I couldn't find R4 in the layout.
Correct me if I am wrong.
Apparently R4 is supposed to be connected directly on the chip (Pin 3 to Pin 9) for better performance!
I little odd and somewhat messy I think, but thats DIY audio.
Personally, when I get around to building this project out I'll edit the PCB and add R4.
This excellent project with in depth detail can be found at Circuitbasics.http://www.circuitbasics.com/design-hi-fi-audio-amplifier-lm3886/
Very true thats DIY audio. Excellent PCB layout and the project details very well described.
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