Is Audio GD C500 unity voltage gain.

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Hi friends,
I was interesting Audio GD circuitry, this one is C500 balanced power amplifier, but I don't understand because of as seen below schematic, the voltage gain should be = 1 each side, so approximately = 1x2=2 and about 4 times in term of power.
I understand that they might not published a correct schematic.
Are Anyone of you have the correct one?

An externally hosted image should be here but it was not working when we last tested it.
 
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