06' Sound reduction results

[ccarbon]

Here are the results of Dynamating my 2006 Quad cab CTD 4wd.

I used a Radioshack electronic readout DB meter on both the A and C range. I purchased the meter after I started the project so my stock truck numbers are based on a 06' Std. cab 4wd CTD. The testing was all done on the same day on the same roads. I do have new snow tires w/o studs on my truck where the stock test truck had factory michelins and an additional 50,000 miles.

70 MPH Stock 73 /a 88/b
Mine 69 /a 83/b
2005 Chevy Avalanche 71 /a 86/b

70 MPH Full throttle Stock 75/a 87/b
Mine 72/a 85/b
Chevy 76/a 87/b

Idle 0 mph Stock 60/a 80/b
mine 53/a 68/b
Chevy 51/a 72/b

Right side 3' from
fender. Stock 72 78
mine 73 78
Chevy 57 62

According to the experts, 3db is the first noticeable difference a human can make and 10 db is perceived as twice as quiet. I found the same. The 4db drop is noticeable, even by my wife. You still here the engine sounds but it's easier to talk at highway speeds.

I used Dynamat extreme and covered all the areas I read about on this forum site. Thank you guy's.. I did the doors, rear panel, headliner and under most of the floor. I didn't go under the rear seat. The hood has several pieces of Dynamat and their foam pad installed under the factory insulation. Surprisingly the hood insulation didn't help the noise outside the truck. I do have a ATP kit on order and will post results with it.

Overall it the soundproofing was worth the effort.

Thanks