There is not much point since S/PDIF is usually isolated by a transformer or TOSLINK transmitters. The jitter would be dominated by receiver’s pll.
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There was no mention of ASRC/FIFO, does OP has them in the system or it is just DIR->DAC?
Could be they don't know how to do it better, or else they don't want to spend the money. Not sure.
JL Sounds I2SoverUSB is probably the preferred solution for now. Best if powered from two isolated clean linear 5v power supplies. Better yet if also supplied with external ultra-low close-in phase-noise clocking, and then by reclocking the SPDIF and or I2S outputs. For I2S signals, a fair amount of discussion exists in other threads: https://www.diyaudio.com/community/threads/general-purpose-dac-clock-board.413001/ and: https://www.diyaudio.com/community/...2soverusb-pcm2dsd-rtz-dac.423401/post-7917601
Shouldn't be too hard to modify either a board or a set of boards for SPDIF instead.
Shouldn't be too hard to modify either a board or a set of boards for SPDIF instead.
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Then whats the point of buying the 75$ i2s usb board when you will be reclocking it anyways. Even the cheapest of the cheapest will give the exact same results with external clocking and reclocking.
In terms of build quality nothing comes close to Holo Audios usb board.
Galvanic isolation for one thing. Its a separate issue from reclocking.
Regarding Holo USB board, if you are referring to this thing: https://www.magnahifi.com/shop/ha-u...BmILSYnUcpI_yyh1U#attribute_values=43,181,754 or to the device at: https://www.audiosciencereview.com/...ments-of-holoaudio-xeme2ve-usb-to-spdif.6386/
...I would consider it virtually certainly inferior to what we know how to do here, if we we both reclock and isolate, especially if using SC cut crystal oscillators. You might want to seriously read the threads I linked to if you want a better ideal of what is possible.
NOTE: However, I will say it interesting to see ASR doing noise skirt measurements. Its been a long time coming.
Regarding Holo USB board, if you are referring to this thing: https://www.magnahifi.com/shop/ha-u...BmILSYnUcpI_yyh1U#attribute_values=43,181,754 or to the device at: https://www.audiosciencereview.com/...ments-of-holoaudio-xeme2ve-usb-to-spdif.6386/
...I would consider it virtually certainly inferior to what we know how to do here, if we we both reclock and isolate, especially if using SC cut crystal oscillators. You might want to seriously read the threads I linked to if you want a better ideal of what is possible.
NOTE: However, I will say it interesting to see ASR doing noise skirt measurements. Its been a long time coming.
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Can you name a suitable ultra-low close-in phase-noise clocking board that would fit in the same case as the JL Sounds?
There is Cestrian's board with Iancanada SC Pure clocks... The reviews if its used with a good dac are exceptional. Best dac most people have ever heard.
You might want to patch the 3.3v LVCMOS SPDIF signal from I2SoverUSB through one of the reclocking flip flops. Could be you would need to tweak the timing a little, so a 100MHz or better, 2-channel or better, scope is strongly recommended (actually its strongly recommended for any kind of dac work).
Okay. I prefer digital scopes for most dac work. Sometimes single sweeps can be very useful to take a careful look at.
Thanks much. I know there are certain applications still for an analog unit, but they are things I'm no longer planning on doing (and trying to lighten my load before a move). I do like the build quality of these Tek units, but lots of advantages to a modern digital oscilloscope these days - and lots to potentially go wrong with an ancient piece of gear 🙂
Analog can work too for a lot of what may need to be done. Having any kind of fast-enough scope is very useful. Otherwise you're blind in some situations.