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rastus
1392
Nov 19, 2018
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I’ve been using a Corning optical USB, essentially a repeater, though by doing so, provides a very clean signal. It is not meant to power anything... the bad reviews are likely from trying to power something... and you are better off using a clean source regardless, powering just a usb node or whole DAC device. I have been using a Gemini at the DAC side as a splitter, feeding power from an LPS. The shortest one is long, real long as in 10m so just coil it, it’s optical with real VCSEL power;) the copper is just for the end transceiver power. I first heard of this product from a Corning engineer; made for long patch runs in server farms. Bought one as a “what the hell” thought something was wrong at first,, odd sounding,,, then it hit... it was clean... since then have seen others mention it.
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https://www.amazon.com/Corning-Optical-Cables-Cable-Meter/dp/B00JOJRF6K/ref=mp_s_a_1_3?ie=UTF8&qid=1542587914&sr=8-3&pi=AC_SX236_SY340_QL65&keywords=corning+usb&dpPl=1&dpID=318-ojHJO3L&ref=plSrch Thunderbolt, but same tech: https://www.youtube.com/watch?v=La4uQxDjJ6I
Nov 19, 2018
ProfessorPat
380
Nov 22, 2018
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rastusInteresting. I'd imagine transformer coupling would accomplish basically the same thing. My SPDIF inputs are isolated that way, but optical craps out at 24/192 so that's out, and I have no coax out on this board (though I think it has an SPDIF header, so that's probably easily remedied). I ordered a usb reclocker before seeing this option (though it is cheaper, and doesn't add 30ft of wire to an already cluttered space) so we'll see if that works, but this, or just switching over to SPDIF coax are backup plans. Unfortunate that toslink doesn't work for a bunch of my stuff, because this is nice when it works. Way cleaner than I'm used to listening to.
Nov 22, 2018
rastus
1392
Nov 22, 2018
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ProfessorPatHigh Fidelity Audio has basically been getting hand-me-downs... dual-purpose... this can work for you too... stuff for too long... time for a dedicated design... then others can adopt/adapt if they wish... An old post (rant;) https://www.massdrop.com/talk/2212/lets-see-yalls-rigs/2141950

Nov 22, 2018
ProfessorPat
380
Nov 22, 2018
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rastusWell yeah, USB is the generic pile of garbage that everyone uses for everything. It's hardly the ideal solution for a lot of things it gets used for. IEEE 1394 was better than USB ever has been and was used in quite a bit of audio stuff. If it didn't require you pay licensing fees for everything you use it with, and if you had the consumer level interest you have for USB gear now, perhaps we would have a dedicated audio data system. Ideally, we'd just get an update to AES3 that captures all of the high res stuff out there now. Toslink's little red LED surely isn't up to those data rates, and nothing in their spec (as far as I can tell) goes beyond 24/192. I personally don't care beyond that, but that's one of the big limitations of trying not to use USB. AES3 is fine for the most part, it's just old and in need of a consumer level update since everything is pushing USB. USB is in constant development (though that development is largely speed focused) and it's easy to make whatever piece of crap you can think of for it, so why not if you're the manufacturers right now.
Nov 22, 2018
rastus
1392
Nov 25, 2018
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ProfessorPatNeed an updated standard that includes DSD,, only everything audio, not a compromised codec trying to cover everything such as USB. It should be written purely for an optical system, Using-VCSEL-done, with transceivers on-the-board, cable is just a fiber, there can still be photon polishing fibers, pure and doped sapphire, coated/un-coated and gluten-free etc., that market remains,,, Toshiba’s photo diode ‘invention’ from 1983 is slightly dated, first designed for max 6Mb/sec. I may even pay for a dual frequency one with the music stream and data separate... no compromise (perceived),, if one were made...
Nov 25, 2018
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