With a subwoofer cable, you connect a subwoofer to your receiver, amplifier, or speakers. Subwoofer cables come in various lengths. When you decide in advance where you place your subwoofer, you can be sure that you are purchasing a subwoofer cable with the correct length. Some subwoofers can be connected to your speakers, receiver, or amplifier via a double tulip connector. There are also subwoofers that you connect via a single tulip connector. The type of cable you choose depends on the device to which you connect the subwoofer.