MDF Spacer Rings & Dynamat OPINIONS ??

[Fbodytrinity]

Re: MDF Spacer Rings & Dynamat OPINIONS ??

well good thing you pointed that out. We wouldnt want anybody to explain how dynamat works incorrectly on the internet

[T-Mill]

Re: MDF Spacer Rings & Dynamat OPINIONS ??

i'm headed off to ny for a week... i'll post some pics of what im trying to explain once i get back... the better u know how something works the better u can make decisions on how to use it... especially something as potentially expensive as dynamat or similar

[96firebird311]

Re: MDF Spacer Rings & Dynamat OPINIONS ??

Dude, chill. Keep it on a debate level, not an argument. I'm honestly curious about it and I'm not an idiot so please don't patronize.

My apologies, but I'm kinda a heated debater. Never once have I ever thought anyone posting on this board was an idiot. Rest assured this will always be a discussion forum.:)

well good thing you pointed that out. We wouldnt want anybody to explain how dynamat works incorrectly on the internet

hahaha I thought the same thing when I saw all these posts on a forum that gets 1 post a week. LOL But I contributed to it too.:banana:

I'll post up a response shortly. I'm headed out of town for a bit and my ride will be here any second.:)

[T-Mill]

Re: MDF Spacer Rings & Dynamat OPINIONS ??

Back from NY, so as promised lol...

When a subwoofer hits, its frequency is low and intense. When the vibations reach the panels it causes them to vibrate, but instead of just transferring the vibrations through the metal, it will, in some cases, cause the panel to vibrate at its own frequency causing it to produce its own sound. This is why no matter what the tone of the note released from the woofer, the vibrating panels will always be the same tone.

This is how dynamat prevents this:


The red arrows indicate where the dynamat pushes or pulls the metal. the dynamat acts kinda like a shock absorber does... it wants to hold its shape, so when the metal pulls away it pulls it back, and when it pushes into it, it pushes back. This prevents the metal from vibrating.



Road noise is a bunch of random frequencies of vibrations caused by various things... tires moving on the road, air moving past the car, other cars etc... These vibrations cause the metal to vibrate and transfer the noise to the inside of the car.

Air vibrates outside of the car... air outside causes metal to vibrate... metal causes air inside to vibrate, creating the noise heard inside the car

This is how dynamat prevents this:


Just like with the vibrations caused by a woofer, dynamat does resist movement of the metal, but because the vibrations have a higher frequency and more random order, the dynamat isn't able to maintain its shape as well and the metal is more susceptible to these vibrations... but as the picture shows, even though the metal is vibrating, the dynamat absorbs these vibrations and doesn't transfer them to the inside of the car, instead they are dispersed and absorbed by the dynamat.

Flexibility, density, shape and location have alot more to do with its effectiveness than its weight... you could argue that the greater the mass, the better the sound deadening ability, but that still doesn't mean that more weight is the solution... Just because a material is heavy doesn't necessarily mean that it will have more sound deadening ability than a lighter weight material...

[T-Mill]

Re: MDF Spacer Rings & Dynamat OPINIONS ??

the black is the metal, the gray is the dynamat