Onkyo are known for having 2 seperate connections for the rear speakers. 1 set for a surround sound, channel "A", and 1 set for seperate set a speakers, channel "B". check for the second set of connections. Also, your only gonna get sound out of the rear speakers thru surround sound mode when the unit actually sends singal. The sound is determined buy what setting you have the receiver set to.
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