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ray-dude

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  1. Some things are best left to the imagination Chris ;)
  2. Paul’s rules are arcane and Byzantine. There is no notion of what is right or fair, just whether the letter of the rule is followed or not. I think much of the (profound) disconnect between Paul and his custom build customers is the rest of us expecting reasonableness vs strict compliance to the rules.
  3. I'm definitely keen on hearing one...maybe at RMAF this year
  4. View Classified FS: Abyss AB-1266 Phi TC Lite headphones https://abyss-headphones.com/pages/abyss-ab-1266-phi-reference-headphone Basically almost new Abyss AB-1266 Phi TC headphones (lite package) Includes everything pictured: Headphones 8' 4 pin XLR cables 4pin to 1/4" adapter 4pin to speaker amp terminal adapter velvet bag card + box After break-in, these have maybe 40 hours on them. After pandemic hit and work from home, I listen to my home 2 channel setup almost exclusively Absolutely breathtaking headphones. Time for them to find a home where they are listened to. CONUS buyers only please. Buyer pays shipping and PayPal fees Seller ray-dude Date 08/04/21 Price 4,000.00 USD Category Headphones  
  5. This listing is completed.

    • FOR SALE
    • USED

    https://abyss-headphones.com/pages/abyss-ab-1266-phi-reference-headphone Basically almost new Abyss AB-1266 Phi TC headphones (lite package) Includes everything pictured: Headphones 8' 4 pin XLR cables 4pin to 1/4" adapter 4pin to speaker amp terminal adapter velvet bag card + box After break-in, these have maybe 40 hours on them. After pandemic hit and work from home, I listen to my home 2 channel setup almost exclusively Absolutely breathtaking headphones. Time for them to find a home where they are listened to. CONUS buyers only please. Buyer pays shipping and PayPal fees

    4,000.00 USD

  6. 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 out what is working and not working for audio!)
  7. 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)
  8. 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 actually load dependent (including frequency of dynamic loads). I will say that at the extreme low impedance values that we were experimenting with, the impedance of connectors and even wiring topology was non-trivial. Going from 3mOhm to 1.5 then 1mOhm made a huge difference on the digital 5V line (I wasn't able to experiment with the analog +- 15V lines). There was a 100% correlation between reducing the measured impedance of the energizing source and SQ. This made experiments and designing a final system much easier, but we were actually at the limits of the modest internal resistance meter that Roy mentioned in his post. Have an energizing source capable of fast massive dynamic current (these huge caps or very large high discharge LiFO4 battery packs), wired and configured to have the absolute minimum internal resistance as seen from the regulator, and you will be very handsomely rewarded with as near to an ideal output as your regulator is capable of delivering.
  9. 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.
  10. 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 quality power) with my audio subnet on one Ethernet port, and the optical port connected to the second ERX configured as a switch, with everything else on home network on that switch Since I put all this in place there have been a series of upgrades to the Extreme that have significantly diminished the impact of network optimizations. I have not backed out all these tweaks to see how much they still help, but I suspect I could simplify this chain further. It works well and is a modest investment, so I’ve been leaving well enough alone.
  11. 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 solution to declare victory and move back to playing with massive capacitor arrays ;) I will say that I currently have a WiFi switchable outlet on the power supply for my Sonore opticalModule that is at the head end of my music subnet. With my current playback chain, I can not hear a difference between having the oM powered up (aka server connected to the network) and starting playback and having the oM powered down (server disconnected from the network). No network is the ultimate reference to compare network optimizations against. I know several here that still hear a difference between an optimized network and no network, so as usual your mileage will definitely vary.
  12. 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...
  13. 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, only IP traffic for that subnet is sent to devices on the subnet (no briadcast traffic, etc). There is no logical separation of the networks, unless you're dropping filters or firewalls on the subnet. For the optical link from my router to my music server, the only network traffic is for the subnet I have configured for that port on my router. In this case, I have no security isolation, but I have physical isolation of network traffic on the wire/fiber. I use the later for my music server, and the former for devices I don't want on my home network (guest wifi, car, thermostats, etc). All the devices on my home network can "see" each other, but only network traffic intended for my music server gets routed to the NIC in my my music server. By not having broadcast traffic, some "discovery" features don't work, but everything I've used so far lets you explicitly configure the IP address of the music server (Roon, etc) What I have found to be effective is to have the NIC on the music server "hear" as few packets as possible. Subnets did the trick for me, VLANs did not (although when people talk about VLANs, they often are talking about subnets)
  14. 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)
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