ethernet-to-S/PDIF converter - something like this? http://www.ultrahighendreview.com/simple-design-rendu-ethernet-to-spdif-converter/
Yes, that is one such device. Another much less expensive converter from the same company is
this one. As I indicated, though, I have no particular familiarity with such products, and I have not taken the time to study them in any detail. For one thing, I don’t know offhand if those particular products are suitable for playback directly from a computer, or from network attached storage, or both.
Another possibility to consider, if the computer is a desktop model (as opposed to a laptop or tablet), would be to upgrade the sound card to a high quality professionally oriented model such as the
Lynx E22 ($699), with which you would also need this $40 analog
breakout cable, the combination providing analog XLR outputs having exceptionally good drive capability. You would also need an additional XLR cable, such as Mogami Gold Studio which I mentioned previously, to provide the necessary additional cable length. Or, alternatively, it MAY be possible to connect the E22 to the DAC via S/PDIF using this $30
digital breakout cable plus a BNC to RCA digital cable providing the necessary additional length. (I’m not certain of that, however, as the entries in the description relating to S/PDIF are unclear).
There may be other models from Lynx that are also worth looking into.
Lots of possibilities to consider.
Regards,
-- Al