This decoding employs a sixth channel of audio information to deliver 6.1-channel sound through a back surround speaker or speakers. This sixth channel is encoded as a matrixed signal within the standard left and right surround channels. Your receiver must also have 6-channel power in order to drive the back surround speaker. Alternately, you can use a 5.1-channel receiver with an auxiliary amplifier or a powered speaker.


 
 



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