The sound of headphones to speakers?


TS Rookie
Why cant the sound of headphones in gaming be replicated with speakers?????
I used to use a headset but as a carer for my wife I need to hear her so I always have my speakers on,

My game is Pubg and I have been using my headset again, and I now understand why people I play with in squads can hear what I cannot ????
you can hear foorsteps sooner rather than too late etc

I have tried two sets of logitech speakers but it just not the same , one was a pair and the other is with 5 speakers and sunwoof box thing
great sound but missing the extra you need inmodern gaming

so any techies out there help me , thanks