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#282082 - 2019-01-23 12:24 Source First?
Registered: 2012-04-17
Posts: 2,272
3dit0r Offline
Senior Shouting Officer
3dit0r Offline
Senior Shouting Officer

Registered: 2012-04-17
Posts: 2,272
Loc: South UK
Do the Stereophile jitter rejection tests of the Nucleus+ imply that even when streaming it's 'source first'? I.e. that jitter created at source survives metres of ethernet cable and switches, etc.? Or lack of jitter at source also means less jitter in the endpoint, metres of ethernet cabling and switches notwithstanding?

Or have I misinterpreted the results?


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#282086 - 2019-01-23 13:34 Re: Source First? [Re: 3dit0r]
Registered: 2004-04-15
Posts: 12,584
VirusKiller Offline
Don't Panic
VirusKiller Offline
Don't Panic

Registered: 2004-04-15
Posts: 12,584
Loc: nr. Milton Keynes, UK
Quote:
Paul Miller reported finding differences in both the absolute levels of jitter and the spectra of the jitter with some USB-connected DACs
USB connected endpoints. Measurements won't apply to network endpoints.


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#282088 - 2019-01-23 14:37 Re: Source First? [Re: VirusKiller]
Registered: 2012-04-17
Posts: 2,272
3dit0r Offline
Senior Shouting Officer
3dit0r Offline
Senior Shouting Officer

Registered: 2012-04-17
Posts: 2,272
Loc: South UK
Quote:
the smaller amount of spectral broadening that I'd found with the Ayre QX-5 when fed USB data from the MacBook Pro (fig.1), but not with AES/EBU or Ethernet data (footnote 2)"
Would imply so, but the relevant section in footnote 2 reads:

Quote:
This graph was taken with AES/EBU data; with Ethernet and USB data, neither of which should be prone to jitter interference, the picture was identical except for a slight broadening at the base of the spectral spike that represents the high-level tone at one-quarter the sample rate with USB data (fig.13). This broadening... will be due to very low-frequency random jitter...
Implying that ethernet behaviour was the same as USB in this respect. That being the case, in the Nucleus+ measurements, the reduction of jitter over USB when the Ayre was fed by the Nucleus+ rather than the MacBook Pro would see a similar reduction in jitter over ethernet and would imply that the Nucleus+ is a lower jitter source than the MBP regardless of interface.

It's ambiguous though, because of the discrepancy between the two articles. Or maybe I'm still missing something!


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