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About ray-dude

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  1. We actually had a lot of early success in our DC power experiments by "borrowing" components and strategies from competitive drone and RC racers - the goals of instant response to dynamic loads is very aligned, and it was shocking how well things scaled even at extreme dynamic current capabilities (1000A, etc). I think there is much to be harvested and learned from these adjacent spaces (almost all of which is a lot cheaper than what we're used to dealing with at the bleeding edge). All the better if you have a closet full of parts to experiment with (please share as you find ou
  2. We did a lot of this math at the very beginning of PGGB (before it was called PGGB). Very hard to make it work. Only idea we came up with is find a buddy with symmetric fiber to the home and unlimited data and no throttling, and put a shared server in their closet (says the guy with symmetric fiber to his house and a server in his closet)
  3. Before people get out the liquid helium flasks, the funky thing about super conductors is that when you actually try to drive current, you break coherence in the transport and it becomes a regular conductor. At that point, it becomes resistive, generates heat, flashes your helium, temperature spikes, and much sadness ensues (low temperature physicists have our own version of magic white smoke ;) In a more practical realm, for DC it is all about how quickly the supply can react to dynamic loads. The impedance (resistance + capacitance + inductance) of the supply_cable+connectors is
  4. Great write up Rajiv! Having had prototype components strewn all over my living room and dining room for 6 months, stepping backwards to my DC3 was a very very difficult thing to do. Can't wait to hear the pre production units and some of that ARC6 magic again! For DC4 owners, be prepared for an absolutely stunning lift to whatever impact DC4 has in your chain. Pretty remarkable, esp. with a device that scales like the Chord DAVE.
  5. I have two routers (Edgerouter X SFP). On one ERX I have one Ethernet port configured as a subnet. I put my music server as the only device on that subnet my second ERX is configured as a dumb switch. It has all my home Ethernet and wifi access point connected to it. the ERX’s are connected by a short run of optical fiber, which lets me electrically isolate the router with my music subnet from all the goodies on my home network (including the wifi access point) I have fiber to the home, so I go fiber to ONT (high quality power) to Ethernet to ERX router (high
  6. I should clarify that when I was experimenting with VLANs, I did have firewall rules to connect the networks. Moving to a subnet let me get rid of all that stuff (I have my music server as the only device on my music subnet, and it is connected to a port on my router that is dedicated to that subnet). Lots of different ways to skin this cat, and I'm 100% sure that someone who actually knows what they're doing will have a better way ;) Alas, reconfiguring my network was WAY to time consuming to do a proper A/B, but I was happy enough with SQ and simplicity of subnet s
  7. I'm far from a networking expert (I tapped out on that stuff back in the late 90s) so your implementation may be equivalent from a packets getting to your server. There MANY networking savvy audiophiles here, so I welcome correction/education. As a pragmatic point, when I went to subnets, I got my server isolated, and didn't have to play games with firewalls, etc (really simplified my home network setup). I am certain there are better ways to get to the same result though...
  8. I've found in forum posts, people use VLAN and subnets interchangeably. They are actually different (logically, and for what the NIC sees) With a VLAN, each packet is tied to a VLAN ID. At the network router level, there are different logical networks based on the VLAN ID. For example, on my home network I use separate VLANs for guest network, IoT network, etc. VLANs let me isolate networks from each other for security reasons, but everything is using the same wiring and WiFi access point. With a subnet, it is a different IP range for the subnet. At the router, on
  9. That's a question for @Fourlegs I think. He's done great work experimenting with quality rails to Qutest. Nick did you experiment with TT2 as well? I have not (yet) cracked a Hugo2 or TT2 to bypass the batteries/supercaps and power the DAC directly from an external supply. I think you would get the maximum benefit with those extra batteries and caps out of the path (batteries and caps can have a great impact before the supply voltage regulator, but I prefer them out of the path after the voltage regulator)
  10. Listening to the new remaster of "Blue" A wonderful way to break a 3 week music fast (edit: cleaner, but less life than the 2013 remaster)
  11. These apples to apples comparisons are very difficult. Different USB chipsets matter. Any internal sample rate conversion or bit depth conversion matters. Isolation and RF and ground paths matter. You will hear differences, but untangling what is causing the differences can be more involved than obvious at first glance. That being said, if one sounds better than the other, there is much happiness to be had to just enjoy the better sounding music ;)
  12. Fantastic post and summary. The magic of PGGB is all these factors coming together, and control being externalized from your DAC so you can optimize digital processing in software to get the absolute most out of the actual digital to analog conversion stage of your DAC. Each DAC will have its own optimal recipe, and some will be easier to bypass their internal digital processing than others. Hopefully over time we'll see some world class DACs that are designed from the get go to externalize all their digital processing (for example, I'd love to hear PGGB content directly feedin
  13. This is why I love Audiophilia - if it's worth doing, it's worth overdoing ;)
  14. With my OOM issues, I was at 2B taps +. When I manually capped off the number of cores, it ran cleanly. Watching memory use tick up, it was pretty clear about when things tipped over. All on Intel, so not related to a translation layer. If you can dial down memory use (fewer taps, fewer cores) you can tune away from OOM zone.
  15. I have same issue on 2012 Mac Pro with 128GB (Intel) when processing some large DSD files. The crash is the watchdog giving up the ghost. I suspect the system is asking for swap but not getting it fast enough, so the watchdog barks. If there was preallocated swap (like there is on Windows), we wouldn't be having this issue. I do not have this issue when running Windows in VMware on the same Mac. I preallocate the swapfile in windows, and Bob's your uncle
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