Increase the volume in S905X2 android 7.1.2 Nougat Version

[yossi010101]

Hi, i want to increase the volume in S905X2 in android 7.1.2 Nougat Version.
when playing video using the Miracast apk, the sound produced is not loud.
and I tried changing in part

public static int [] DEFAULT_STREAM_VOLUME = new int [] {
4, // STREAM_VOICE_CALL
15, // STREAM_SYSTEM
8, // STREAM_RING
15, // STREAM_MUSIC // change this section
8, // STREAM_ALARM
8, // STREAM_NOTIFICATION
7, // STREAM_BLUETOOTH_SCO
15, // STREAM_SYSTEM_ENFORCED
11, // STREAM_DTMF
11 // STREAM_TTS
};

there was a change, but it was not significant. how to make the sound even louder?

thanks and warm regards!