I switched to a Samsung Galaxy Note 3 a few months ago and have since been generally pleased with my sound quality through my headphones. However, and I noticed this on my last phone too, the overall volume seems to be quieter and some of the levels are really weird such that vocals are muffled/quiet compared to backing instrumentals. This only seems to be a problem on my phone, and is less of an issue on the Note 3 compared to my old phone.
Additionally, the volume of my tracks tends to be much quieter on my phone compared to using the same headphones on my laptop. When riding the bus/train I have to turn the volume up quiet a bit and even then it sounds very empty/flat compared to my laptop/desktop spotify app.
Finally, I experimented for the first time syncing some local files onto my phone and the quality/volume/mix on those tracks is appreciablly better compared to the downloaded tracks. I have download quality set to "Extreme" and I've turned the equalizer "off" but I just can't get the same quality/volume out of my downloaded tracks. These same tracks on the desktop app have no volume/quality difference that I can percieve.
TLDNR: "Local" tracks synced to my phone are (1) louder, (2) more dynamic, and (3) better quality overal compared to "Extreme Quality" downloaded tracks. By comparison, downloaded tracks sound (1) quiet, (2) flat, and (3) lack bass tones. Using the same headphones on the desktop app there is no perceivable difference between local and downloaded content. Spotify EQ is off and no other EQ is running (that I know of).
Samsung Galaxy Note 3
Android Version 4.3 Jelly Bean
Spotify Version 0.7.6.357
Headphones - Bose AE2
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