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About CG

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  1. I love this review. I also love the author's philosophy.
  2. This ^^ is the most sensible thing I've read this week. 👏 Wouldn't there also be some value in shorter sweep times but lots and lots of repeats to capture possible random events? There may be none, but you never know until you look...
  3. I think there's more to it than just that... The error correction and encoding schemes are pretty sophisticated, too. However, I get your point. In general, copper Ethernet sure is convenient and sure is cheap. But, it creates that storm sewer situation I suggested before. Somewhat OT: For better isolation, it's often worth trying battery powering system components. Not entirely convenient, but it sure is great for isolation and makes for an interesting test. (I'll keep my own results of this to myself.) A common opinion is that batteries often spoil
  4. I suspect a solution like this is better suited for network connected devices via Ethernet. One of the problems that network connected devices have is that the network is usually not only physically large, but has many, many connections. Connections not only to the network, but to other devices both through network connections but also the AC mains. That makes for very large and complex current loops that are not only hard-wired together, but couple electromagnetically. Kind of like a storm sewer. Think of what happens when it rains. Except, instead of water and junk, you have
  5. Who cares? Since you're using DSD in this design, the "converter" could be a simple logic device, followed by filtering and some suitable analog amplification and/or buffering. Presumably you could use an FPGA large enough that it would also do all the digital filtering and other processes. You could even add a USB interface to the FPGA for the people who don't feel the need to be network connected. Even SPDIF could be accommodated, right? In principle you'd end up with something like a PS Audio Direct Stream DAC that has maximum isolation between the digit
  6. OK. No need to be condescending. (How you were able to determine that to your own satisfaction without those many hours of consulting engineering time is something that I probably couldn't understand even if you explained that aspect of it to me. Please don't tell my boss...) Please note that I didn't even slightly, vaguely hint at whether these cables could change the sound of an audio system. I was just pointing out an example of an engineer from a generally accepted to be good cable company providing a mathematical analysis of what he thinks is the systemic aspect of cabling
  7. https://www.iconoclastcable.com/story/index.htm Note the links to objective analyses. Note that this a Belden guy. Note that these cables are sold by Blue Jeans. No opinions from me - just passing this along.
  8. This is supposed to be a sub-forum based on objectivity, isn't it? That kind of implies keeping the facts straight. Arm waving isn't allowed. First, RG-59 cable loss is specified for matched source and load impedances. In this case, 75 Ohms, which we pretty much never have in an audio system. The source impedance might be close enough to 75 Ohms, but the load impedance of an amplifier or preamp input is usually much, much higher. Starting at around 10K Ohms, typically. (Many input impedances drop as the frequency rises due to the use of an input filter, various compensation d
  9. Two things I meant to post but neglected to. One is a schematic of a simulated loudspeaker. This is the one used in the Stereophile amplifier measurements: https://www.stereophile.com/content/real-life-measurements-page-2 Obviously, different loudspeakers will be different and therefore present different impedances. Plus, it doesn't include various non-linear effects. It's arbitrary, but so what? If you really want to, you can derive the impedance over frequency for any loudspeaker reviewed in Stereophile by examining the impedance plot in the Measuremen
  10. I don't think you even have to drive it harder. There's always perturbations that affect things. If you measure circuits by themselves in ideal lab conditions rather than in a system (by system, I mean a collection of gear intended to work together) and average a lot of samples, you don't always get the full picture. Or, you get a distorted picture. However, this is getting off the topic of this thread, which I don't want to do. There should be adequate information above to give people a starting point for analyzing various conditions that might explain why different cables mig
  11. One more thing: Please overlook some of the obvious editing and proofreading errors in the posts above. My mind was trying to put information out far faster than I could compose and type it. (I also learned the statute of limitations on being able to edit one's own postings...) So, if I look like a complete boob, have a laugh. It's on me. My hope is that everybody who wants to can investigate this and other topics for themselves. That way you don't need to wade through the dogma and personal beliefs that everybody has. At least everybody who likes to post on the i
  12. Finally, want to measure this at home? Here's gadget that is a multi-purpose tool. No need to repeat all the specs here, but I'll just say that with the exception of some very specific audio related measurements, this box will let you make most measurements you'll need. With some add-ons, you can also measure impedance pretty effectively out to at least 10 MHz as well as measure gain and phase margin for amplifiers using closed loop loop feedback. https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/start If you want make those
  13. If you're already good with the basic stuff, here's some more specific information: https://www.analog.com/en/education/education-library/op-amp-applications-handbook.html There's more on that page, too. These two are specific to why amplifiers used to drive imperfect non-restive loads might be unstable: http://audioworkshop.org/downloads/AMPLIFIERS_OSCILLATION_BJT_CIRCUITS.pdf https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwiT-5ypvuPoAhXknuAKHXiqBSsQFjAAegQIAhAB&url=http%3A%2F%2F
  14. First, the general background information: If you generally don't feel confident in your electronics background, here is a terrific place to start: https://artofelectronics.net This covers A LOT. It's not all high level math, either. The most advanced are topics covered in high school algebra. (If you want to brush up on that, try here: https://www.khanacademy.org) More specific to audio is this book: http://www.cordellaudio.com/book/ Bob Cordell has been playing with audio gear for a few decades as his hobby. His day
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