Thoughts on using carpet rolls for room treatment

Discussion in 'Pro Audio' started by dnafe, Apr 23, 2006.

  1. dnafe

    dnafe Guest

    dnafe, Apr 23, 2006
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  2. dnafe

    MD Guest

    Wouldn't carpet roils (maybe 6' tall and at least 12"" in diameter) when
    placed in the corners of a room work as well as other systems in
    providing broadband absorption below 300hz?
    MD, Apr 24, 2006
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  3. dnafe

    Chris Whealy Guest

    The tufted surface of the carpet will absorb quite a bit of sound over
    (roughly) the 2KHz mark, but below that I suspect you will not get the
    kind of performance you are hoping for. The backing layer of carpet can
    be quite dense, or if its cheap foam backed carpet, then impermeable to air.

    This is the key factor when designing any form of porous absorber. You
    want the porous layer to be sufficiently open to allow air through, but
    also sufficiently tortuous to absorb the sound energy by conversion to
    heat at the air/fibre boundary layer.

    To be honest, the best way to go is to measure the RT60 of the empty
    room at the 8 standard octaves (64Hz, 125Hz, 250Hz, 500Hz, 1KHz, 2KHz,
    4Khz and 8KHz). Then put in your carpet rolls and measure the RT60
    again, paying particular attention to the times for frequencies below 500Hz.

    Chris W
    Chris Whealy, Apr 24, 2006
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