DFPlayer Noise on stereo DAC outputs

I've had good success with the DFPlayer, controlling with Serial Commands, and playing through the Speaker MONO outputs. I thought I would try making use of the stereo DAC outputs into an amplifier but I am getting noise (like a power line hum). Breaking the DFPlayer down to minimum: playing with the key inputs and powering with a battery, I still get the hum.

Anyone have this problem, or perhaps found a solution. I really like the stereo output but the noise is very evident when the playing audio piece is low.

Fred Miller

me too. I think it is more like some digital noise. did you have any success on fixing this?
thx !

Lots of decoupling. 1000uF or so?