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I have a sharp tv what wires do I need to hook up a magnavox soundbar

If both have HDMI that should be the first option. Second, Optical (TosLink) connections, last RCA/Stereo.

It will help to know model numbers of both TV and sound bar since there are plenty Sharp TVs and half a dozen Magnavox sound bars with different audio connections (Optical, Stereo, RCA, HDMI, etc).
 
You should use the Optical connection, which can pass higher quality multi-channel audio, like Dolby Digital.
 
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