Rubidium Clock

For the standalone OCXO clocks as I understand it from a couple friends who have ordered the Ultra Premium/Premium versions, the answer is that in terms of phase noise being lower, etc...it is superior to the Rb-only clock in terms of overall musical presentation.  I cannot speak to their individual results as I was not in their rooms to hear but for my system, with the dual-clock unit using the same parts, power suppliers, etc...and itself and Ultra Premium level unit, I can tell you that I do love what the Rb side does for the system on many discs, however for my ears and most of the discs on my shelves, the OCXO provides a more musical presentation without sacrificing the imaging improvements and other things related to higher-precision clocking. Write on in-mail if you want to talk via phone or email more directly. Apologies for the delayed response as I've been off the forums due to work and life for a few days....

Thanks. I went ahead and ordered the UPOCXO-01-SSSS clock for my friend. We will try it with his Vivaldi stack, on top of the Vivaldi clock.

If it goes well, he may consider the UPOCXO-RK01-OP17 Ultra model, which is triple the price, but also offers 7 dBc/Hz lower phase noise level at 1Hz (-110 dBc/Hz vs -117 dBc/Hz) .

Good luck with breaking in the clock and all the testing; please let us know what you hear and determine about the overall sound with that configuration!

Have anybody tried it with aurender w20 with a word clock input & it already has oxco clocks ? 

Any device you connect to one of the master clocks from Cybershaft should support 50-ohm 10 Mhz master clock connections; note that there is much discussion in a couple of forums as of the last month or two that quotes statements from manufacturers using hard facts that claim that using a 75-ohm cable in place of 50-ohm is acceptable for short runs (1-meter, 1.5 meter, etc...typical between such devices). I happen to be using spec-compliant 50-ohm capables. That stated, the discussion and statements from 3 different clock manufacturers including Esoteric, Cybershaft and one other (think it is SRS or Antelope) state that for a 50-ohm input and output pair, using 75-ohm cables for these lengths does not represent a probable issue.  No discussion I have seen states that you can connect a 75-ohm cable to a 75-ohm input and route a signal (such as one from a Cybershaft clock of SRS PERF10, Antelope Isochrome 10MX, etc..>) made for 50-ohm and 10 Mhz in nature to a 75-ohm port.

I just read the Aurender W20 manual and spec. sheet on line; they are very good in terms of the step by step involved in setting up the server and playback software however, they do not seem to make any statements about how to setup/configure the clock input for what they state they support (from their website and product manual: "It supports both word clock (dCS DACs or similar) or Master Clock.(MSB DACs or similar)"

I would suggest you get specifics from Aurender regarding what this input on their W20 truly supports first and go from there. I’ve sent a question as well using their online form; if I heard back I will let you know.  The key questions;

- is their input a 75-ohm or 50-ohm connect (based upon context on their spec-sheet, I'd guess 75-ohm?
- does it truly support "master clock" frequency of 10 Mhz...?
- how do you configure the W20 to tell it which type of clocking input it is receiving?