This is not a support site, you should contact support@nuprimeaudio.com and if you are from the USA, it is better that you create a help desk ticket on mytdss.com.
The reason is that our support staff does not read this forum. And I don't visit here every day.
Having said that, please try another analog source such as the headphone output from your smartphone. We can't debug your setup when you are using XLR to RCA adapter. If a normal RCA source works, that clear points to your adapter problem.