Found some 100uF 16v audio electrolytics that I already had as a test and replaced the 47uF ceramics with them. The 0603 pads were a real pain to deal with. They’re too small for putting a surface mount cap on so I was limited to through hole carefully mounted.
The difference is night and day for the audio output on the headphone jack with much improved bass response and the audio as a whole sounds much more rounded out.
I’ve got some 220uF 6.3v caps coming from digikey which should do a slightly better job and should be a little smaller as well for a better fit. As it is there’s enough room for them, though I’d want to probably glue them down to the jack to prevent vibrations from straining the pads.
