Hi! The Samsung line of soundbars feature different sound modes to optimize the audio based on the content you are listening to or watching. The HW-T550 features HDMI, Digital Optical Audio, and Bluetooth technology to connect to external devices. If you are looking for improved dialog or vocal clarity, I suggest looking into soundbar model HW-T650 featuring a center channel. This center channel is focused on improving dialog clarity and vocal performance. Check it out at the following link from Best Buy: https://www.bestbuy.com/site/samsung-hw-t650-3-1ch-soundbar-with-3d-surround-sound-2020-black/6400685.p?skuId=6400685
^Tim