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Message: <blockquote data-quote="SmartAsss" data-source="post: 7216641" data-attributes="member: 629857">I know for a fact that a pillow compresses, I sleep on one every night. a plastic bottle does too..Since that happens, then it is taking energy away from the back wave, thus slowing the wave down.. making the box appear larger.we are trying to make the back pressure more intense so we need something that does not take energy away from the sound wave. something that does not compress at all.a pillow case is physically nothing to a sound wave, simple test would be to hold the case in front of the a speaker and listen, if you can still hear the sound then sound waves are penetrating it.I cannot explain this anymore clearly, is it sinking in yet? Sorry op for polluting this post.</blockquote>

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