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Message: <blockquote data-quote="FoxPro5" data-source="post: 4117961" data-attributes="member: 562649">They don't. Deflex (product of Cascade Audio Engineering, not the generic term) pads defract and scatter sound waves through the the series of concentric rings on the surface, thus reducing the amount of back wave cancellation. They are made from a low derometer rubber with isn't very good at sound wave absorption, but great for that particular application. They work best when installed directly behind the driver at 15* off axis from the radiating wave.Closed-cell foam is an absorber and it's job depends directly on its thickness and the frequency in question. So, for your typical midrange driver playing from 50hz - 3khz a piece of 1" CC foam would get you down to about 1k at 100% absorption and then fractionally less as the wavelengths get longer.</blockquote>

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