Yes, I can offer you advice on the most "affordable" center speaker of them all: none. In your previous posts you've pointed out that you'll be primarily confined to your bedroom and that your budget is very tight. In those circumstances it appears that you'll probably be listening in the "sweet spot" midway between the mains and that the "phantom" center speaker created there should sound very good. Try it at least temporarily and spend your money on other components at this time.

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Enjoy the music, not the equipment.