Thank you Grumpy_Mike and Magician!
Always glad to learn more about this things. And yes, I think I can live well with 1% distortion level 8)
Not wanting to abuse much of your kindness, may I ask you a final question about this subject?
Is it possible to have both right and left channels mixed into the arduino analog input? I ask you this because I would want the spectrum analyzer to respond to both right and left channels.
Would that be correctly achieved by connecting both Lout- or Rout- to the arduino analog input using a 5-10 kohm resistor in series from each channel, and ground to ground?
Something like this...
10 kohm
Lout- -----^^^^-----
|
| ----arduino analog input
|
Rout- -----^^^^-----
10 kohm
LM4863 ground ---------------- arduino's ground