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This PDF document is claiming the following:

Wool carpets may have some advantages over nylon carpets in this respect, particularly for low frequency noise, as is demonstrated in Figure 1. enter image description here

Is this indeed true? Will 2 carpets that differ only in material (wool vs synthetic fibre) have significant different acoustic properties?

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    Your question asks if there is is a "significant" difference, yet the graph seems to show a moderate difference. What would constitute a "significant" difference in your mind? – Flimzy Jul 30 '14 at 17:32
  • @Flimzy potato…po ta to(e). Any difference at all would be "significant". – HasH_BrowN Oct 25 '14 at 2:09
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    @HasH_BrowN: If that's true for the OP, he can state as such. To anyone who studies acoustics, that's absolutely not true. – Flimzy Oct 25 '14 at 12:15
  • Well the nylon is around 90% and the wool is around 96%, so yes that is significant. The fact that graph doesn't show is what type of pile of carpet is being compared, which will make a very significant difference in sound absorption. At work now, so I will add reference later. – HasH_BrowN Oct 25 '14 at 15:50
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    "significant" in my opinion would simply be "if I can hear it". – BaGi Oct 28 '14 at 6:55

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