Apple uses a custom DAC chip which does not offer S/PDIF services.
The best way to gain Hi Def audio is to use an external USB DAC like this one: AudioEngine D3
I think you're over-focusing on jitter here, we are talking about the output side of things here correct?
You talk about laptop power supply as a jitter source, it would create noise not jitter. But to be fully truthful here unless you have a very dirty AC power noise won't be an issue (hint: use a UPS or good surge suppressor).
The USB cable and the DAC won't create timing issues as there is no reference point for a timing issue. The timing is more a factor of the computers ability to process Vs the signal going across the USB cable. Yes, the signal will be delayed across the USB port and the conversion process within the DAC is that the timing you are concerned with? You can't really alter it.
In our studio I think we are using an Antelope A/D Converter (I don't remember the model) for our audio recording for presentations with a Mac Pro (the newer generation). The audio is then saved on a Thunderbolt based SSD RAID system (we also do video editing on it). Once created we play it back across a D1-24-Bit-DAC to the studios speakers.
In any case you can encounter jitter from the analog inputs going into the A/D converter and if the converter does not offer a digital optical output the signal here as it enters your system. Is that the area of your concern? The input side of the A/D conversion? Vs the D/A output side?
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digital coax:
why? just because it's the only way into my HiFi DAC. So I need to convert the digital audio file at some point from USB, minidisplay port or hdmi into digital coax.
TOSlink:
seems to have such pros indeed but also its cons; for one, it tends to be capped to 24/92 where coax goes up to 24/192.
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