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It seems that sound deadening it all about variety.
When something like dynomat blocks some vibration, and certain frequencies, when used with other materials you get a better blocking effect.
So, Rubber, ceramic spray on, wool, all combined does the best job.
If you go look at the materials used in modern S class Mercedes, you will see all three.
The super luxury use something like Lizard Skin (a spray on ceramic undercoating with little ceramic balls to help reduce certain frequencies)
then rubber, dynomat etc
Then wool backed glued to either more rubber or carpet underlayment...depends on the car.
The cheaper way is rubber roofing from Home Depot, the self stick stuff.
Rich
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