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

Thanks for sharing this informative video.

Great video. Thanks!

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.

@mateen33449

Жыл бұрын

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 :)

Thanks, no one suspects anything now that the muffled voices coming from the back of my vehicle are gone!

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

Do you have an aftermarket sound system in there? What kind of tweeters are in your sail panels?

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.

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.

@soundproofguide

Жыл бұрын

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!

@noobwow2009

10 ай бұрын

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

@hiper59

8 ай бұрын

And choosing the right tires for the driving noise makes a lot of difference.

How long will it take to compare with Amazon products?

why not install exterior wheels arch?

Love the video! And what about adding to this extra layer of rubber foam? Is it going to lowers the measured dB?

@soundproofguide

Жыл бұрын

Thanks! It should lower the db a bit more yes.

@mateen33449

Жыл бұрын

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.

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 ,

3db is a reduction of 50%. Sound follows a Logarithmic scale.

Are you going to sound treat the headliner too?

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.

@soundproofguide

10 ай бұрын

Interesting! Thanks for sharing!

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.)

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?

@soundproofguide

Жыл бұрын

Haha no, you’d hear the poor guy scream…

@JayAcez

Жыл бұрын

@@soundproofguide not that I need to have another human trapped in my trunk in my trunk against their will haha (don’t report me)

@GREEKKINGG

Жыл бұрын

😂😂😂

Why did you not put it over an existing sound insulation in the trunk?

@soundproofguide

Жыл бұрын

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.

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.

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.

@soundproofguide

Жыл бұрын

Want to collaborate on that video? 🤣

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 :)

@soundproofguide

Жыл бұрын

Yes it definitely would be. That's why I have the seats down to simulate more of a hatch back like situation.

@1994jimi

Жыл бұрын

@@soundproofguide Awesome, didnt catch that 😅

@fordon20s

Жыл бұрын

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.

1 db no

20% coverage today =1 db 100%will be close to 5db but thats alot of work ... dont forget above the head liner

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

Жыл бұрын

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..

@lohengrinknight

Жыл бұрын

@@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!

Wack install

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.

@nivshitrit248

Жыл бұрын

What are u talking about 3db is not a small difference

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.

Speak normal, dude...no pauses...good vid btw

This video seems a bit sus? ;)

@soundproofguide

Жыл бұрын

Could you please elaborate? I welcome constructive criticism. :)

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 :'(