I've read this forum for about 3 hours now. I have learned alot and think I have the basics down:
Dampening is adding mass to the structure. This keeps sound from transmitting through the structure.
Absorbtion is something that soaks up the sound wave.
Now for my problem. I'm converting a Bus (coach, not a school bus). I have noise coming from everywhere. The wheels are loud..... road noise. The engine is right below the back lounge which has the big TV and 6.1 sound system. The problem is you can't hear it that well.
From what I have gathered, I think I am in need of both Dampening and absorbtion. I'll try my best to describe the look of the back of this bus (don't have a picture). If you can imagine a bench, that is what the back looks like. Right in front of the bench is a wall that is framed and ready to go as soon as I get the noise stopped.
So I have a space of 30" between the wall and the back of the "bench", the bench itself, and the wall to work with to kill the noise.....
What combinations to use and where to use them is the question?????