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<blockquote data-quote="Ivan Beaver" data-source="post: 112890" data-attributes="member: 30">Re: Acoustic FoamAs with most things-there is not a simple answer.Yes thickness matters-especially on the low freq side of things.&nbsp; But you also need total area and non flat surfaces (that can be reflective at high freq).In terms of foam V shapes have better absorption than pyramid shapes.&nbsp; Yes as a general rule the greater the total coverage the lower the RT60 at any freq.If you go with thicker foam (and less of it) then you will have more reflections at the higher freq.&nbsp; However at lower freq you could space the panels apart with very little loss in effectiveness.&nbsp; In other words you need different approaches for low and high freq.-or what works for one does not apply to the other.There are a couple of factors that can cause a panel to have a rating greater than 1.&nbsp; It all comes down to the tests and how they are doing.&nbsp; When doing the test the panel is assumed to have a surface area equal to the square area of the face of the panel.&nbsp; But when a single panel is put into a test chamber there is more &quot;area&quot; exposed than the simple measurements would imply.&nbsp; This is called &quot;edge effect&quot; and the edges of the panel will provide extra &quot;area&quot; to the reflections in the test chamber.It is not actually absorbing &quot;more than everything&quot;, just the way the tests reflect &quot;the numbers&quot;.</blockquote>

[QUOTE="Ivan Beaver, post: 112890, member: 30"] Re: Acoustic Foam As with most things-there is not a simple answer. Yes thickness matters-especially on the low freq side of things. But you also need total area and non flat surfaces (that can be reflective at high freq). In terms of foam V shapes have better absorption than pyramid shapes. Yes as a general rule the greater the total coverage the lower the RT60 at any freq. If you go with thicker foam (and less of it) then you will have more reflections at the higher freq. However at lower freq you could space the panels apart with very little loss in effectiveness. In other words you need different approaches for low and high freq.-or what works for one does not apply to the other. There are a couple of factors that can cause a panel to have a rating greater than 1. It all comes down to the tests and how they are doing. When doing the test the panel is assumed to have a surface area equal to the square area of the face of the panel. But when a single panel is put into a test chamber there is more "area" exposed than the simple measurements would imply. This is called "edge effect" and the edges of the panel will provide extra "area" to the reflections in the test chamber. It is not actually absorbing "more than everything", just the way the tests reflect "the numbers". [/QUOTE]

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