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  • OT: transmission of sound

    From Scott@21:1/5 to All on Thu Jun 26 16:44:27 2025
    Last Saturday there was a Punk All Dayer concert at Bellahouston Park (including inter alia the Sex Pistols). I live about five miles from Bellahouston Park and I could hear music. One of the neighbours said
    it was coming from the concert. Is this possible?

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  • From Liz Tuddenham@21:1/5 to Scott on Thu Jun 26 17:41:24 2025
    Scott <newsgroups@gefion.myzen.co.uk> wrote:

    Last Saturday there was a Punk All Dayer concert at Bellahouston Park (including inter alia the Sex Pistols). I live about five miles from Bellahouston Park and I could hear music. One of the neighbours said
    it was coming from the concert. Is this possible?

    Yes. Sometimes low frequency sound can exhibit strange behaviour.
    Large explosions have been heard at a great distance while people nearer
    the source heard nothing. (Obviously, people very near the explosion
    may not have heard it because their eardrums were blown out.)

    Even the higher frequencies can travel surprisingly long distances. I
    used to supply the P.A. for a dog show in the grounds of Longleat House
    in Wiltshire. The loudspeakers were 11 Vitavox GP1 horns, rated at 20
    watts each, on the top of a 10-metre scaffolding tower. The frequency
    response didn't extend much below 200 c/s but a friend reported hearing
    them in Frome High Street, about 6 km away.

    If the source of the sound is wide, so it launches a plane wave, the
    'inverse square ' law, which describes the fall-off of intensity from a
    point source, doesn't apply. This means there is less diminution with
    distance until the distance becomes so great the the width of the source
    is so small by comparison that it approximates a point source.

    --
    ~ Liz Tuddenham ~
    (Remove the ".invalid"s and add ".co.uk" to reply)
    www.poppyrecords.co.uk

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  • From NY@21:1/5 to Liz Tuddenham on Thu Jun 26 19:19:33 2025
    On 26/06/2025 17:41, Liz Tuddenham wrote:
    Scott <newsgroups@gefion.myzen.co.uk> wrote:

    Last Saturday there was a Punk All Dayer concert at Bellahouston Park
    (including inter alia the Sex Pistols). I live about five miles from
    Bellahouston Park and I could hear music. One of the neighbours said
    it was coming from the concert. Is this possible?

    Yes. Sometimes low frequency sound can exhibit strange behaviour.
    Large explosions have been heard at a great distance while people nearer
    the source heard nothing. (Obviously, people very near the explosion
    may not have heard it because their eardrums were blown out.)

    Even the higher frequencies can travel surprisingly long distances. I
    used to supply the P.A. for a dog show in the grounds of Longleat House
    in Wiltshire. The loudspeakers were 11 Vitavox GP1 horns, rated at 20
    watts each, on the top of a 10-metre scaffolding tower. The frequency response didn't extend much below 200 c/s but a friend reported hearing
    them in Frome High Street, about 6 km away.

    If the source of the sound is wide, so it launches a plane wave, the
    'inverse square ' law, which describes the fall-off of intensity from a
    point source, doesn't apply. This means there is less diminution with distance until the distance becomes so great the the width of the source
    is so small by comparison that it approximates a point source.


    We used to live about 2 miles from Castle Howard. Every year they had a
    live pop concert in their grounds. With our windows open we got a free
    concert that was recognisable music even if some of the higher
    frequencies needed to discern lyrics were attenuated. One year we were
    treated to Meatloaf in concert! I read that someone in charge was rather
    peeved that people who hadn't paid to enter the grounds got to hear (if
    not see) the performers in concert. Tough titty!

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  • From JMB99@21:1/5 to Liz Tuddenham on Thu Jun 26 19:37:01 2025
    On 26/06/2025 17:41, Liz Tuddenham wrote:
    Yes. Sometimes low frequency sound can exhibit strange behaviour.
    Large explosions have been heard at a great distance while people nearer
    the source heard nothing. (Obviously, people very near the explosion
    may not have heard it because their eardrums were blown out.)


    There are places known where it is possible to talk to people over quite
    long distances.

    When I was at university we did a Rag Stunt at Harlech Castle. The
    castle is on a rocky outcrop well above the plain. We found we could
    talk to people on the plain below from the top of the castle walls, in a
    normal voice.

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  • From J. P. Gilliver@21:1/5 to All on Thu Jun 26 19:59:58 2025
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