Another way to keep tweaking is the equalizer that is available on almost every TV model. Use TV remote to get into audio options, and look for advanced or expert audio settings. You will most likely land on the equalizer mode.
In order to amplify audio, you should lower specifically the base bar from equalizer settings — it will enhance audio for sure. You can also lower down all music bars other than audio (just a bit down) — so that just the audio bar will be higher than others to deliver maximum clarity in dialogues
Smart Sound Menu >Sound >Sound Mode >On
Volume Mode Menu >Sound >Volume Mode >Off
Sound Optimizer Menu >Sound >Sound Optimizer >On
Sound Mode Menu >Sound >Sound Mode >Standard
Clear Voice Menu >Sound >Sound Effects >Clear Vice >ON (if applicable)
Virtual Surround Menu >Sound >Sound Effects >Virtual Surround Plus >Off
3D Sound Zooming Menu >Sound >Sound Effects >3d Sound Zooming >Off
Dolby, DTS:X Menu >Sound >Sound Effects >OFF
Balance Menu >Sound >Sound Effects >Balance >0
AV Sync Adjust Menu >Sound >AV Sync Adjust >Off