Bi-wiring involves using two pairs of speaker cables between your speakers and an amplifier, where usually only one cable to each speaker would be used. If you are using speakers that are capable of being bi-wired, it may be worth considering installing the extra cables to make the most of your system's audio performance.

Below is a standard wiring diagram for 1 speaker system (tweeter, midbass and crossover). This represents just 1 channel of the total system.

Bi-wiring (diagram below) is running two wires to two separate inputs on the crossovers (the crossover needs to be bi-wirable/bi-ampable). The advantages of bi-wiring depend on who you listen to. Some believe that there is a relatively significant increase in sound quality, while others believe that the only advantage is ending up with a larger speaker wire gauge. It's one of the largest debates in audio today.

Unlike bi-wiring, bi-amping is where you actually run one channel of your amplifier to the mid and one channel to the tweeter.

The only disadvantage to this technique is the cost of another amplifier (four channels instead of two). The advantages include better efficiency from the amplifiers (they only have to produce the frequencies they are responsible for) which means that your amp runs cooler and longer, better separation of the frequencies which can mean better imaging, and better control over the separate bands of frequencies which means better frequency response and control.