These cables are used for loudspeakers. Active speakers are connected to an audio interface or similar, passive speakers to amplifiers. The cables differ significantly in their conductor cross-section. The larger the cross-section, the more power can be passed on to the speaker. Common sizes are 2×1.5mm, 2×2.5mm and 2x4mm. They are available as 2-pole and 4-pole cables. Speaker cables are available without and with connectors. Connectors can be e.g. Speakon, XLR or TRS jack. In addition, they are of course offered in many lengths.