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<blockquote data-quote="FoxPro5" data-source="post: 5220325" data-attributes="member: 562649">Interesting how the visual memory works, but I swear that&#039;s a picture of cam2xrunner&#039;s truck from back in the day. //content.invisioncic.com/y282845/emoticons/redface.gif.62fdbfe1a101588a808c4cff71bcb942.gifIf you take an empty 5 gallon pail and yell into it, it&#039;s probably going to sound different if you put a Deflex pad in the bottom of it. All you have to do to hear when it becomes less and less effective is lower your voice. Crude experiment, but some people need to do this because all the science in the world will not convince them.Same thing for closed cell foam. I can see it &quot;softening&quot; and otherwise hard surface, but to say that it&#039;s absorbing sound is a big stretch. Open cell foam can and does absorb sound waves because it&#039;s porous. But, absorption is velocity dependent and OCF that close to the the back of a driver isn&#039;t going to much of anything because the wave really hasn&#039;t gained much oomph. I&#039;ve never liked the sound of any driver with OCF behind it. And, if a guy like John Krutke (Zaph Audio) who analyzes speakers and build enclosures says OCF is whack, I think that says a lot.</blockquote>

[QUOTE="FoxPro5, post: 5220325, member: 562649"] Interesting how the visual memory works, but I swear that's a picture of cam2xrunner's truck from back in the day. [IMG]//content.invisioncic.com/y282845/emoticons/redface.gif.62fdbfe1a101588a808c4cff71bcb942.gif[/IMG] If you take an empty 5 gallon pail and yell into it, it's probably going to sound different if you put a Deflex pad in the bottom of it. All you have to do to hear when it becomes less and less effective is lower your voice. Crude experiment, but some people need to do this because all the science in the world will not convince them. Same thing for closed cell foam. I can see it "softening" and otherwise hard surface, but to say that it's absorbing sound is a big stretch. Open cell foam can and does absorb sound waves because it's porous. But, absorption is velocity dependent and OCF that close to the the back of a driver isn't going to much of anything because the wave really hasn't gained much oomph. I've never liked the sound of any driver with OCF behind it. And, if a guy like John Krutke (Zaph Audio) who analyzes speakers and build enclosures says OCF is whack, I think that says a lot. [/QUOTE]

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