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Elberoth

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  1. Both Ref 10 and Nano looks almost exactly the same - the difference beeing less outputs and SMPS vs linear PSU with integrated AC filter. Nano: Ref 10: It is easy to assume the 3dBc/Hz difference in performance (-112dBc/Hz vs -115dBc/Hz @ 1Hz) comes from linear vs SMPS. HOWEVER, let's not forget Mutec is also offering the excellent Ref 10 "120 limited" model (-120dBc/Hz @ 1Hz), which comes with a selected, higher spec OCXO module. So it is possible Mutec was left with a pool of OCXO modules that were not good enough even for the Ref 10 clock (offered less than -115dBc/Hz @ 1Hz) and just realised they can utilise them in a cheaper model, with lower specs, instead of throwing them away.
  2. Looking at the rear panel, it looks like a 11 or 13th gen NUC board in a more fancy case. Not surprising, since the Intel boards used in the original Nucleus/Nucleus+ are no longer available (at least not in quantities - you can still get them from various Internet vendors, but not from Intel directly). Lets hope they have also switched to much more reliable (albeit more expensive) Samsung SSDs, which will improve the overal reliability of the platform. PS. I'm sure that wooden top is not helping with cooling.
  3. What was the reason you bought the Innuos ZEN ? SQ improvement or other?
  4. NUC 10i7 current draw: Standby: 0.02A Idle running Roon: 0.56A Highest peak registered by my multimeter on startup: 3A @ 12V 3A @ 12V = 36VA 3A @ 19V = 57VA, so yes, Farad 3 PSU 19VDC @ 3A will be more than enough.
  5. The big toroid transformer feeds a 12V ultra low noise power supply module for the mobo (via PicoPSU). The mobo is a AS Rock J5040-ITX board - same as used by Ideon, 432 EVO and other server manufacturers. First of two blue transpormers feeds two LHY Audio 5V ultra low noise power supply modules (based on LT3042 regulators) that power two SATA SSDs. The second blue transpormer feeds Ian Canada Linear Pi Solo MKII 5V ultra low noise power supply module, which powers Ian Canada UcConditioner 5V ultra capacitor signal conditioner board, which in turn powers the Pink Faun USB card. There is also a Schaffer IEC inlet / fuse holder / power switch / mains filter module on the inlet. At present server runs Audio Linux with Roon Bridge installed. The next step will be to replace 12V PSU + Pico PSU with 3 separate linear PSUs to power the MoBo (3.3V, 5V and 12V).
  6. I'm glad they are using supercaps - they dramaticly lower the impedance of the PSU (all those LT3045 LDOs are great, but have high output impedance). They have already been using supercaps on the Ultra server PSU, but not on the USB card itself. I kind of DIYed PF Ultra server solution, using ultra low noise regulator from Ian Canada with his supercapacitor module to power Pink Faun Ultra OCXO USB card : Those two caps are 325F each and have ESR of just 1.7mΩ.
  7. I'm about to build an full linear ATX PSU for my next server/end point build. It will use a MoBo with an integrated low power CPU (10W TDP), that draws up to 3A @12V (3x12 = 36VA), depending on CPU load. It has the ATX power input. My question is this: how many watts to assign to each ATX power rail (+3.3V, +5V and +12V) ? Is the power draw evenly distributed between the rails, or is it say 80% on the +12V rail, 15% on the +5V rail and 5% on the +3.3V rail? My initial idea was to use: +12V: 30 or 40VA power transformer + 3A voltage regulator +5V: 15VA or 20VA power transformer + 3A voltage regulator +3.3V: 15VA or 20VA power transformer + 3A voltage regulator The SSD drive and PCIe USB card will use their own transforemers and power supplies, so they will not increase the power draw of the MoBo. The PSUs/voltage rehulators that I plan to use are those: https://www.mpaudio.net/product-page/msw-hpuln-ps-single-rail-3a At the moment, the MoBo is powered by 50VA transformer / 3A voltage regulator + PicoPSU which is more than enough (doesn't get hot or anything).
  8. @Superdad unfortunately, no slots for cards on the MoBo I'm using. ASRock J5040-ITX mobo with 8GB RAM powerd by ultra low noise 12V PSU + PicoPSU PinkFaun Ultra USB PCIe card, powered by ultra low noise 5V PSU + supercapacitors bank SATA SSD powered by ultra low noise 5V PSU Each PSU powered by a separate power transformer (3 in total). My next mod will be swapping 12V PSU + PicoPSU combo with dedicated 12V, 5V and 3.3V ultra low noise PSUs.
  9. @Superdad - this is a simple endpoint, so a single SATA SSD powered by a separate transformer and low noise +5V voltage regulator (3x LT3045).
  10. OK, I have disabled Web interface 1 and use Web Interface 2 and it has solved the problem - thanks! What is the recommended setup for simplest / best sounding Roon Bridge config? Isolated Core 3 for audio? Constant CPU freq ? RAMroot ?
  11. I'm using monitor + keyboard. Network connected via LAN (no WiFi). Here is a screenshot when CPU is off peak: And here is when it peaks - as you can see, a whole block of activities gets added: I get this activity every 2s. The installation is basicly default now.
  12. Now I have disabled Roon Bridge as well - so there is literally nothing running - and the system goes from 0 to over 50% CPU load all the time. This is crazy.
  13. Yes, avg. load is low, but it peaks @ 57% every 2 seconds. The system has been running for 30 min now - no change.
  14. I have Core 3 isolated for audio, not Core 0. If I'm not allowed to use isolated core for audio, why should I use Audio Linux in the first place? What is the benefit? It looks to be much heavier OS than DietPi - the system has 23 processes / 46 threads running vs only 15 is the DietPi. I have disabled max CPU freq limiation set at 800MHz (now it can go up to 2MHz), disabled RAMroot, disabled isolated cores, but that didn't change the behavior of the system one bit. There are still huge CPU load peaks and lots of activity going on!
  15. I have just installed AudioLinux classic on a J5040 CPU with 8GB RAM and only Roon Bridge service enabled and I'm experiencing continous HUGE spikes in CPU load up to 55.7%: I find it highly unussual, becuse with Roon Bridge installed on DietPi Linux (on the same computer), the CPU shows a 0.7% CPU load, wityout any major spikes (it changes between 0 and 0.7%): 55.7% vs 0.7% that is a HUGE difference in CPU load. Am I doing sth wrong here? System config info:
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