For a subwoofer with an rca connector any rca cable will carry the signal.
Single rca cable for subwoofer.
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But some manufacturers add special features to an rca cable and label it subwoofer.
Rca cable for subwoofer.
The connection itself may require a few wires or a single rca cable.
If the subwoofer s line in uses rca cables and if the subwoofer out on the receiver amplifier also uses rca simply plug in using an rca cable.
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If the cable is split on one end a y cable for both right and left channels then plug in both the r and l ports on the subwoofer.
The subwoofer may be passive without any internal amplification or active with an internal amplifier included to increase the volume.