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external clock necessary?

Discussion in 'Digital Audio' started by liquisound, Dec 28, 2005.

  1. liquisound


    Sep 24, 2005
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    should you use an external clock to connect a digital mixer to a computer?

    yamaha aw4416 mixer ---> adat lightpipe ----> RME hammerfall PCI soundcard ----> PC.

    (the yamaha and the RME both have BNC word clock connectors by the way)
  2. jahtao

    jahtao Guest

    If the two devices are locked to one another it will sound okay, you ont get clicks and pops. Probably your state of affairs now. I have a friend who always seems to advocate clocks, he does this thing with his hands (the universal sign for 'massive'?) and makes this big exploding kinda noise when he talks abot them. It comes down to jitter. For me it would be somewhat of a luxury. It comes down to money... ~$2000
  3. ghellquist


    May 14, 2004
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    Stockholm, Sweden
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    No need for separate clock. The ADAT signal contains clock signal and the RME is well stuffed to sync to that.

    There is a discussion that ADAT may not be the very best clock signal. But in your case it is not and issue as once the signal has been converted to digital it stays the way it is.

  4. Randyman...


    Jun 1, 2003
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    Houston, TX
    Also, keep your Yamaha as the Wordclock Master (use the Yamaha's Internal Clock), and slave the RME to "ADAT 1" (or Wordclock if you want to run a BNC). This will give the Yamaha's AD converters the cleanest clock source (opposed to syncing to the RME's clock through ADAT).

    I always try and make my "Go-To" AD converter act as my System Master, and then feed BNC WordClock to the rest of my gear. The Internal Clock on a good AD will be VERY VERY VERY hard to beat with ANY external clock (the PL circuit itself adds JITTER, so eliminating a PLL by using a AD's internal clock usualy results in the lowest Jitter possible - although Clock Manufacturers will try to convince you otherwise ;) ).

    Even IF an exteral clock has insanely low Jitter, by the time it reaches the AD's WC input, the PLL has indeed ADDED JITTER!!! You can clearly see this spec in most AD's spec sheets (Jitter will spec lower on the Internal Clock opposed to syncing via PLL).

    Spec's don't lie - but your ears sure can fool you!

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