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Yes, a subwoofer typically needs a receiver to function properly. The receiver serves as the central hub of a home theater system, processing and directing signals to the appropriate speakers. In the case of a subwoofer, the receiver sends the low- frequency signals to the subwoofer while the higher frequency signals are sent to the main speakers. If the subwoofer has its own amplifier, then an additional receiver may not be necessary. In this case, the subwoofer would connect directly to the amplifier, bypassing the need for a receiver.