what are you using to test the center speaker? if it is an mp3 file then the center wont work u will need to use the emulation button(on my logitechs it is called matrix and its on the center) also if that isnt it do u have bass? because the center and bass are on the same plug and the center/subwoofer(the orange slot)is a different kind of jack than the green and black so that may be why ur getting lower signals
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