Do you think this can deaden the noise enough so nobody can hear anything? For example; if I had there was an adult male screaming in the back of my trunk?
Great video. I’ve been interested and fascinated with vehicle NVH for many years (since the 80’s). You are very much in point in that the newer cars sound very tinnie. Especially Japanese vehicles (I’m not saying they are worse). I believe they have a different philosophy in acoustic management in comparison to let’s say German cars. Japanese cars tend to have very little acoustic insulation and focus more on just balancing the sounds/noises. Even a Lexus LS sedan has very minimal insulation but is perceived quiet because in my opinion they target the source of the noise producing components. Anyway, in my experience, sound deadening and acoustic sound absorbing insulation do work especially when placed in key areas, however, the quieter you make the car the “ noisier” it will get. If you quiet or reduce road noise the engine or wind noise will then be perceived as sounding louder. You quiet that then squeaks and rattles in the interior will be very prevalent and sound very annoying. What a rant, I’m sorry. Lol. I love videos like these that have a before and after testing and that are very informative.
You are absolutely right! I've gone through these phases on my Honda Jazz. I covered the entire floor, doors, roof, trunk and hood with layers of Noico and Closed Cell Foam, the floor also getting a layer of MLV. My current 'noisier' phase is from the front wheels / tyres / suspension and my NVH mode is still switched on in pursuit :)
Car sound insulation needs more sound insulation and sound absorption materials. Shock-absorbing materials don't have much effect on decibels. The focus of the rear compartment is to fill the voids on both sides of the tires. The shock-absorbing material should not be too much, otherwise it will cause low-frequency pollution, and low-frequency sound insulation is relatively difficult. My car is 110KM/H 71-74 decibels, DIY result is 60-68 decibels. for your information
nearly all Sound proffing'' vids shows just adding butyl, which is really just one of 3 materials you really need. after the butyl, add MLV, and some foam, doing that really makes a much more dramatic difference ,
This material gets rid of vibrations and reverberation. It absolutely won't lower the road noise, but it may change the pitch and do a better job of keeping music in the cabin. It will make more of a difference when listening to music than it will eliminating road noise. Sound deadening is much more complicated than people thing. It takes a lot of time, money, and and adds weight.
It would lower the road noise if you place it on the floor of the cabin. But I agree with you that it won’t lower the road noise by placing this in the trunk. It might if their on the wheel well!
Yea. The basic design of the frame and some holes already designed how road noise get inside the car.. not much you can do. That’s why Mazda was advertising how the resigned the frame to make it less noisy. 😂 Honda needs to step up their game
Although you did a lot of work on the material installation, it doesn't seem entirely scientific. The frequency of the sound is critically important. A decibel reading doesn't give the complete picture. When I have done tests on my own car the biggest percentage of the noise is at very low frequencies, below 2500 Hz. Being able to block and/or absorb those lower frequencies will indeed make for a more comfortable ride experience in the cabin. This may be why with even a small decibel change you may experience a bigger change at certain frequencies that actually make the road noise sensation much more comfortable.
i normally skip videos but i watched and liked this entire video, thanks for your sacrifice of the dollars and letting us contemplate if it's worth it or not
In the early 2000s i fully sound proof my sadan, with flashing tape.. or flexi seal.. way cheaper.. and made huge difference. People said in the summer the heat would make it full off. But.i went over it with bitchmen paint to stop that happening. Probably cost $ 250 all up to to do four doors, boot, and floors.
Guys! What he did in this video is great but, in fact, for a normal sound isolation you need 3 layer. First layer (what he did in this video) it is the vibration layer and part of the sound nois.The second ot will be the termo and sound layer (between 6-12 mm thick) and the 3rd layer is just the sound layer ( a phono absorbant sponge at arround 15mm thick). This way you will see a great change, having all 3 layers not just the first one, the vibration absorber layer that it is shown in this video. It is great that you can see a change with just this one but, it is much more to be done for your sound isolation than just this.
I did my trunk door, the other 4 doors, and the ceiling. Measured with my phone at speeds over 130km to 160km/h my noise was at arround 84db. Until 110km/h was just under 80. So, I would recommend the wheel fairings, the floor and the hood. This should be the most noisy parts of a car because of the road noise and the engine. All the other parts should not be as important as what I said but my car did have some vibration layers on all the parts I did the sound proof.
It wouldn’t stick to the surface. Something like a sound deadening spray could be used in those areas. I could make a follow up video with that type of product.
Don't forget the icing on top - Mass Loaded Vinyl layer in the trunk and under the floor. Achieved close to a dB reduction on my Honda Jazz, just with this.
Good morning, can you try putting a layer of 1" thick black rubber foam onto the inner wall of tires. Try doing first the front two tires and do a sound test before later doing the same for the two rear tires. Let us know the value of each tire balancing before & after layering with inner foam. Then do a follow up video after 10,000 miles for db valve vs balancing value of tires vs opening up the front two tires to verify the bonding status of rubber foam onto tire inner wall. 🤣🤣🤣🤣. Regards.
i dont get the interest of this video.... this was just 1 layer for vibration not dicrease sound ! it need as 2nd layer a Foam soundproof and even like for this trunk a "rd one more heavy is waht do profesional ! is totaly usless what you did. or change the title if putint just that layer againt vibration will decrease the sound. i fault i was on a pofesional youtub channel :'(
A fabric headliner with a polyfill backing added (in addition to adding cheaper sound deadening material) is a great way to lower the road noise. Yes adding sound deadening to the floor, (and)doors, and adding closed or open cell foam in between the outer and inner skins r also inexpensive ways to reduce road noise. I've personally been able to reduce my ambient road noise by at least 3db. Also I'm only halfway done with my vehicle so hence y I say at least. (It's been 3db already and I'm not finished yet. I still have 2 more doors and 2/3 the floor to add material to.)
I also want to add that on this video you are treating the trunk of a sedan car. I assume, if that was a hatchback or a van where the space is open, the results of dB dropping would be greater :)
Good point, also the Accord has some decent factory sound deadening. I have a Civic Coupe and it doesn’t have any of that factory deadening in the trunk.
Yeah, not worth it really for just one decibel. I wonder what product you could add to the back of the seats, so when they're up there can be a layer of sound deadener behind them. Maybe a curtain or mlv?
@@soundproofguide I'm insterested, indeed. Although people with subs in the trunk might actually want the opposite. I don't have anything in the trunk, so de isolation of that space idea really calls my attention. Regarding MLV, it only comes in small panels, and that could be a problem. Do you know where one can order large sheets? Thanks, man!
2:04 not true that 3dB cuts noise by half. 3dB means a 50% cut in physical sound energy but the way the human ear/brain works humans can barely tell 3dB difference and 1dB is simply not perceptible.
Idk man I drive a car with a loud exhaust. 3db is about the difference between cruising with very little drone, and stepping on the gas in the highway. Very noticeable difference for me
Do you think this can deaden the noise enough so nobody can hear anything? For example; if I had there was an adult male screaming in the back of my trunk?
Haha no, you’d hear the poor guy scream…
@@soundproofguide not that I need to have another human trapped in my trunk in my trunk against their will haha (don’t report me)
😂😂😂
Great video. I’ve been interested and fascinated with vehicle NVH for many years (since the 80’s). You are very much in point in that the newer cars sound very tinnie. Especially Japanese vehicles (I’m not saying they are worse). I believe they have a different philosophy in acoustic management in comparison to let’s say German cars. Japanese cars tend to have very little acoustic insulation and focus more on just balancing the sounds/noises. Even a Lexus LS sedan has very minimal insulation but is perceived quiet because in my opinion they target the source of the noise producing components. Anyway, in my experience, sound deadening and acoustic sound absorbing insulation do work especially when placed in key areas, however, the quieter you make the car the “ noisier” it will get. If you quiet or reduce road noise the engine or wind noise will then be perceived as sounding louder. You quiet that then squeaks and rattles in the interior will be very prevalent and sound very annoying. What a rant, I’m sorry. Lol. I love videos like these that have a before and after testing and that are very informative.
You are absolutely right! I've gone through these phases on my Honda Jazz. I covered the entire floor, doors, roof, trunk and hood with layers of Noico and Closed Cell Foam, the floor also getting a layer of MLV. My current 'noisier' phase is from the front wheels / tyres / suspension and my NVH mode is still switched on in pursuit :)
3db is a reduction of 50%. Sound follows a Logarithmic scale.
Car sound insulation needs more sound insulation and sound absorption materials. Shock-absorbing materials don't have much effect on decibels. The focus of the rear compartment is to fill the voids on both sides of the tires. The shock-absorbing material should not be too much, otherwise it will cause low-frequency pollution, and low-frequency sound insulation is relatively difficult. My car is 110KM/H 71-74 decibels, DIY result is 60-68 decibels. for your information
nearly all Sound proffing'' vids shows just adding butyl, which is really just one of 3 materials you really need. after the butyl, add MLV, and some foam, doing that really makes a much more dramatic difference ,
This material gets rid of vibrations and reverberation. It absolutely won't lower the road noise, but it may change the pitch and do a better job of keeping music in the cabin. It will make more of a difference when listening to music than it will eliminating road noise. Sound deadening is much more complicated than people thing. It takes a lot of time, money, and and adds weight.
It would lower the road noise if you place it on the floor of the cabin. But I agree with you that it won’t lower the road noise by placing this in the trunk. It might if their on the wheel well!
Yea. The basic design of the frame and some holes already designed how road noise get inside the car.. not much you can do. That’s why Mazda was advertising how the resigned the frame to make it less noisy. 😂 Honda needs to step up their game
And choosing the right tires for the driving noise makes a lot of difference.
why not install exterior wheels arch?
Although you did a lot of work on the material installation, it doesn't seem entirely scientific. The frequency of the sound is critically important. A decibel reading doesn't give the complete picture. When I have done tests on my own car the biggest percentage of the noise is at very low frequencies, below 2500 Hz. Being able to block and/or absorb those lower frequencies will indeed make for a more comfortable ride experience in the cabin. This may be why with even a small decibel change you may experience a bigger change at certain frequencies that actually make the road noise sensation much more comfortable.
Thanks, no one suspects anything now that the muffled voices coming from the back of my vehicle are gone!
i normally skip videos but i watched and liked this entire video, thanks for your sacrifice of the dollars and letting us contemplate if it's worth it or not
Do you have an aftermarket sound system in there? What kind of tweeters are in your sail panels?
In the early 2000s i fully sound proof my sadan, with flashing tape.. or flexi seal.. way cheaper.. and made huge difference. People said in the summer the heat would make it full off. But.i went over it with bitchmen paint to stop that happening. Probably cost $ 250 all up to to do four doors, boot, and floors.
Interesting! Thanks for sharing!
Are you going to sound treat the headliner too?
Wack install
How long will it take to compare with Amazon products?
Guys! What he did in this video is great but, in fact, for a normal sound isolation you need 3 layer. First layer (what he did in this video) it is the vibration layer and part of the sound nois.The second ot will be the termo and sound layer (between 6-12 mm thick) and the 3rd layer is just the sound layer ( a phono absorbant sponge at arround 15mm thick). This way you will see a great change, having all 3 layers not just the first one, the vibration absorber layer that it is shown in this video. It is great that you can see a change with just this one but, it is much more to be done for your sound isolation than just this.
Thanks for the info. Which parts of the car do you recommend deadening the most?
I did my trunk door, the other 4 doors, and the ceiling. Measured with my phone at speeds over 130km to 160km/h my noise was at arround 84db. Until 110km/h was just under 80. So, I would recommend the wheel fairings, the floor and the hood. This should be the most noisy parts of a car because of the road noise and the engine. All the other parts should not be as important as what I said but my car did have some vibration layers on all the parts I did the sound proof.
Great video. Thanks!
Thanks for sharing this informative video.
You're wrong on decibels. 3db is half the power. 10db is half the volume to human ears. 3db is noticable, but not half the volume.
1 db no
Why did you not put it over an existing sound insulation in the trunk?
It wouldn’t stick to the surface. Something like a sound deadening spray could be used in those areas. I could make a follow up video with that type of product.
Love the video! And what about adding to this extra layer of rubber foam? Is it going to lowers the measured dB?
Thanks! It should lower the db a bit more yes.
Don't forget the icing on top - Mass Loaded Vinyl layer in the trunk and under the floor. Achieved close to a dB reduction on my Honda Jazz, just with this.
Good morning, can you try putting a layer of 1" thick black rubber foam onto the inner wall of tires. Try doing first the front two tires and do a sound test before later doing the same for the two rear tires. Let us know the value of each tire balancing before & after layering with inner foam.
Then do a follow up video after 10,000 miles for db valve vs balancing value of tires vs opening up the front two tires to verify the bonding status of rubber foam onto tire inner wall. 🤣🤣🤣🤣. Regards.
Want to collaborate on that video? 🤣
i dont get the interest of this video.... this was just 1 layer for vibration not dicrease sound ! it need as 2nd layer a Foam soundproof and even like for this trunk a "rd one more heavy is waht do profesional ! is totaly usless what you did. or change the title if putint just that layer againt vibration will decrease the sound. i fault i was on a pofesional youtub channel :'(
A fabric headliner with a polyfill backing added (in addition to adding cheaper sound deadening material) is a great way to lower the road noise. Yes adding sound deadening to the floor, (and)doors, and adding closed or open cell foam in between the outer and inner skins r also inexpensive ways to reduce road noise. I've personally been able to reduce my ambient road noise by at least 3db. Also I'm only halfway done with my vehicle so hence y I say at least. (It's been 3db already and I'm not finished yet. I still have 2 more doors and 2/3 the floor to add material to.)
20% coverage today =1 db 100%will be close to 5db but thats alot of work ... dont forget above the head liner
Speak normal, dude...no pauses...good vid btw
This video seems a bit sus? ;)
Could you please elaborate? I welcome constructive criticism. :)
I also want to add that on this video you are treating the trunk of a sedan car. I assume, if that was a hatchback or a van where the space is open, the results of dB dropping would be greater :)
Yes it definitely would be. That's why I have the seats down to simulate more of a hatch back like situation.
@@soundproofguide Awesome, didnt catch that 😅
Good point, also the Accord has some decent factory sound deadening. I have a Civic Coupe and it doesn’t have any of that factory deadening in the trunk.
Yeah, not worth it really for just one decibel. I wonder what product you could add to the back of the seats, so when they're up there can be a layer of sound deadener behind them. Maybe a curtain or mlv?
A curtain wouldn’t do it but maybe a layer of MLV. Maybe something I could try for a later video if it’s something people would watch..
@@soundproofguide I'm insterested, indeed. Although people with subs in the trunk might actually want the opposite. I don't have anything in the trunk, so de isolation of that space idea really calls my attention. Regarding MLV, it only comes in small panels, and that could be a problem. Do you know where one can order large sheets? Thanks, man!
2:04 not true that 3dB cuts noise by half. 3dB means a 50% cut in physical sound energy but the way the human ear/brain works humans can barely tell 3dB difference and 1dB is simply not perceptible.
What are u talking about 3db is not a small difference
Idk man I drive a car with a loud exhaust. 3db is about the difference between cruising with very little drone, and stepping on the gas in the highway. Very noticeable difference for me