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  1. Puma Cat

    Power Cable Lifts/Risers, etc.

    Those are really cool, Mark, makes for a much tidier dressing of the cables. Thanks for sharing.
  2. Puma Cat

    Re-imagining "Class A" Amplification

    I met Angus last year at AXPONA, on the very first day, when he and Nelson Choi were setting up the Lumin room, and we had a very interesting discussion about audio component design. IIRC, Angus also designed Lumin's amplifier, apppropriately named, "Amp". Would love to review that someday for...
  3. Puma Cat

    Core Audio Racks Arrive

    Recently recieived my Core Audio racks from Core Audio founder and craftsman, Arnold Marr. Here's some info on these superb audio racks, crafted by hand: PlyKraft Platform The new plyKraft platform is composed of domestic high density FSC & CARB certified Apple-Ply. The massive 2” Apple-Ply...
  4. Puma Cat

    Shunyata Grounding System

    Just trying to help out. Cheers and have a nice day.
  5. Puma Cat

    Shunyata Grounding System

    The Denali 6000v2 Specifications table specifies there are 6 zones of isolation on the Denali 6000 v2. This is also unambiguously specified on the Denali 6000v2 product web page: https://shorturl.at/gnIO7 "Design advances within include objectively lowered noise, 6 zones of isolation and...
  6. Puma Cat

    Shunyata Grounding System

    Zeotrope and the Shunyata roadmap is correct. If the IEC receptacle only has two prongs, and no "ground pin", then you should not connect that device to an Altaira or Gemini ground terminal. The Altaira "roadmap" was written for a reason, so that end-users can determine if, and if they can, then...
  7. Puma Cat

    My First Sound Presence Deluxe III-Si 4.0 preamp with Paramount Special Edition upgrade

    No worries. Those who know what this preamp is, how beautifully designed, engineered, and crafted it is, and how capable it is in providing a beguiling and engaging musical experience...know. And, ultimately, isn't that what it's all about? Cheers, and as Hans Beekhuizen says..."Enjoy the...
  8. Puma Cat

    My First Sound Presence Deluxe III-Si 4.0 preamp with Paramount Special Edition upgrade

    None of those preamps are of the same model, nor the same level of engineering specification, of the First Sound preamplifier I'm selling. Those are older models and have only a single external power supply. Moreover, the last model listed is a passive preamp, so it's not pertinent to the...
  9. Puma Cat

    My First Sound Presence Deluxe III-Si 4.0 preamp with Paramount Special Edition upgrade

    It's an incredible preamp, the best I've ever heard. And, no, there are not a lot of them for sale on the used market. In point of fact, you hardly ever see them up for sale, and the reason is because their owners, like Bob, are very happy with them. Those who know....know. Thanks for the...
  10. Puma Cat

    My First Sound Presence Deluxe III-Si 4.0 preamp with Paramount Special Edition upgrade

    It's very common behavior on male-dominated internet forums. We've all encountered it before, as you know, Bob. And, it doesn't matter if it's audio gear, cameras, sport bikes, sports cars...it's all the same behavior. If you stated "f=ma", some guy will give you an argument about it. I just...
  11. Puma Cat

    Can a Linear Power Supply Inject Noise Into its AC Circuit?

    My hypothesis is #2 would. But, why not "be like a scientist" and do a "controlled experiment" to find out? Try both, and listen for what sounds best. Whatever you like best...go with that.
  12. Puma Cat

    Can a Linear Power Supply Inject Noise Into its AC Circuit?

    and Thanks, gents, excellent information. I'm going to read through this info as well. More data for the "database" is always a good thing. Cheers.
  13. Puma Cat

    Can a Linear Power Supply Inject Noise Into its AC Circuit?

    I think it’s important to understand that not just the LPS for digital-domain devices, but the power supplies inside our “analog” amplification components themselves can, and usually do, contribute a significant amount of noise to our stereo systems. A principal contributor of noise are the...
  14. Puma Cat

    My First Sound Presence Deluxe III-Si 4.0 preamp with Paramount Special Edition upgrade

    Yes. A friend let me audition his for a couple months in my own system before I bought mine. It was that experience that led me to decide to buy one.
  15. Puma Cat

    My First Sound Presence Deluxe III-Si 4.0 preamp with Paramount Special Edition upgrade

    Normally, I would never part with mine, but I've just gotten to a place where I really need to have the simplest system set-up possible. Part of this is due to the challenges I had with other components (e.g. my SOtM network bridge) that I was using in my system at the time and my network, where...
  16. Puma Cat

    My First Sound Presence Deluxe III-Si 4.0 preamp with Paramount Special Edition upgrade

    Yes, that is absolutely correct. Just a wonderful person of high integrity.
  17. Puma Cat

    My First Sound Presence Deluxe III-Si 4.0 preamp with Paramount Special Edition upgrade

    I think my First Sound is the finest standalone preamp I've ever heard. I agree they are an end-game preamp. That said, I also plan on selling mine, as I recently bought a really nice integrated amp, and I'm going to stay with that. It just allows for a much simpler set-up. I only need one PC...
  18. Puma Cat

    Amp Stand for Heavy Amp on Wood Floor?

    Herbie's Audio Labs Threaded Stud Gliders: https://herbiesaudiolab.com/collections/loudspeaker-rack-decoupling-and-isolation/products/threaded-stud-glider?variant=12651505745975
  19. Puma Cat

    Using Design of Experiments for Subwoofer Set-up and integration

    One of the really powerful things about DOEs, is you can build a good model, it can be use to show the "response" of the measurement(s) under study. Now, most folks are just taught in school about fairly simple approaches to characterizing a response, e.g. using a linear regression, where the...
  20. Puma Cat

    Using Design of Experiments for Subwoofer Set-up and integration

    The nice thing about using DOEs is, it's takes the guesswork out of optimizing a system. You literally obtain F-statistics and p-values that specify how accurately the DOE model "explains" the entirety of the measurement data for your system under experimentation. In statistics, we generally set...
  21. Puma Cat

    Using Design of Experiments for Subwoofer Set-up and integration

    Here is the result of analyzing the 20 Hz response of the DOE. We can see from the actual by predicted plot that the R^2 and r^2 adjusted are strongly correlated at 0.97 and 0.94, respectively, indicating that our results fit our model pretty well. Also the leverage plots (the factors...
  22. Puma Cat

    Using Design of Experiments for Subwoofer Set-up and integration

    Hi Guys, I thought I'd a share a robust, real-world experimental, statistically-based technique called Design of Experiments to optimize setup of a REL sub into my 2-channel stereo system. NOTE: While some might be of the view this thread would be a better "fit" in the 'Subwoofer/Speaker"...
  23. Puma Cat

    Shunyata Grounding System

    The (standard) guidance from Shunyata is that if you are going to start with a single ground hub, start with a CG hub. If you do, you can connect both the power supply and the DAC module to this CG hub, as well as your other amplification components. If you decide to add additional hubs at some...
  24. Puma Cat

    Shunyata Grounding System

    You should ground any unused interface port on the DAC module. Regarding the power supply, I'm not sure, as it it's not clear how one would connect a ground cable to the LPS. Perhaps using a chassis screw.
  25. Puma Cat

    Shunyata Grounding System

    That's a really excellent interview with Grant. Lots of really good information there. Thanks for providing the link.
  26. Puma Cat

    Shunyata Grounding System

    That is correct; the guidance is a starting or "reference" point. Folks should understand the Altaira hubs are completely passive devices, so you can experiment if you choose to do so. You are not going to "hurt anything" by starting out with a CG hub for your entire system, and then augment...
  27. Puma Cat

    Shunyata Grounding System

    That is correct and an accurate way to think about configuring a segmeted Altaira system. I respect that some folks might find the system (and the terms "Chassis Ground" and "Signal Ground") to be "confusing", but if folks read ALL the literature and guidance documents that Shunyata has...
  28. Puma Cat

    Shunyata Grounding System

    No worries! Here's some reference images for folks... Connecting from the Altaira 7th terminal to a Shunyata Denali (GP-NR) terminal.... Connecting to Earth Ground using the special AC wall receptacle ground cable from Shunyata....
  29. Puma Cat

    Shunyata Grounding System

    Actually, that's not accurate. With respect to proper installation and set-up of Altaira and Gemini ground hubs, they must be connected at their 7th terminal(s) to one of the ground terminals of the GP-NR system of an Everest, Denali, etc. power distributor, to make a proper connection to EARTH...
  30. Puma Cat

    Shunyata Grounding System

    100%. The worksheets are "mission-critical" to obtaining the proper and "effective" (doing the RIGHT thing) set-up. Shunyata knew how important these foundational points about grounding are, as well as the configuration testing results (again, usually conducted with an ohm meter) that are...

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