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Thread: Reducing low end output.

  1. #21
    Join Date: Aug 2009

    Location: Staffordshire, England

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    I'm Martin.

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    Quote Originally Posted by Pharos View Post
    "When the bass energy from the driver units reaches the room boundaries, then a proportion of that energy is absorbed by that surface. This is turn is transmitted outside of the room. The walls effectively become "sound panels""

    That is entirely consistent with my thinking that the sound is transmitted via the substrate rather than through air to another flat.
    Sound vibrates the molecules in the wall the same as it des the molecules in the air - is my understanding anyway. So airborne and structure borne transmission are essentially the same thing.
    Martin



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  2. #22
    Join Date: May 2009

    Location: Bristol

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    This is why we continue to dither about 'downsizing' from a house to a flat. We have good thick walls, and relatively quiet neighbours, and remember back when we lived in a flat. The woman above us seemed to be permanently hoovering, whilst the woman in the flat next to us played opera very loudly all day and well into the night. She was a bit crazy, and had barricaded the way to her door with bins and cardboard boxes to hinder people from complaining to her about the noise. And we lived on the ground floor. Imagine having noisy neighbours above and below you!

  3. #23
    Join Date: May 2016

    Location: Notts

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    I'm Geoff.

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    Quote Originally Posted by Macca View Post
    Sound vibrates the molecules in the wall the same as it des the molecules in the air - is my understanding anyway. So airborne and structure borne transmission are essentially the same thing.
    Of course. but the difference in audio terms is that we want the acoustic energy to pass to our ears through the air, but don't really want that energy to subsequently escape from our listening room through the materials that form the room boundaries!

  4. #24
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 56,679
    I'm Grant.

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    Quote Originally Posted by Joe View Post
    This is why we continue to dither about 'downsizing' from a house to a flat. We have good thick walls, and relatively quiet neighbours, and remember back when we lived in a flat. The woman above us seemed to be permanently hoovering, whilst the woman in the flat next to us played opera very loudly all day and well into the night. She was a bit crazy, and had barricaded the way to her door with bins and cardboard boxes to hinder people from complaining to her about the noise. And we lived on the ground floor. Imagine having noisy neighbours above and below you!
    i got offered a modern flat down rd from me by the housing association as i am disabled.. I said over my cold, dead body couldnt stand having so many folk around me. Ive only one neighbour with a connection to house. am an end terrace with driveway and big garden, plus good neighbours bar the connecting one.
    Regards,
    Grant .... ؠ

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  5. #25
    Join Date: Apr 2013

    Location: Barry, South Wales, UK

    Posts: 983
    I'm Rich.

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    Well, I put a fairly bass heavy tune on and had the music at a level slightly louder than I would normally, which was high 60s dB (thank you for the tip Adrian). I popped downstairs to speak to the neighbour below me, he said he couldn't hear a thing and never has, result! I asked if he could hear the bass thump and he said not at all. He did comment on how considerate it was of me to ask, I'm glad I did as it's more enjoyable to listen to music without worry.

    All's well that ends well.

    Thanks to all for your input, it was much appreciated

    Rich.

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  6. #26
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 25,663
    I'm Martin.

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    Good news.
    Martin



    Current Lash Up:

    Technics SLP1200 CD Player * Nelson Pass DCB1 Pre amp / Krell KSA50S Power amp * JM Lab Electra 926 loudspeakers *


    'You fool! To think that your ape-brain could contain the full knowledge of the Krell!'

  7. #27
    Join Date: Nov 2011

    Location: Seaton, Devon, UK

    Posts: 1,849
    I'm Adrian.

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    Quote Originally Posted by stairpost View Post
    Well, I put a fairly bass heavy tune on and had the music at a level slightly louder than I would normally, which was high 60s dB (thank you for the tip Adrian). I popped downstairs to speak to the neighbour below me, he said he couldn't hear a thing and never has, result! I asked if he could hear the bass thump and he said not at all. He did comment on how considerate it was of me to ask, I'm glad I did as it's more enjoyable to listen to music without worry.

    All's well that ends well.

    Thanks to all for your input, it was much appreciated

    Rich.
    Great to hear , 60-70dB is normal, human speech normally peaks around 75dB, So if you set it to peak at 75dB you will be fine. Pleased to hear it has worked out.
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  8. #28
    Join Date: Nov 2014

    Location: Caterham,Surrey

    Posts: 49
    I'm Stewart.

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    Yes,great result! It's good to be considerate of your neighbours.
    I have no problem with mine.They even throw bricks through my windows so they can hear it better!


  9. #29
    Join Date: Oct 2014

    Location: Surrey

    Posts: 169
    I'm Graham.

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    I found first generation air inflated Townshend
    audio seismic sinks to be excellent at decoupling speakers from floor. I used them on wooden floors.
    When spiked to floors, the bass would rattle the floors and I could feel it in my feet. Using sinks, all the vibration was absorbed and nothing transmitted to floors. Appreciate concrete is different to timber so effect may be different.
    Graham

  10. #30
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 905
    I'm Dennis.

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    "Sound vibrates the molecules in the wall the same as it des the molecules in the air - is my understanding anyway. So airborne and structure borne transmission are essentially the same thing. "

    Yes Martin, but we are discussing which route the leakage may be through, and the curative treatment is appropriate to that route.

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