All of my tests were done using two different headphones. The first set is an over the ear JVC headphone that is no longer available. My second set is a Edifier H840. Both pairs have good music performance (again – these are not what I would call audiophile) and give clear sound across the whole sound spectrum. The Pi I used was a Raspberry Pi 2B. It’s the only Pi I have right now that wasn’t committed to another project. Since all Pis have the same audio out circuitry, using an older model will not affect the tests. I used the latest version of Raspbian Stretch and mpg123 (mpg123 -a plughw:1,0 song.mp3) for music playback. For the music samples I used several different mp3 files from my collection. All samples were local to the Pi and I didn’t stream any files. As with any audio test like this, the result is 90% subjective. I do think that there is a small part of the test that everyone will agree to. I did not test the audio in for any board.
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