Most car and
home stereo speakers won't work because they're not shielded. They'll cause major issues with color distortion in the picture. Also, I'll bet a week's pay that 250 watts isn't the audio amp power output. Unless there's a large heat sink inside with several large output transistors, that TV is probably closer to 25 watts per channel max.
Also consider that the cabinet that houses the speakers is as important to the quality of sound as the speakers themselves. Cabinets are designed specifically for the speakers, so swapping to a better set of speakers may actually degrade the overall performance. Further, there's not a whole lot of room inside the speaker enclosures to provide the cabinet (cubic) volume necessary to produce deep bass. The speaker/cabinet combination is probably the best the designers could cram into that case.
That said, you'd have a dramatic increase in quality if you connected the audio outputs of the TV (if it has them) to the aux input of your stereo. Or better yet, a surround
sound system that allows you to turn up the center (dialogue) channel.
In the meantime, there is something you can try: The specs say that TV has a five-band graphic equalizer, turbo sound (usually just a high & low boost), and an "auto leveller". Turn off the turbo sound and auto leveller to help bring out the dialogue. Adjust the graphic EQ to slightly boost the midrange frequencies where the human voice resides
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