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One thing to keep in mind the most important speakers are your front 3. They should all match timbre wise. You might want to try and find something that goes with the Polk audio r15 for your center channel. Like the CSi20. You could also make an improvement by selling the front R15's and getting some floor standing speakers(unless that is not an option).
A receiver could be an improvement also as I always think the lower ends Sony's sound muddy.
You could buy any of the lower end Denon, HK, Onkyo, Yamaha and I am sure it would sound better.
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