This is the trailer you are looking for... Star Wars: The Last Jedi

That’s a common sound mixing issue with flicks these days. Sort of the same way music is often mixed to make it seem “louder” by compressing the wave form upwards. Many films, and often trailers seem to be mixed so the sound track and sound effects are much louder than necessary to make them more exciting/impressive. Its terrible.

That said if the digitizing of video with even well mixed sound isn’t handled right. It can end up sounding that way anyway. Theatrical mix is done for very loud, complex speaker systems. You just swap that onto a format for home viewing. Or dump it as a streaming clip with limit audio capabilities. It tends not to sound very good. And even if they did it right I’ve found what you’re listening to it on can cause this too. The basic small speakers embedded in many flat screen TVs these days seem to come off that way. Some head phones I’ve used (the cheaper quality ones). Or headphones plugged into the cheap, not very good front panel audio jack on my gaming PC, regardless of how good they are.

So. Yes. It does sound that way. But we don’t know why, and its probably just a factor of the trailer or the way your watching this.

It sounded surprisingly good on my phone earlier. At the big boy computer with my schmancy head cans its definitely got the too quite vocals problem. If I had to guess they mixed the thing to sound best on mobile.