Some MB have terrible sound as they pick up electrical noises from the power source (psu).
Having a good MB, or an external audio (getting the audio from your computer via USB) makes a bigger difference than the speakers.
i'm a big fan of so called "near-field monitors", which have a decent sound if you tend to sit in front of them.
most of them are active and there are a broad spectrum of options available ...
idk. from cheap(er) behringer, alesis, mackie to name a few or the decade-old intermediately priced "standards" from yamaha (which i'm using) to other more pricier options ...
if you want to spend some money / invest in quality combine them with a decent USB-audio solution + symmetric cables ... :))
just my 0.02€