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Puma Cat

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  1. Hi John and Alex, Any word on this (hopefully forthcoming) white paper? Its been two months now since this was posted. Personally, this white paper would be an excellent reference for me to show to friends and fellow audiophiles about the John's discoveries of the role of high-impedance leakage currents on clock phase noise, and the benefits that ER brings in addressing this. Cheers and thanks!
  2. Hi Gang, Sorry I've been away since my last post...I've been VERY busy my first articles for The Absolute Sound. Just wanted to update my previous post about the ER: I've now obtained a 10Gtek 850nM optical transceiver, the one that Alex and Uptone Audio recommends. It worked upon first install and has been functioning perfectly since. No dropouts, and to date, no issues with it the optical transceiver disconnecting from barely touching or moving the ER. So far, so good, and I'll update my observations and final thoughts with time as I use this new optical transceiver. Cheers, gang.
  3. Consistent product robustness problems with the the SFP Cage and Optical Transceiver on the EtherREGEN: Since I received my ER back in October, I've experienced consistent problems with the SFP cage and optical transceiver on EtherREGEN. I am using the Sonore SystemOptique-certified 850 nM optical transceiver (purchased from Sonore) in the ER's SFP cage. My experience is that even if barely move, or in some cases, even touch the ER or the Tripp-Lite OM-1 specification optical cable that is plugged into the OT, the OT almost always disconnects in the SFP cage, and then I usually spend a considerable period of time trying to get the digital audio steam from my server to connect. Today, after placing my digital streaming front end a nice maple board, I just spent >90 minutes trying to get ER to connect up. To say it was exasperating was putting it mildly, I was just about to give up and spend the afternoon listening to LPs when it "connected" again and I could stream my files to my SOtM SMS-200 UltraNeo. 🙀 Back when was I was working as Design for Six Sigma (DFSS) Master Black Belt, teaching product development principles to scientists and engineers for one of the leading biotech companies in the world, there was a key quality attribute that I spent a lot of time drilling home: the concept of a ROBUST product or system-level ROBUSTNESS. A "ROBUST" product is defined as: "Function performs on-target with minimal variation in the presence of NOISE factors." The noise factor here is the optical transceiver module, and presently, the SFP cage/OT interface of ER is not robust to the optical transceiver utilized. ER should work in a statistically robust manner with any industry-standard specification 850nM, 1000-Base SM MMX fiber optical transceiver, and in my experience, with the number of times that I (and for reference, a good friend that has also an ER) have had the problems described above, this is not the case. I know folks will chime in, here..."Oh, don't use that optical transceiver, use this OT, instead." Look, gang, I get it, and I'll have to do that, I guess, in order to have a consistent and less exasperating customer experience. But, so that I am maximally clear here: that is not the point of this post. The truth of the world is this: There are NO, and I mean, NO perfect manufacturing processes or perfect products, from any manufacturer in any industry. None. They do not exist. The Japense have a very specific term for their philosophy about designing and manufacturing products: KAIZEN (Change for the Better, ref here: https://en.wikipedia.org/wiki/Kaizen) The key point about kaizen is to work with humility and open-ness with a spirit of "continuous improvment" so that overall product quality increases continually over time. When product quality improves, the customer's ability to use the product and their experience improves, and society as a whole improves, too. Understanding this key principle with humility rather than indignation is the basis for one of the highest quality manufacturing systems the the world, The Toyota Production System (reference: The Toyota Way by James Likert). This post was written in the spirit of kaizen with respect to helping Uptone Audio developing what is truly an excellent product into an higher-quality one, specifically with respect to product robustness. One that will realize its full and considerable potential all the while providing 1) a function performs on-target with minimal variation in the presence of noise factors and 2) a satisfactory customer experience. Right now, its not doing that. Improving ER's "robustness quality attributes" will not only improve the customer experience, it will also lower service, support, repair, and warranty costs, a lower COPQ (Cost of Poor Quality), and result in greater profitability for Uptone Audio. And that's a good thing; I sincerely want Uptone Audio to be maximally profitable and successful as they bring a great deal of innovation and value to the audio industry. And, they're really nice guys, too. Alex, happy to work with you and Uptone Audio as a professional DFSS resource regarding the SFP/OT robustness quality attribute in any way I can. Feel free to reach out. all my best, Stephen
  4. Its because the crystal oscillator in the clock has to come back up to temperature and stabiliize. When you disconnect power, it cools down. This is a key requirement for crystall oscillators to provide a maximal functional response. Also, crystal oscillators are VERY sensitive to vibration so they benefit from mechanical decoupling from the surface, rack or cabinet they are on. I use Herbie's Tenderfeet under mine to good effect, removes some haze and and improves image "focus".
  5. Yes, it is...using one to connect Mac Mini to Router and one to connect ER to SOtM UltrNeo.
  6. Apologies for the digression, Alex. I don't plan on tiliting at windmills, but thanks for the heads-up on the other thread. Cheers, PC
  7. Amir is the worst type of "scientist" in that the underlying "principles" (if you could call them that) utlized at ASR are not real science (like the kind of science I did in my career & published multiple times as a first author in journals like Science, The Proceedings of the National Academy of the Sciences, Journal of Human Genetics, et. al.) but rather a specious manifestion of "pseudo-science" along the lines of Jean-Baptiste Lamarck (ref: https://en.wikipedia.org/wiki/Jean-Baptiste_Lamarck).
  8. Yep, I get it, Alex. But I do have to dust the audio rack from time to time! 😉 One of the times the optical transceiver disconnected was when I simply lifted up ER to put some Herbie's Audio Labs Tenderfeet for micro-vibration absorption underneath it (which BTW, *do* result in an audible improvement, as they do when under an LPS-1.2>). Cheers, PC
  9. Thanks, Octaviars. I've found the FS site for the fiber optic transceivers. I note a "GE" designation on the sticker for yours. Does that refer to a "Generic" network designation? I noted that FS.com has specific transceivers for Arista, Juniper networks, etc, The stickers on these have AR or JU on them, respectively. Yours has a GE, I'm presuming that's for a Generic network. thanks!
  10. I didn't say the SFP cage was loose. The SFP case is soldered to the main board at, IIRC, 9 points and is secure. What I said was that the fit of my optical transceiver into the SFP cage has consistently proven to be problematical. I can move the ER just a little bit, and the fit/connection between the optical transceiver can disconnect. I know that it takes quite a bit of force to install the optical transceiver to get it to seat securely, and I apply quite a bit of force when inserting the optical transceiver into the SFP cage. Sometimes it connects up, but many times it does not. What I've consistently experienced is that it takes several attempts and a fair bit of "fiddling" to get it to connect up.
  11. Yes, I've been having consistent issues with this. Everytime I move the ER (e.g when I dust the audio rack), power it down for various reasons, the optical transceiver in the SFP cage usually "comes loose" and it has taken me typically a considerable degree of fiddling to get it to connect up again. I am using the Sonore "System Optique"-specificed optical transceiver. If anyone knows of an LC optical transceiver that works better, I'm all ears.
  12. My system sounded with ER sounded wonderful with V1 and now sounds wonderful with V2: natural-sounding, spacious, quiet, sweet and engaging with a real sense of "listening ease." As another friend of mine who recently got his ER said, there is sense of "rightness to the harmonic structure" that is really lovely. Life's too short to get caught up in minutiae; I'm not geekin' out over code, PHY chips, flip-flops, or firmware revs. I'm movin' on and just listening to, and really "enjoying the music", to paraphrase Hans Beekhuyzen. Those of you in the SF Bay Area are welcome to swing by and have a listen to the Harbeths. Cheers.
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