RVH Golden and Silvery Transparent PVC Insulated Speaker Cables. The speaker cable is used to connect the power amplifier and the speaker. The current signal flowing is much larger than the video cable and the audio cable mentioned above. Because the signal amplitude is large, this kind of cable often has no shielding layer. For this kind of wire, the key is to reduce its resistance. Because the output impedance of the modern power amplifier is very low, the requirements for the speaker cable are also increased, such as selecting large cross-sectional area or multiple stranded wires.