A total of 2 reviews of this product on Reddit.
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Never heard these for myself, but they are exactly what you need and I see them advertised in Sound & Vision mags all the time. https://www.amazon.com/ZVOX-AV200-TV-Speaker-Technology/dp/B01L9D18FC
A little north of your price point, but can be found used/refurbished for <$120 on eBay though.
EDIT: You will not be able to to use something in conjunction with your soundbar to get clearer voices. If you were hoping to keep the soundbar in play, sorry – it will need to be replaced. Passive speakers (even cheap $30 Micca ones from Amazon) will need external amplification, which will incur additional costs. The one I linked above is powered and self-contained, much like your soundbar.
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I feel you’d be the perfect customer for this:
https://www.amazon.com/ZVOX-AV200-TV-Speaker-Technology/dp/B01L9D18FC
