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  1. www.diymobileaudio.com › threads › partsexpressPartsExpress Sonic Barrier 1-1/4" 3-Layer Acoustic Sound ...

    1 day ago · The more consistent pore size narrows the effective range of targeted frequencies for sound absorption, so I would expect the SB to be less effective at absorbing lower frequencies than GU. The 1-1/4" SB foam is approximately 1/8" thinner than GU.

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