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In Reply to: RE: Possible to split a 10Mhz clock output? posted by knewton on December 15, 2016 at 23:06:34
Thanks for your input. Didn't realise it would be so simple.Are such BNC splitters "good" enough for hi-fi, particularly since the idea about such clocks is all about precision?
Thanks.
Edits: 12/16/16Follow Ups:
Yes, they are good enough so long as they are accurately and stably impedance matched to the rest of the clock distribution network. The impedance matching will minimize jitter introduction by the splitter. Don't obtain some mysterious no-name part here, but there's also no benefit in locating some boutique part produced by the audio industry either. Simply source a quality constructed part of the correct impedance from one of the established RF connector vendors. The cost still will be quite minimal. Also, be sure it has the type of connector ends you require for mating to your coax, which are probably BNCs. Connector gender (male/female) will also matter.
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Ken Newton
Edits: 12/16/16 12/16/16 12/16/16 12/16/16 12/16/16 12/16/16 12/16/16
Thanks. Will keep that in mind when I need to get them.
The subject of using external or system clocks is more complex than finding a stable generator for the signal. The whole subject is way beyond my competence but I understand that issues such as phase behaviour and the PLL for distribution are important.
All dCS system clocks have multiple outputs so what you want to do is achievable. However they use " low noise, low skew clock distribution systems that get the clock to the point of use exactly as it was generated." - whatever this entails.
What is subjectively observable is that dithering the signal seems to improve the distribution (apparently has something to do with " dead spots" occuring in regard to the PLL). It is switchable on/off with their clocks so comparison is simple.
I have also experienced the significant changes in sound that comparing different generations of their clocks brings even though basic clock stability specifications are similar.
Unfortunately the choice of 75 ohm cable seems also to affect the resulting sound even given cables claimimg quite tight observance of the spec and with due attention paid to screening and using "audiophile approved" dialectrics such as PTFE.
I have also seen arguments from pro recording engineers that the use system clocks is worse then just letting each component run with its own inbuilt clock. I don't necessarily agree but the argument is out there.
So, as the subject itself is not very straightforward it is hard to guess whether BNC splitters are "good" enough for hi-fi.
Suck it and see. If you are happy with the result then that is what counts.
Thanks for your detailed reply. I'm aware of the controversy of using these clock implementations, and that's one of the reasons why I'm not going crazy with esoteric 's expensive matching clocks. The cheap custom made rubidium clock seems to work reasonably well with the player, giving a more expansive and solid sound.
Thanks again.
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