When you do DSD over PCM, there's a corresponding PCM sample rate for each flavor of DSD that your DAC has to be able to support. DSD256 it requires your DAC to accept 768k PCM. The C47 doesn't (which is fine, as 768K sampling rates are absurd), so DSD over PCM caps out at 2x DSD.
What's odd here is Jriver is by no means the only software that allows you to select Native DSD vs. DoP at various bitrates if your DAC supports it. I know fellow Roon users with other brands of DAC who see the option. Roon only allows you to select settings your DAC can definitely accept, others are grayed out. So if the C47 definitely supports Native DSD, which is the only way it would be able to play DSD256, as doing it with DoP wouldn't be possible given the lack of 768K PCM, I'm not sure why any software that supports Native DSD wouldn't work. "Just use Jriver, bro" doesn't really satisfy my curiosity.
I'd love to see one of our Jriver users post this same screen shot from their C47, showing all of the modes Jriver is detecting from the DAC. Note the iFi DAC in question supports 768X PCM and 8x DSD natively (iFi must sell to a lot of dogs and bats, I presume), so those options are "real" vs. simply theoretically allowed in the software.
What's odd here is Jriver is by no means the only software that allows you to select Native DSD vs. DoP at various bitrates if your DAC supports it. I know fellow Roon users with other brands of DAC who see the option. Roon only allows you to select settings your DAC can definitely accept, others are grayed out. So if the C47 definitely supports Native DSD, which is the only way it would be able to play DSD256, as doing it with DoP wouldn't be possible given the lack of 768K PCM, I'm not sure why any software that supports Native DSD wouldn't work. "Just use Jriver, bro" doesn't really satisfy my curiosity.
I'd love to see one of our Jriver users post this same screen shot from their C47, showing all of the modes Jriver is detecting from the DAC. Note the iFi DAC in question supports 768X PCM and 8x DSD natively (iFi must sell to a lot of dogs and bats, I presume), so those options are "real" vs. simply theoretically allowed in the software.