Wanting to move up to hi-res digital audio via my Rega DAC, I have acquired a Peachtree X1 USB to SPDIF adapter (Dell laptop has no SPDIF outputs) and have connected the DAC and the adapter via Toslink. My test case involves setting up JRiver MC19 and a couple of 96/24 albums as FLAC that I also have the CD of for comparison (Graceland and Oscar Peterson't Night Train). JRiver shows that it is reading the source as 96/24 and sending the output as 96/24, as well, but the indicator light on the Rega says 44.1 and it sounds exactly the same as the ripped CD files.
Is there any Voodoo required to get the Rega to recognize the hi-res input? Is the X1 (up to 192/24 capable) perhaps suspect?
In the meantime, I guess I'll have to borrow a computer that has native SPDIF output to remove one variable...