Speakers too Quiet? Try This

I was originally planning to though I damaged C127 while trying to parallel on top of it (end cap broke off), so just removed both. There is another reason you’d want to remove them though as high value MLCC ceramic caps have issues in audio circuits, they change capacitance depending on the voltage applied to them, they’re microphonic meaning vibrations will change the capacitance, and they’re just not the most temperature stable.

So replacing with a 100-330uF electrolytic (or better a bipolar electrolytic though they are quite big) will give better characteristics in addition to improved low end response.

Update:
Replaced the 100uF 16v caps with 330uF 6.3v audio grade caps. Not as dramatic of a change as going to the 100uF, but still a marked improvement, especially with the 16 ohm earbuds. I would recommend probably going with 220uF 6.3v as a sweet spot between cap size and bass response if you were to do this.

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