New audio question for a 2019 Elantra SEL

She's still plugging along pretty well, but the audio over the last year has gotten pretty muddy. I've never messed with car audio hardware before, but it sounds like the speakers need to be replaced. Anyone done this on these Elantra's? Is swapping out speakers alone good enough with the stock head unit? It's never been the best sound around, but all I want is decent, clear, not muddy sound.