A.thesubwooferisatthewrongangle.
B.thefrontandrearspeakersarereversed.
C.thepolarityofthespeakersarereversed.
D.theangleofthespeakersareincorrect.
参考答案：C
AthesubwooferisatthewrongangleBthefrontandrearspeakersare
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