Dialogue is quiet and effects are loud. Often this is not a volume problem.
Film sound is generally mixed for a cinema. Cinemas are quiet, have speakers in several directions, and can reproduce the full distance between very quiet and very loud. Playing the same mix at home through small speakers in a room with background noise leaves the quiet parts buried and only the loud parts intact.
In a multi-channel mix, dialogue mostly occupies the channel covering the centre of the screen, while effects and music spread across the sides and rear. Playing that through a television or laptop with two speakers folds the channels together, and sound that was spread out collapses into the centre and covers the dialogue.
Raising the volume is usually not the fix. Dialogue stays unclear while effects get louder. Checking the settings your device already has works better.
Thin televisions have no room for large speakers, so theirs are small and often aimed downward or backward. Adding a soundbar or external speakers transforms the same material. Wireless connections can lose quality to compression or drift out of sync, so if timing feels off, a wired connection is worth testing.
Some films remain hard to follow whatever you change, because performers deliberately speak quietly or the director favours location sound. Turning on subtitles is the surest fix. Using same-language subtitles is not an admission of anything; given how the sound is designed, it is close to an expected option.
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