I listen a lot to music with my Samsung A3, and the sound is totally ok with headphones (thus no strange software effect applied to audio out), but when listening with internal speaker, I notice:
too much high frequencies (between 5khz and 20 khz), it nearly hurts the ears with high RMS-dB songs, even if I reduced the high freq as much as I could in the Music Player app's EQ
it's like some high dynamic range compression is applied to the speaker output sound (it has a very caracteristic sound) and this is not present when using headphones
All this was not present with previous phones I had.
In order to enjoy the portability of listening to music with solely the phone's internal speaker, how to improve its quality?
Are there apps that can apply EQ to internal speaker only (not 3.5mm headphone out jack) ?
Are there some effects to disable in a hidden menu (Developer menu?) of Android 5.0.2 ?
Background: I have had a few Android Samsung phones, a good old cheap Samsung Young S5360, a Galaxy Trend Lite, etc. and now a Samsung A3 (SM-A300FU) using Android 5.0.2. Music producer here.