A convenient and an essential PHASE switch is included to allow for proper subwoofer signal polarity to be selected.
一个既方便又一个重要阶段，包括开关，以便适当的低音信号极性被选中。
A convenient and an essential PHASE switch is included to allow for proper subwoofer signal polarity to be selected.
一个既方便又一个重要阶段，包括开关，以便适当的低音信号极性被选中。
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