Here, you will find a large selection of subwoofer cables for connecting active subwoofers, e.g. a home theatre system. A subwoofer cable is typically a mono analogue audio cable with a strong shielding, as it is most often routed for long distances and with other cables and cannot be too sensitive to low-frequency noise.
Subwoofer cables are available both as regular andmono cables, and split cables. The split cables are typically used for subwoofers that has a stereo input, as this ensures that the amplifier circuit receives the same signal on both inputs. Normally, this also raises the volume by approx. 3 dB, although the construction of the subwoofer means that it is not necessary to use both inputs. If one of the inputs on the subwoofer is labelled LFE or mono, you can use just a regular mono subwoofer cablel
For surround or stereo amplifiers with two subwoofers/pre-outs, you can use two mono subwoofer cables (e.g. when connecting to 2 different subwoofers), or a single high-quality stereo phono cable for this purpose.
For passive subwoofers, i.e. those without integrated amplifiers, regular speaker cable, e.g tis from Supra fra Supra are used, although of a reasonable thickness, as a bass speaker requires more power than a mid-range or treble unit. The quality of the cable has an impact on how accurate the sound gets, so do not choose based only on thickness.