Questions about blocking 110 Hz in a car via Green Glue
My car, a newish Corvette, has a steady drone noise of about 110 Hz. A major noise contributor is the 4' x 4' floor under the hatchback. I want to install a noise suppression layer between the carpet and the hard layer (maybe it is fiberglass) below.
Most auto noise suppression is a soft butyl or vinyl layer with a thin aluminum top layer. Most of them are only about .08" thick. The soft layer is adhesive. It seems there is a lot of BS in auto acoustics, little data, and some placebo affect. Also, I think most aftermarket auto noise suppression assumes a need for full frequency noise suppression even though low frequency noise is more prevalent. On a more positive note, most people are happy enough with the results of using the common auto films but I believe there is room for improvement.
Last year I considered building a quiet box for a generator and for that project I read about sound blocking using Green Glue and drywall. It makes perfect sense to me. For the flat trunk surface in my car I think green glue and a thin layer of Hardboard or MDF would be much more effective because Green Glue and air would be a much better sound blocker and MDF would have much more mass than the auto films like Dynamat for example.
I posted this here because I wanted to get away from knee jerk responses from auto forums and people here are more familar with the green glue method.
Thanks for listening! I appreciate any comments.
PS: I realize I will need to apply noise suppression elsewhere in the car but first I want to tackle the main culprit.
Last edited by dugt; 08-25-2019 at 04:13 PM.