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Hi @ElCazador24,
Welcome to the community.
Just to clarify and make sure I understand your issue correctly:
If I have anything here incorrect, please correct me.
If it is as I have determined above, have you tested any other speakers or headphones on your Xperia E4, and does the same issue occur?
try to re-pair the devices again
are you using the stock music app? have you tried using other music app?
check your audio settings, try to change clear audio+ and dynamic equalizer
is correct, only the e4 has problems with auxiliary plays well, and upgrade to the latest version of software
nolramb
hi, use the stock application with all settings, turn off throw , try other players and the problem is only with auxiliary cable plays well , the problem is bluetooth, and connect it to another Bluetooth device and does the same.
Restore to factory 3 times, reinstall the software, update all applications and there is not change