• RE: Different DAC chip in the Dac 2.1 to Run I2s? - jmlpartners 19:12:29 02/27/09 (3)
  In Reply to: RE: Different DAC chip in the Dac 2.1 to Run I2s? posted by Lizard_King on February 27, 2009 at 15:32:41

  USB to I2S is superior sounding and has lower jitter.
  
  As to sounding superior, that's a matter of opinion: I doubt anyone making such a claim has used an AD1865 for evaluation. As to lower jitter, that depends on which clock you measure. Most S/PDIF jitter measurements look at MCLK jitter because most modern DACs update their output on a particular BCLK edge and BCLK is derived from MCLK. MCLK is very susceptible to data-correlated jitter, especially in older DIRs, such as the CS8412/14. On the other hand, the AD1865 updates its output on an edge of WCLK and is mostly immune from data-correlated jitter. Going from USB=> S/PDIF=> AD1865 will have about the same amount of sample clock jitter as USB=> I2S=> AD1865.
  
  The AN1865N DAC can not have a Is2 input.
  
  Duh. That’s why I suggested modifying a USB=> I2S board to output the kind of signal the AD1865 wants to see. That’s what you should do if you are convinced eliminating S/PDIF from the USB input chain will improve things. But before you do that, I suggest you read the USB-Audio spec regarding jitter and decide if anything you do downstream will really help.
  
  
  

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  • RE: Different DAC chip in the Dac 2.1 to Run I2s? - Lizard_King 03:04:33 03/04/09 (2)
    In Reply to: RE: Different DAC chip in the Dac 2.1 to Run I2s? posted by jmlpartners on February 27, 2009 at 19:12:29

    are you sure about this?
    
    

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    • Of course. - jmlpartners 05:20:56 03/04/09 (1)
      In Reply to: RE: Different DAC chip in the Dac 2.1 to Run I2s? posted by Lizard_King on March 04, 2009 at 03:04:33

      Why do you doubt it?
      
      

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      • RE: Of course. - Lizard_King 14:42:20 03/10/09 (0)
        In Reply to: RE: Of course. posted by jmlpartners on March 04, 2009 at 05:20:56

        I checked with an expert who designs and builds serious gear including USB dacs. I am told it can work yet it will not be optimal.
        
        I will want to switch out the Dac board in favor of a more current DAC chip. SPDIF Receiver and USB board so I can run USB > > > I2S.
        
        

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