Another vote for the Khadas Tone Board. It's just $99 and measures better than many more expensive DACs (check out audiosciencereview if you haven't already). For me, it's more fitting with the Crack than the $699 Schiit Bifrost. Rather than spend $300-400 for the Crack and $699 for the Bifrost, I'd rather spend $699 for a Crackatwoa and $300 for a JDS Labs EL DAC 2 or something similar.