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Do all CD/DVD players sound the same using the digital output?

Discussion in 'Blu-ray & DVD Players & Recorders' started by cybersoga, Jan 14, 2003.

  1. cybersoga

    cybersoga
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    How can different CD players/DVD players sound different if the SPDIF digital output is used to connect it to the amp (with audio CD's)? surely they all output the same Linear PCM bitstream?
    Won't it only make a difference if you are using the anologue outputs (and therefore the DAC in the DVD/CD player)?
    Same question for DVDs.
     
  2. hornydragon

    hornydragon
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    I assume you are correct. there may be a slight difference between Coax and Optical but i dont think you should be able to tell the difference.
     
  3. StooMonster

    StooMonster
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    Why optical vs coax different?
    Optical adds additional steps to the process. i.e. a coax to optical in source, and then optical back to coax in receiver. Also on some players optical output is muted to 48kHz rather than 96kHz due to manufactured quality of jacks.

    Bitstream
    Your key assumption is that bitstreams are lossless, I don't know if this is the case. I think the players will vary in the creation of these bitstreams, due to all sorts of factors.

    StooMonster
     
  4. mjn

    mjn
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    one word, "jitter", look for a post by Nic Rhodes, has loads of info.
     
  5. rhoamish

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    I've recently updated from a Samsung DVD-811 to a Sony DVP-NS900V. Both have used the coaxial output to my Aego P5.

    I only upgraded to avoid some problems the Samsung had playing certain discs. However, there's also a rather noticeable improvement in the sound from the Sony player: it's far crisper, more detailed and more enjoyable.

    I wasn't expecting any change in sound using the coax digital out, but the improvement is definitely a noticeable bonus!

    I've no idea why, but it definitely exists.
     
  6. daninthemix

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    There have been past threads on this where people have shouted themselves hoarse trying to explain the reasons why transports (inc. DVD) sound different.

    Yes jitter, and physical stability of the drive mechanism determines what ratio of 'Original data:error correction approximations' you are hearing.
     
  7. sounddog

    sounddog
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    Theoretically ... yes they all sound the same.

    In practice ... some people (me included) think some DVD players sound better than others though their SPDIF output.

    Victoria
     
  8. Nic Rhodes

    Nic Rhodes
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    All the answers are on the site, as suggested search for stuff on 50p coax!

    but the best digital connections are optical, ST (AT & T).

    SPDIF limited to 48KHz is either a manufacturers decision on the player (physical hardware) or a DVD disc can force no 96 output.

    Bitstream are a packeted system from a lossy system but are reasobnably resistant to jitter, PCM less so
     

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