Hey everyone I'm doing some investigation into how sound proofing actually works, and i'm more or less stuck. I've found two terms(http://www.soundproofing101.com) which are used to decribe what happens when you sound proof. they are: noise reduction and noise absorbtion "Noise reduction noise reduction is achieved by stopping it, kilin it, not letting the noise get through the wall or window. Noise Absorbtion Noise absorbation is achieved by chagnng the characteristics of the noise. Stop it from echoing. What works for noise absorbtion does not ever work for noise reduction" 'wikipedia' also says something similar. http://en.wikipedia.org/wiki/Sound_proofing wikipedia is written by ordinary people like you and me so maybe the person read the same resoucres i have. does anyone else have any more indepth explanation? any links or places i should chek out? perhaps anyone can try to explain what it means to 'change the acoustical propreties of sound'? thanks for you attention so far, any response or help will be Greatly Appreciated!