If you are using PCs, I think Steve's OffRamp converters are the way to go.
If you are using Macs and want to use Audirvana Plus, I'd recommend a USB-SPDIF that supports Direct/Integer modes such as the Wavelength Wavelink HS.
Like Steve says, USB-SPDIF devices vary in implementations and sound quality.
If your software doesn't support Direct/Integer modes, Steve's OffRamp is a much better sounding solution (tho at a higher price).
That said, I read elsewhere that Steve's next OffRamp would include a Direct/Integer mode compatible interface as well.
If you are using Macs and want to use Audirvana Plus, I'd recommend a USB-SPDIF that supports Direct/Integer modes such as the Wavelength Wavelink HS.
Like Steve says, USB-SPDIF devices vary in implementations and sound quality.
If your software doesn't support Direct/Integer modes, Steve's OffRamp is a much better sounding solution (tho at a higher price).
That said, I read elsewhere that Steve's next OffRamp would include a Direct/Integer mode compatible interface as well.