How can I tell if I need a better clock for my DAC?


I was interested in the responses to a related post by leemaze this week, saying that a Synchro Mesh was a good way to improve a DAC with subpar jitter.  I have a Cambridge CXU, with an inboard DAC; how could I determine how much jitter it has? 
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Thanks, everyone, for your inputs.  Unfortunately, much of what was said went over my head.  Could someone recommend a good, readable reference on dacs?

Here's an article that touches om the subject even though ge talks more about usb inputs. He also has a list of components he recomends, including dacs.
https://darko.audio/2013/07/when-should-you-use-an-external-usb-spdif-converter/

I suspect a lot of new dacs sound better than your Cambridge but it doesn't have to do with just jitter.
Thanks, everyone, for your inputs. Unfortunately, much of what was said went over my head....

You’re welcome. Honestly I think you may be over thinking this. Go with whatever your monetary budget allows, your personal listening impressions, manufacturer reputation and other customer testimonials. After all that then consider jitter and other technical measurements. Just my recommendation.
Here is a video I often recommend with a simple explanation of what can go wrong with a digital signal fed into a DAC. It includes the topic of jitter. While discussing the signal passing into the DAC, its principles can also apply to the signal within the DAC unit.  Please let us know if this helps.

https://www.youtube.com/watch?v=grzoqEb2KMk&t=2s