms, there is no one size fits all issues.

[@AaronWalker-vs2jt]

There are new meta-materials coming out that take advantage of multiple absorption principles (the generally don't use porous absorbers) that will blow all these away. They tend to use combinations of Helmholtz, microslit, and Fabry-Perot absorbers. They are tuneable, customizeable, more compact, and very effective.

[@AcousticFields]

They lack lower frequency efficiency so no blowing anything away here.

[@AaronWalker-vs2jt]

They have smooth and adjustable/customizeable frequency responses that are capable of providing high absorption (.9+) from 400-8k (just one example) at just 18 cm deep (if my memory is correct). Stacking micro-perforations are apparently going to be even better but those papers have not been published yet. They won't be replacing materials designed for less than 250, but I think some of the newer micro-slit absorbers (papers not yet published) might be reaching down to 250 hz with .9+ coefficients. The question is if they will be able to be put to the market at a reasonable price. Eventually they will be, but I don't know if that will be in 5 years or 50 years. @@AcousticFields

[@AaronWalker-vs2jt]

just learned that they are actually going under 250 hz already with micro-perforated panels. @@AcousticFields

[@neaumusic]

250hz is not low at all, even 80hz is not that low, 30-50 is low

[@AaronWalkerGypsyJazz]

Compared to what and at what coefficient? 250 with .9 coefficient is already beating fiberglass panels. Also they are already commonly available and cheaper and easier to install than helmholtz resonators. I am working on a project right now using them. John Storyk is using them in his studios. And that is just gen 1 micro perf technology, the newer techs haven't been commercially implemented yet.

[@karangupta617]

I have a hall which is being used for a contact center. The hall is 40 x 15 and it has open tables. The ceiling is aroudn 12 ft high. Do you think making partitions on the tables to separate out the seats would work to reduce echo and disturbance between the seats due to people talking on phone? If yes, then what material could be the best for the partitions so that it absorbs sound.

[@AcousticFields]

Your issue is reverberation not echo. The cause is reflections from the four walls and ceiling. They must be treated

[@mrcrowleyoz]

What’s the best material to hang on the walls and floor if I live in an upstairs apartment and want to play the saxophone. The apartment has no insulation and has 1/2” drywall. Vinyl floor.

[@AcousticFields]

What are the frequency and amplitudes of the noise you are dealing with. Without nowing that important data, you can not design the proper barrier.

[@kristofaxelson5088]

Hanging something on the wall will not substantially affect sound transmission between rooms.

[@6stringsandapick]

Best sound absorbing material.....Vacuum of space! I guess that's not a material, but I have often wondered if there could be a way to structure a vacuum panel/chamber and get some absorption out of it. Obviously the material it is made of would matter. Might be able to create a Helmholz Vacuum chamber? Fluids have also interested me. Not sure how to do it, but fluids might be able to absorb some energy. Expensive things to experiment with!

[@AcousticFields]

We use a similar system inside our diaphragmatic absorbers. The carbon inside our units actually lowers the pressure levels inside the sealed cabinet. It is not a vacuum. However, the pressure inside the cabinet is less than outside the cabinet where the wave energy originates. When the pressure wave strikes the two front walls which are out of phase with each other, it slows down before entering the cabinet. Inside the cabinet, it "sees" this reduced pressure level due to the 50 lbs. of carbon and it collapses producing attenuation.

[@adelkharisov]

@@AcousticFields so, cause kitchen cabinet (mdf box, hardwood facade) with stuff or similar furniture is not sealed it can not work as a diaphragmatic low freq.absorber, wright? I wonder, cause I mainly listen music in the kitchen.

[@poisonapple1991]

Thanks for the informative video. Could you share any methods to test the resonant frequency of objects in a room?

[@AcousticFields]

Consult with local vibrational acoustics lab.

[@davidaudio88]

Thank go di found this channel, i just started treating a new room im moving

[@AcousticFields]

Lets look at the problem/solution paradigm before you move. It may be cheaper to fix with treatments.

[@mariadanielle7023]

Hi Dennis, what is the best way to eliminate the sound and vibration of my house , due to heavy traffic, over an unpaved road, that is 50 feet from my house, and is running over a huge drainage into the harbor. I have felt the vibration as small quakes followed creaking of walls and ceilings. I’m actually worried since the highway Dpt. Will not be repairing the road for another 2 years. It has been suggested to do blocking the joists in the 4feet crawl space, which has helped a little. hopefully you can help. I welcome any wisdom.

[@AcousticFields]

You must measure the frequency and amplitude of all noise transmission issues. Without numbers, you are guessing. Guessing with noise is both foolish and expensive.

[@mariadanielle7023]

@@AcousticFields thank you for the quick response I will measure ASAP.

[@grandtester4887]

What would the best material be to implement in a ventilated box for an inverter generator running at around 58-65 decibels to make it quiet enough so you can run it at night while camping without bothering the neighbors or yourself?

[@AcousticFields]

What is the frequency range.

[@AngloSaxon1]

It’s funny how many ways there are to make a studio quiet. I use thick Carpet tiles on my studio walls, and it sounds great. I got the idea from a fellow voiceover who carpeted his room and then used carpet tiles on his walls, and sounds as good as a whisper room. And such a cheap way to do it.

[@AcousticFields]

Unfortunely, with this tactic there is no low frequenc y absorption. With 1/2" carper thickness, you are starting at 200 hz. and moving up. Sometimes what costs nothing is worth nothing. This is how it goes with these types of tactics.

[@AngloSaxon1]

@@AcousticFields thanks for the reply and the advice. It works for me, I am a voiceover artist and I wouldn’t be able to work it it didn’t work. Maybe when I have some spare cash I will look at other ways to treat my studio. But for now it works great.

[@platomojo]

Fantastic info. Thank you

[@AcousticFields]

Glad it was helpful!

[@jeffh1405]

Could ypu please elaborate on what you mean when you say too mich energy for too small a room. Is this too high amplutude? Too large speakers/subwoofers?? Any recommendation for 2 subwoofers diameter/power for 330 sq foot room for example? Thanks

[@AcousticFields]

Thin of your room as a jewelry box. The box can only hold so much jewelry. If you put to much in the box the lid will not close. The same thing applies to rooms which are boxes. The dimensions of the room will dictae how much energy the room will hold before it overflows the room size and volume. The amount of energy a room can hold depends on its size and what usage you are foing to require within that room.

[@djhmax09]

👌I don't know what else to say other than thanks for the helpful video!

[@AcousticFields]

Glad it helped!

[@Hv1245]

What would you recommend to reduce the sound in my house from the rain hitting my metal roof during heavy rain.I’ve seen 85 db in my living room.with frequency between 100to 1000 Hzs.

[@AcousticFields]

Noise transmission issues require a barrier design that compliments the frequency and amplitude of the noise. With the stated frequency range, you are looking at a barrier that is 6" deep with multiple material types.

[@levijessegonzalez3629]

when building a broadband absorber, is it wise to use thick plywood on the BACK of the panel?

[@AcousticFields]

We use 1" MDF to achieve the required density of 4.5 lbs. / sq. ft.

[@enermaxstephens1051]

What's the best material for dampening the sound from generators? Say you have a generator, with that very loud engine noise. And you build a little 10x10' room for it. Which material should you use to kill the sound as much as possible?

[@AcousticFields]

What does "loud engine noise" mean? With noise, you must measure frequency and amplitude (strength) of the noise. The barrier you build to attenuate noise transmission is directly based upon the frequency and amplitude of the noise. We can assist you with the measurement process. [e-mail]

[@oinkooink]

What do ya's think about polyester panels for low freq absorbtion?

[@AcousticFields]

They wont go low enough or get enough.

[@oinkooink]

@@AcousticFields Thanks.

[@jimhenry1262]

I'm a formulation chemist working on numerous sound and thermal insulation attenuation coatings for ships and various marine engine rooms, where we need to attenuate 30 hz to 300 hz. I have found that cotton bath towels are a cheap but somewhat effective for certain Hz. But not applicable for naval and or marine application. Great to watch. I have been listening to your tutorials for several years.

[@AcousticFields]

They will work above 125 Hz. What's the lowest frequency you can get with your coatings? Thickness? Density?

[@jimhenry1262]

@@AcousticFields Thanks for the feed back. Our biggest bugaboo, is at 30Hz. The low end "thrumming" is like a bunch of base drums from the adjacent diesel engine room and or gensets, reverbing through the steel bulkheads, and intruding into the crew quarters and the safety concerns of not exceeding 80 plus decibels in human habitable areas. We usually stick to 3 to 5 mm attenuation panels. I cannot divulge any more, but I am restrained by a not to exceed thickness, as well as not to exceed costs per square meter.

[@levijessegonzalez3629]

what's a good non toxic cheap material for bass traps? and broadband Absorption? I was interested in the ecoose insulation panels but a lot of people online said they had bad reactions to even those!

[@qigong1001]

Question: just bought an upright piano and I didn’t realized how freaking loud that stringed coffin is! How would you quiet down the sound coming out of the back, a few inches from a shared wall with a neighbor? Goal being to prevent sound transmission to the neighbor and also deaden the loudness and reverb inside the room with piano. (Piano in a living room, nowhere else to put it). Piano store suggests stuffing holes in the backside with 3”furniture foam. Low cost please. Thanks to anyone responding.

[@AcousticFields]

Let's step back and examine the issues. The string board of the piano whether upright or concert style, is a large speaker. You have taken a large speaker and placed it aginst a wall. That wall is also shared with a neighbor. You have two issues. You have a noise transmission issue along with SBIE speaker boundary interference effect. The cheapest solution for the noise transmission issue is to move source (piano) away from the common wall. If that is not sufficinet reduction in noise transmission, you will have to build a new room within your existing room to isolate the sound transmission. Treating just the common wall will not work. Flanking noise will go over, under, and around the common wall.

[@chadkayser3691]

Here's more your route: kzbin.info/www/bejne/fZjcdWZmnseEa6M Read the comments down below that video as well. I've heard of people putting blankets in their piano

[@qigong1001]

@@chadkayser3691 awesome thanks! First thing we did was get a carpet and put it under the piano and that seems to help a little with reverb. Now just the back…

[@TruthDefender]

very informative, thanks

[@AcousticFields]

Glad you enjoyed it!

[@blacktoothgriner]

For rate and level will perforated material over the fiber/ insulation help defuse at a knowable rate and level? I have seen control rooms of the past with what looked like peg board tiles.

[@AcousticFields]

A perforated absorber is just that an absorber. A tool that is used to create a diffused sound field is much more complicated. Look at quadratic diffusers. www.acousticfields.com/product/sounddiffuser-acousticdiffuser-qd17/

[@Anythingforfreedom]

I have a 65 decibel machine, that I want to run around the clock (in-side the house) without disturbing my neighbors. Would acoustic panels be my best approach, or some kind of active noise cancelling device. I’ve been searching for hours and I don’t know.

[@AcousticFields]

Wall hanging panels are for sound absorption. They do nothing for noise transmission. What is the frequency of your noise issue?

[@sauravajmera_cgd_mdes216]

can terracotta tiles help in sound absorbing?

[@AcousticFields]

What is the frequency range of your sonic issues and what is the absorpcient coefficients of the terracotta tiles?

[@khanscombe619]

I want to sound dampen VitaMix Pro 500 blender. Minimal thickness materials in 2 parts Lower motors base surrounds & a slip over cover for container. Idk what my frequencies are yet but lot of highs. Out loud it’s up to 93-95 dB. I’m ok w/ bringing down to 62-66 dB

[@AcousticFields]

What are the frequency and amplitudes of your noise issues? All noise must be measured.

[@khanscombe619]

@@AcousticFields idk have a means to measure yet. But if u ever been to a Jomba Juice or Starbucks, it in that family of noise range. They make their commercial cover for certain models out of a polymer clear plastic. It works but I think we can improve. & I don’t need it to be transparent

[@priyankasuryawanshi566]

Hello sir can you eloborate the requirement of absorption at low frequency.

[@AcousticFields]

Excess low-frequency energy within small rooms must be absorbed. Pressure is not a candidate for diffusion.

[@radiczofficial]

My friend lives in an old house that is made out of "adobe brick (mud + hay)" and in his room there should be a very big problem with 42 hz, because width and lenght are the same. But in reality the room has a slight problem with that frequency. I assume that type of building block has a little low frequency absortion. Or something like that.

[@AcousticFields]

Adobe brick is a miniature diaphragmatic absorber.

[@trinchezito1383]

i'm looking for one that's good to absorb engine noise coming into the inside the car

[@AcousticFields]

You are going to have to give up 4-6" of space to treat.

[@banml8478]

sir, what is the best sound absorbing materials in cars.

[@AcousticFields]

Cars are very small rooms. The same absorption technologies used in small rooms can be used in cars. We have had customers use our carbon technology in the truck of their cars to absorb low frequency pressure.

[@BenM81]

I’ll tell you what I’m doing. I want to use a track saw to build cabinets inside my 2nd bedroom of my condo. I don’t want the neighbors to be bothered by the sound of the blade cutting the plywood.

[@AcousticFields]

Do your cutting when the neighbors are not home. This is full range noise that will require a permanent contruction fix.

[@hannes1734]

Can anyone tell me how wood fibre (a dense one, like 250kg per cubic meter so that it's a solid plate like a plank) acts as an absorber for highs and mids?

[@AcousticFields]

We do not have any data on this issue.

[@FreeGenerationtv]

I like how you gave info but nothing too practical so you can still sell us something good thanks for the help

[@AcousticFields]

Education first. Most belief systems regarding acoustics are based on a general ignorance of the facts.

[@the_newvoice]

Hallelujah!

[@AcousticFields]

There is no one size fits all for sound absorption treatment types. You must identify the frequency and amplitude of your usage, take the room size and volume into account, cover enough surface area, use the correct rate and level of absorption, and this is just the beginning of the process. Think TAP: type,amount, position when it comes to any sound absorption technology.

[@the_newvoice]

@@AcousticFields TAP it is) Thanks for advice!

[@MuzikSonics]

People want to know the best in terms of absorption for the few most common applications - broad band, bass traps and mid / high frequencies in rooms with sheetrock walls. It's not objective, it's science.

[@AcousticFields]

There is no best. This is what most people do not understand. Room size, volume, usage, pressure levels all come into the equation. Looking for simple in achieving room resolution is a recipe for failure.

[@MuzikSonics]

@@AcousticFields There are known, affordable, reasonably complex (and measurable / listenable) solutions. Over - - complicating when most customers have limited budgets is a recipe for fiscal irresponsibility and non - value add results.

[@johnfeliciano8606]

@Acoustic Fields - What’s the best layer or layers I could attach to my ceiling to block out my upstairs neighbor who has bowling balls for feet?

[@AcousticFields]

With noise, you must measure the frequency and amplitude of the noise over a seven day time period. You design for the maximum pressure on whatever day it occurs. The barrier design is frequency and amplitude dependent. You must know the noise numbers.

[@eternalknyght7378]

Literally didn't give any answers or solutions.

[@AcousticFields]

You are missing the point. There are no "best" material types. You must use the material type that has the best rate and level of absorption for your room usage issues.

[@jackc8120]

It's typical of him. He never does. Just a sales pitch. His carbon BS doesn't work. My friend used his carbon technology and had to throw it out. Stay away

[@chrisbellette9181]

So…what you’re saying is…it depends hehe 😉 thanks for breaking it down :)

[@AcousticFields]

Everything in acoustics depends on many variables. Nothing is simple when it comes to absorption or diffusion.

[@wishicouldarduino8880]

Well I'm off on acoustics now .....knew I shouldn't have built that amp.........😁👍

[@AcousticFields]

Be careful, Once you fall into the room, you may never come out.

[@sarcasmo57]

A real chalk board. Nice.

[@AcousticFields]

Easier to light than a whiteboard. However, it must be wet and dry wiped after each video.

[@kellystigger9318]

Best means the ultimate thing. If that were possible or probable, there would be no need to inform or suggest anything. There can be layers or systems or things, but best is not an option.

[@AcousticFields]

Every material type is frequency and amplitude dependent. What will work for one set of issues, will fail if used for others. Take noise below 125 Hz. and noise above 125 Hz. Below 125 Hz. , the barrier material types change along with their densities and construction methodologies. People think that you can use the same materials and construction methodologies no matter what the frequency of issues are. That is a recipe for failure and failure usually means that you have to demo everything and start over.

[@jackmithen]

The videos are advertising- why would he want to give any specific answers?

[@AcousticFields]

If you want specific answers then you will have to ask specific questions. There is no one size that fits all applications.

[@ilovevaycay]

👍

[@AcousticFields]

Thank you for your support

[@worldsyoursent.1635]

💪💪💪💪💪💪💪💪

[@AcousticFields]

Thank you

[@VM-oi3dk]

Right off the gate, this guy’s condescending attitude is annoying. Of course you want to find out what’s the best solution. So what if it all depends on the situation.

[@AcousticFields]

You can not find out the better solution without knowing that your solution is not adequate. Once you realize that, you can improve. My attitude comes from everyone making the same mistakes over and over again and not understanding they can not achieve it.

[@AcousticFields]

not achieve their goals at all.