There is no such thing as a HDMI hub for adding components. The only option you have is to buy a home theater amp that has HDMI ports, like the Sony STRDH510. It has 3 HDMI inputs and one HDMI out (to go to your TV). There are other brands that have similar functionality, but you can't go wrong with this one.
Sony - 500W 5.1-Ch. A/V Home Theater Receiver
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