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How a network switch affects audio playback – An extreme deep dive!

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How a network switch affects audio playback – An extreme deep dive!
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9 COMMENTS

  1. Hi Jaap, congratulations for bringing objective analysis to our field. It’s very scarce!

    One quick question: I have two SOTM switches, separated by a 20 meter cable run. SOTM folks advise against fiber because of jitter, yet I read that copper is more prone to jitter than fiber. Have you measured connecting through SFP ports va RJ45? Thanks!

  2. Hi Jaap,

    really interesting test!
    What surprises me is that there is no clear correlation between phase noise and jitter – since they are just two sides of the same coin.

    I believe that the Pura the AMMONITE switches perform well because they have better phase noise in the Ethernet signal by using the OXCO clocks. That would at least be a coherent explanation that would also agree with John Swenson’s thesis. Then we would have two things affecting the sound: common mode noise and phase noise.

    Have you found a dependency regarding the frequency range of the common mode noise to worsen the streamer clock – I would be interested. I could not clearly assign this in the measurements.

    Best regards,

    Eric

  3. Hi Jaap,

    really interesting test!
    What surprises me is that there is no clear correlation between phase noise and jitter – since they are just two sides of the same coin.

    I believe that the Pura the AMMONITE switches perform well because they have better phase noise in the Ethernet signal by using the OXCO clocks. That would at least be a coherent explanation that would also agree with John Swenson’s thesis. Then we would have two things affecting the sound: common mode noise and phase noise.

    Have you found a dependency regarding the frequency range of the common mode noise to worsen the streamer clock – I would be interested. I could not clearly assign this in the measurements.

    Best regards,

    Eric

  4. When you compared switches, does noise peaks appeared the same frequency points on each switches and how big was the general noise floor levels on them? It would be nice to see spectrum analyzer screen shots from each switches how then behaved.

  5. When you compared switches, does noise peaks appeared the same frequency points on each switches and how big was the general noise floor levels on them? It would be nice to see spectrum analyzer screen shots from each switches how then behaved.

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