Yeah I feel the same, like at home I have Lawton modded TH900 and Violectriv V200. But somehow my stock car speakers (Mazda 5, nothing fancy) just do human voices better.

I think it's hard to get over the physical limitation on size. Speakers are just bigger and do certain frequencies better. And Sub will just do bass better.

Unfortunately my work computer is in the living room so I need the isolation so a headphone is a must. Otherwise I do enjoy using speaker before the whole baby/work from home thing LOL.