It’s a complaint we’ve all heard by now and maybe one you’ve vented about firsthand: voices and conversations are often too difficult to understand when watching TV. I know many people who routinely enable closed captioning — even if they’re not hard of hearing — to be sure they don’t miss anything. Many soundbars and some TVs have added various speech enhancement modes to overcome this, but if you’re stuck with shoddy built-in TV speakers, unintelligible conversation can become very aggravating. With Prime Video, Amazon has decided to do something about this dilemma at the software level. Today, the company is introducing a new Dialogue Boost mode that can be toggled on from any device that offers the streaming service. [...]