Popular Post marce Posted October 13, 2018 Popular Post Share Posted October 13, 2018 2 hours ago, barrows said: The problem with an external clock like this is two fold: First you have to carry the clock signal on a wire, with at least two connections, and then some internal connection inside the component are virtually unavoidable as well. So you get clock degradation there. Then, you have the wrong frequency for an audio DAC, so the DAC then internally has to convert that 10 MHz frequency to one of the audio frequencies (like 22.5792, for example). This is generally done using a DDS chip, this also adds more phase noise, so by the time your clock signal gets to the DAC ir has been degraded quite a bit. It is much better to put a really good clock in the DAC, right at the DAC chip, at the correct frequency. External reference clocks like the Mutec are designed for recording studio use where often multiple components need to be clocked together to a single reference, in a home audio playback system we do not have multiple components to clock together (OK there are some rare exceptions to this), so it is better to not use an external clock. But do not take my word for this, ask @marce, or at @JohnSwenson. I agree totally, been talking about this where I am currently working in sunny Pulborough during the week, doing 35kV+ PSU's. The whole point of a master system clock is to avoid clocks being slightly out of sink where you have multiple clocks (as in a studio etc.) this can cause numerous problems, like having numerous hearts all beating slightly differently, inter-modulation, extra beats etc. even worse when you have a multiple phase array GHz microwave, so in those situations on clock to rule them all, because there are multiple clocks of the same frequency. Where clocks have multiple frequencies as seen in domestic audio, local clocks next to the device are best, each clock can then be optimised for its requirements. I dont like external clocks or clock add ons, the extra cable and signal distance adds more problems than it solves. asdf1000 and barrows 2 Link to comment
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