The DMP-A6 supports UAC 1.0/2.0/3.0 standard protocols, but the vast majority of DACs do not adhere to the standard protocols to provide support for DSD Native, and a specific driver needs to be added for each different DAC( usually a different USB interface). We have tried to support as many DACs as possible, but I believe this will be a long-term effort.
For those who have confirmed that your DAC supports DSD Native but it is not correctly reported in the A6's Source interface, you can...
Regarding DSD Native support of USB external DAC
For those who have confirmed that your DAC supports DSD Native but it is not correctly reported in the A6's Source interface, you can...
Regarding DSD Native support of USB external DAC