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Old 07-07-2013, 08:21 AM   #1
Bradrcr
Scooby Specialist
 
Member#: 276382
Join Date: Mar 2011
Chapter/Region: NWIC
Location: Seattle, Wa
Vehicle:
2005 SaaBeeru
OBP

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I finished my 9-2x sound barrier/deadening project recently and wanted to post my results here. My goals were primarily road noise reduction, with some reduction in exhaust noise (I have a catted DP with resonated mid pipe and muffler delete). This is my first serious sound deadening project so to start I combed through multiple Nasioc threads as well as took many ideas from sounddeadenershowdown.com. I essentially took the results that everyone took as universally positive on a wagon and targeted those. The biggest difference in my process was taking both decibel and sound level readings with each step. While I do feel that one's personal perception of sound improvement is most important, it's obviously very subjective and I wanted to identify those parts which have the most significant effect. I won't post all my readings here, but I did post them all in my build thread: http://forums.nasioc.com/forums/show....php?t=2400966
For my deadener, I used Dynamat, and for my barrier layers I used Mass Loaded Vinyl secured to Neoprene Y20 closed cell foam with 3M 80 spray adhesive for vinyl and rubber. All these steps combined added 50-60lbs to my wagon and cost about $150. Labor time is 10-14 hours depending on skill, not counting a lot of time waiting for glue to dry.

Wagon area: Vent blocking- the best single sound reducer, gave me almost 40% of my overall result:

Shock towers- moderate reduction in overall volume, and the hardest part to line, but helpful in reducing rear wheel noise and completing overall coverage:

Wagon floor and rear hatch- good results and very easy install, these areas require deadening as well as barriers. Will produce a 'dead zone' of sound behind the driver, significantly lover idle and cruising volume contribution from exhaust:
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Old 07-07-2013, 08:22 AM   #2
Bradrcr
Scooby Specialist
 
Member#: 276382
Join Date: Mar 2011
Chapter/Region: NWIC
Location: Seattle, Wa
Vehicle:
2005 SaaBeeru
OBP

Default

Cabin area:
Doors- Need Dynamat on the outer skin as well, at least 25% coverage. Eliminate both tire and exhaust noise, will increase low-end speaker response:



Rear seat- My barrier is made from my leftover scrap, but still works. Little effect on cruising volume, but helps well with idle volume levels and eliminates some rear tire noise:


Floormats- Best bang for the effort after the rear vents, can be laid down without even gluing if cut well enough, good reduction in both idle and cruising volume:



My sound tests were take with an iPhone 4s laying on the passenger seat (leather). Sound levels were taken with iAnalyzer Lite and Db levels were initially measured with the Decibel 10th app and later changed to the Decibel App.

Pre-install cruising levels:



Cruising levels after install:

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Old 07-07-2013, 11:10 AM   #3
LatentWagen
Scooby Guru
 
Member#: 50315
Join Date: Dec 2003
Chapter/Region: Tri-State
Location: New York
Vehicle:
0508 Saabaru & specB
Stage: Maintenance

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Nice write up! 60lbs isn't terrible... probably a much comfier car now
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