Carpet Over Dynamat? (1 Viewer)
- Thread starter jaymar
- Start date
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Dynomat does not alter dimensions that affect carpet installation. I prefer more to less when it comes to padding and insulation.
PO did dynamat under my factory carpet with minimal shifting. Approach with confidence.
Somebodyelse5
16124-75030
dude go watch some videos, it's really well covered out there.
- Thread starter
- #5
After checking out the video posted by @Somebodyelse5, you gotta wonder if any of this stuff is even worth the time, let alone the cost. He's got at BEST a 4-5db improvement after a combined half-inch of butyl, foam, mass-loaded vinyl under the stock interior pretty much everywhere including the ceiling. He didn't check insulating effect, but still....
Or is there an improvement you can hear that the sound meter isn't picking up?
Or is there an improvement you can hear that the sound meter isn't picking up?
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Somebodyelse5
16124-75030
That’s up to you to decide.
Keep in mind the decibel is a logarithmic scale… so, a 3 decibel change is twice the power. A 10 decibel change is perceived as twice the volume.
So 4 decibel decrease is actually quite a bit
That reduction of 4-5db is averaged across the entire spectrum of frequencies. Some specific frequencies are certainly down multiple times over the 4-5db overall he said and some may have actually increased. Which ones are reduced is what actually matters and depending on what those are it might make a big difference to being able to hear/perceive the car being quieter. In HVAC for example, the frequency made by air moving out of a diffuser is very disruptive to human hearing and thus the diffusers are chosen specifically to be louder to help make an office seem less noisy. Same idea as a white noise machine.
Overall, yes its probably not worth it to go all out but you will feel a real improvement if you can get rid of the resonance in your body panels and you don't need full coverage with butyl to achieve that
Overall, yes its probably not worth it to go all out but you will feel a real improvement if you can get rid of the resonance in your body panels and you don't need full coverage with butyl to achieve that
- Thread starter
- #8
Mmmkay sent me down the rabbit-hole on this one, found this...
"To illustrate, a 20 dB sound is 10 times more intense than a 10 dB sound, and a 30 dB sound is 100 times more intense than a 10 dB sound.
"Furthermore, an increase of about 3 dB is typically perceived by the human ear as a doubling of the sound intensity, while a 10 dB increase is perceived as a doubling of the loudness."
Now we're talkin', though I don't yet know the diff between 'loudness' and 'intensity...'
"To illustrate, a 20 dB sound is 10 times more intense than a 10 dB sound, and a 30 dB sound is 100 times more intense than a 10 dB sound.
"Furthermore, an increase of about 3 dB is typically perceived by the human ear as a doubling of the sound intensity, while a 10 dB increase is perceived as a doubling of the loudness."
Now we're talkin', though I don't yet know the diff between 'loudness' and 'intensity...'
Somebodyelse5
16124-75030
Don't go any deeper. You will notice a difference. Leave it at that. Go order whatever mat and insulation you want and install it, enjoy it, and be happy. drink a beer. think about something else. I'm not going to explain logarithmic scales and Fast Fourier Transforms for you.
- Thread starter
- #10
Somebodyelse5
16124-75030
if only they were that fun!What's that you say--Fast & Furious Transformers? Can't wait!
3db reduction is “half as loud”as SE5 said.
Linear vs Log
Linear vs Log
I did a full carpet out Kilmat install. Put it in the front two doors, floors, rear wheel arches/panels. I went through 2.5 boxes. Came back with new foam, and reinstalled my carpet.
I can definitely tell a difference. When you knock on the rear doors I haven’t done yet they are loud, and hollow. The doors with the kilmat sound solid.
I didn’t take any decimal readings, but it sounds better to me.
I can definitely tell a difference. When you knock on the rear doors I haven’t done yet they are loud, and hollow. The doors with the kilmat sound solid.
I didn’t take any decimal readings, but it sounds better to me.
