Center Channel for PolkAudio A1

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Hi everybody, I have the PolkAudio A1 speakers (https://www.polkaudio.com/en-us/product/archive/archive-built-in-speakers/rti-a1/112490.html) with Yamaha A-S201 amplifier (https://it.yamaha.com/it/products/audio_visual/hifi_components/a-s201/index.html).
Every time I listen to movies I have difficulties in hearing the voices; the music of the movie it is usually fine but the voices are generally too low.
I have been looking in PolkAudio website and I've seen the central channel speakers.

Do you know which one could I choose based on my current setup?
thanks

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