question about volumio!!

I have a raspberry with volumio installed in the mini SD card.
the software works perfectly and update the database
when i connecte the RCA to the amplifier, there is no sound entering the amplifier.
what could be happen?[size=1]

Please provide more details about your setup. What is your Volumio output? Do you have a DAC? As a hat for the Pi?

Without knowing more I would suggest trying the amp with a different source (another DAC, turntable, etc) to confirm it works. And/or try the DAC output into a different amp to narrow down the issue.