Which type of wiring is commonly used to connect speakers to an audio source?

Stranded two-wire wiring is the standard choice for connecting speakers to an audio source primarily due to its flexibility and ease of handling. This type of wire consists of multiple strands of wire twisted together, which makes it more pliable and easier to route through tight spaces or around corners compared to solid core wire. It also reduces the risk of breaking when bent or flexed during installation.

Additionally, stranded wire has excellent conductivity and provides adequate performance for typical audio frequencies. The structure of stranded wire allows for better sound quality transfer over regular lengths typically used in home or vehicle audio setups.

In contrast, solid core wire, while it may offer better conductivity over long distances, is more prone to breakage at connection points due to its rigidity. Coaxial cable, commonly used for video and RF signals, is not suitable for speaker connections as it is designed for different electrical characteristics. Fiber optic cable is used for transmitting data through light signals, making it inappropriate for standard audio applications where electrical signals are needed.