Most, but not all, subwoofers have these inputs; they get connected using speaker cables to the same speaker output jacks on your receiver or amplifier that are also hooked up to your speakers.
That means you have to double up the connections on the receiver or amplifier (see photo below that illustrates that connection method).
So adding a sub is not just about adding more and deeper bass; rather, a properly integrated subwoofer can improve the overall sound of the system.
Subwoofer connection to a two-channel system differs from the methods used in home theaters.
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