Should I buy a soundbar for better dialogue?

Yes—if your TV dialogue sounds muffled or gets buried under music/effects, a soundbar is usually worth buying. The best choice for dialogue is a soundbar with a dedicated center channel, clear “voice” or “dialogue enhancement” mode, and preferably adjustable center-channel volume.

Best path:

1. Try free fixes first: turn off heavy surround/virtual sound modes, enable “Clear Voice”/“Dialogue” if your TV has it, and reduce bass if available.
2. If that doesn’t solve it, buy at least a 3.1-channel soundbar. The center channel is the key feature because dialogue is usually mixed to the center.
3. If you want a premium all-in-one home theater upgrade, the Samsung HW-Q990F is a strong high-end pick for dialogue and immersive sound, but it is likely more than you need if speech clarity is your only goal.

I would not buy a tiny 2.0 soundbar just for dialogue unless space or budget is the main constraint—it may be louder than the TV, but it often won’t separate voices as well as a 3.1+ model.