Mono playback on Hifiberry AMP+


I’ve been trying to get mono playback on my Hifiberry AMP+ without success. The reason I need mono is I’m building the Raspberry running Volumio into a vintage radio which only has one speaker. How can I get both channels mixed into one mono output? I’ve been unable to find an answer that works with the AMP+. I really hope someone can help me with this!

Simple thing… Why can’t you join both output of the DAC and then feed the amp?

The amp+ is already the amplifier, I don’t really have any input to join except in software.