Rubidium Clock

Can anyone advise whether an Esoteric Rubidium clock would improve the sound on my Esoteric X-01/D2 player? I have been told "not much since it is a one box." But the reviews have seemed to indicate that the upgrade in sound quality is quite apparent. I am aware that some upgrades are very small in their ability to be heard, others are like a whole new piece of gear.
Any advice is appreciated.
Justubes2: Thank you once again for highlighting the lower phase noise/etc...on the OCXO side of my Cybershaft clock. The difference in terms of satisfying musical presentation of every note, more precise and natural imaging, etc...once I switched over and have been using that circuit as my 10Mhz baseline is not only noticeable but dramatically better! With the Rb circuit (as with my experiences a few years ago with the Esoteric G-0s Rb clock), I had precision in many ways but not the beauty and naturalness I am experiencing with the lower phase-noise OCXO-based presentation.  Thank you again!!!
Thanks for your posting on the Cybershaft zephyr24069. Nice to know your experience continues to be positive. I have a Premium OCXO in route.
Sibelius: Great to hear from you....what piece will you be driving with the Cybershaft Premium?  I am sure you will be very happy with the result based upon what I continue to hear here plus the results of 2 others who have recently received one of Kenji's premium OCXO 10Mhz units.  On day1 it's an impressive difference,...once the power supply and OCXO get broken in (seems to be the usual 300-350 hours is required) fully, I believe you will be even more happy!  Enjoy....let me know how it turns out for you!

You mentioned something about the HDPlex LPS, do you think it would be possible for Cybershaft to manufacture a unit to accept the power from the HDPlex.
I just contacted Cybershaft and mentioned that I have a few HDPlex LPS units laying around and I'm looking for recommendations for a 10MHz clock for my pair of Grandioso D1.
Hopefully I will hear back soon on the matter.
Ysound: you must have a very nice setup with the Grandioso gear!  For clarity, are you looking to add 10Mhz (50-ohm) clocking externally to baseline the MCL circuits in your D1s? If so, the Cybershaft is definitely worth considering....

To your question: I have no idea whether Cybershaft would produce a unit that takes a DC XLR 5-pin connector (like Wavelet) and would allow you to use an outboard power supply.  That would be a question to send to them directly.  I can tell you that with the power supply that is my the clock I purchased to begin with (designed by Cybershaft for best match and optimal performance), I've never sonically felt a need to look into this path for my setup here. The power supplies in the Cybershaft upper-line clocks are of excellent quality from what I hear out of my system.