@f41a9372: That's a great question! The main difference between an active DI box and a passive DI box is that an active DI box requires power to operate, while a passive DI box does not. An active DI box typically has a built-in preamp that requires power from an external source, such as a battery or phantom power from a mixing console. This preamp allows the active DI box to boost the signal level and provide additional gain, which can be helpful when dealing with weaker signals. A passive DI box, on the other hand, does not have a built-in preamp and relies solely on the transformer to convert the signal. This can result in a loss of signal level, but can also provide a more natural sound.