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About Balázs

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  1. No you didn't. First, I didn't say you must use an expensive power cord. I was talking about using a quality power cord. I just happen to have a quality one which is undoubtedly very expensive. You must find the sweet spot in your system. Second, most of us use the HdPlex 400 because it is the only LPSU that can power a PC motherboard (ATX/EPS) directly - not because it was the best LPSU available which it isn't. @romaz mentioned that an LPSU with the same funcionality made by e.g Sean Jacobs would cost around $3.500 - $4.000. Although I can easily accept that such an expensive LPSU would top the HdPlex 400, even this one could benefit from a good quality power cord. Third, a quality power cord is not the only way to improve the LPSU. Linear voltage regulators like the HPULN-PS, also improve a lot - they are rather difficult to use in case of powering 24 pin ATX. And yes, you should take a lot into consideration before running to the next AQ dealer with your Amex Black Card in your hand 😉
  2. All of us who aren't lucky enough to own an SR7 should try a quality power cord with the PSU. I connected an AudioQuest Dragon HC 1.5m to my HDPlex 400 (that drives my dual box Euphony source). It's worked magic on the SQ.
  3. I assume your music is on a NAS or you listen to streamed music like Tidal. If the music files are on an internal SDD/Optane/USB drive I'm not sure how the network could have any influence (only control information flows to the Euphony server)
  4. I'm not aware of such a chassis (I wish I were). I use Thermaltake's TT Premium PCI-E 3.0 Extender. I tried with and without it (direct in PCI slot) and didn't hear a difference.
  5. Come on, that's the name of game 😉 But I see your point and getting the Stylus SQ while keeping Roon is currently expensive. I hope that someone will figure out a more cost effective way. Roon is still a must have to manage music collections imho.
  6. I agree on that and I also have the Omega Alnico drivers. Try to use Roon Server on Euphony to reduce the harshness but you would loose the benefits of Stylus. To get back to the fuller SQ while keeping the harshness down I suggest the dual box Euphony/Roon server setup I described earlier. One thing I'm going to try is to install Jplay femto (on Windows) on the Endpoint while keeping Euphony with Roon Server on the Core. Might be a "best of both worlds" situation.
  7. I get equally good SQ in my dual box configuration with Roon. Now first of all equally good SQ is not the same SQ. In my system Roon gives a drier but the same time a bit more precise and a lot more natural presentation than standalone Stylus. On the other hand to achieve the better-than-single-box-Stylus with Roon is a rather expensive way to go and might be interesting only for those who would like to keep their Roon environment. In my system the following design principles must have been considered (besides the well known regarding CPU, Ram, etc.): 1. Forget about the standard NUC as an Endpoint. Although it provides very good dynamics and soundstage, it 's not able to control the bass neither to give the same level of detail like a PC with dedicated interfaces 2. The Roon Core must have an audio grade network card (mine has a JCAT Femto NET) 3. The Roon Endpoint must have both an audio grade network and an USB card (mine has JCAT Femto NET & USB) 4. The more power phases the motherboards has the better the SQ might get. I utilize the Asrock Z390 Extreme4 which provides 12 power phases and two PCI slots driven by the CPU plus multiple M.2 slots for Optane drives . 5. The signal path between Core and Endpoint must be taken care of (REF10, audiograde switch and LAN cables etc.) 6. Both(!) the Core and the Endpoint have to be Euphony Roon servers. Yes, even on a bridge the Roon server software sounds better. Therefore two full Euphony licences are needed, unfortunately. 7. The client connection type must be Roon Bridge. No StylusEP, no Squeezlite. Having built a dual box server according to these principles I managed to top the single box Stylus in MY!!! system. No guarantee it would work in yours.
  8. Thanks @Dutch. A couple of days ago I ordered an M.2>PCIe adapter and a dual slot riser card. As soon as they arrive I will be able to try them with my JCAT cards and NUC7i7DNKE. https://de.aliexpress.com/item/M-2-NGFF-NVMe-M-Key2280-To-PCIe-3-0-4x-Riser-Card-Cable-PCI-Express/32833359557.html?spm=a2g0x.10010108.1000016.1.7b204ca20TfFxB&isOrigTitle=true https://de.aliexpress.com/item/Dual-slot-pice-PCI-E-X16-extension-card-2U-PCI-E-video-card-graphics-video-card/33003556007.html?spm=a2g0x.10010108.1000016.1.5d6c48f6Vea8Z8&isOrigTitle=true One more gadget I'd like to play with is the picoPSU. I know that these units have already been discussed here but I'm not sure about how they perform when connected with the 19V output versus the ATX output of the HDPLEX 400W. The single 19V option also provides an easy way to improve by regulators (LT3045 etc.) Last but not least I found a pretty strong 200W picoPSU "clone" called Dynamo Mini by KMPKT. Interestingly, it's HDPLEX who builds this PSU for KMPKT. https://www.sfflab.com/products/kmpkt_dynamo_psu P. S. Thanks a lot for the information regarding the coming SOtM netword card. Now I understand why May refused to clock the JCAT cards saying they "don’t modify the products for other brand products"
  9. Has anyone tried an Intel NUC Roon endpoint with the JCAT femto cards yet? Using a PCI riser dual adapter for the external USB and NET cards could be a SOtM reclocking alternative, couldn't it?
  10. This is someting I'd also like to do but , there are some challenges that should be addressed first. ATX specification The specification of the ATX24 interface needs 3.3/5/12/-12VDC. This mean you should "produce" or convert a lot from your HDPLEX to get to these voltages. Power Another issue the power need. According to Molex a fully populated 24 pin Wire-To-Board connector could deliver 8A per pin. The HDPLEX 400 specification of the ATX output: Output Voltage Max DC Current Full Load DC Current Output Voltage Tolerance Ripple (mV) +12V 20A 18A 2% 3mV -12V 1A 0.5A 2% 5mV +5V 16A 13A 2% 3mV +3.3V 16A 13A 1% 3mV 5V SB 3A 12A 1% 5mV The "strongest" LT3045 Stammheim board has 5A max... Voltage drop The Schottky diodes drop 0.4V and the LT3045 has also some loss but very low. The Stammheim board drops 0.8V of DC input. I'd really use a higher DC output of the HDPLEX to get down to the neeed exact voltage value. I would suggest to get a single DC powered motherboard like the ones @romaz and @seeteeyou mentioned but you'd like to optimize your Roon/HQP server that takes much power. This will be a rather difficult task
  11. You are absolutely right and I didn't invent to design a new PSU. I just wanted to have a single source of good quality DC instead of many smaller PSU based on my existing HDPLEX 200. I really like what the 3045 did to the HDPLEX. It can be that it's not the 3045 that makes the difference but the HDPLEX represents a rather low quality power.
  12. Yes the LPSU is based on the standard output of the HDPLEX 200. First I tried to get direct AC input from the transformer. Although it worked (I had to use diodes on the Stammheim board) I didn't notice any sonic benefit against the DC driven approach. I am no expert at all but I think the slower regulators don't really matter if they are before the faster ones in the regulation chain. On the other hand my goal was to improve on the HDPLEX 200W I already had not to build a new one. I didn't really want to bypass its protection circuits (Overvoltage , Overload protection,Overcurrent protection, short circuit protection)
  13. As DYI and the LT3042 have been mentioned: several months ago I managed to significanty improve my HDPLEX 200 W LPSU (andaccordingly the SQ) with utilizing some "Stammheim" boards. Each of these boards use 6x LT3045 in parallel and I use two boards in a serial configuration (after some heat reducing pre-regulation). You can see an early version of the "improved" LPSU on the attached photos. I still use this configuration to provide clean 12VDC, 5.5 VDC and 5VDC for my digital chain (SoTM devices, Mutec MC3+ USBs, etc). I'm planning to use other versions of this regulator board to feed the JCAT Femto cards and eventually the complete motherboard (ATX24) of my Roon server.
  14. When I changed the two MC3+USBs to be driven by LPSU I also removed the USB card from the second unit which has contributed to the sonic benefits.
  15. Yes my input signal is via USB coming from an Uptone ISO REGEN + masterclocked SOtM tx-USBultra combo.
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