Z Direct pro passive direct box

A passive direct box is a device that allows you to connect an instrument with a high-impedance output, such as an electric guitar or bass, to a mixing console or PA system that expects a low-impedance balanced microphone signal. It essentially acts as a signal conditioner, matching the impedance of your instrument to the impedance of the mixer and converting the unbalanced signal to a balanced one. This helps to prevent signal loss and unwanted noise interference over long cable runs.
Passive DI boxes don't require any external power source to function, as they use a transformer to achieve impedance matching and signal balancing. This makes them a simple and convenient option for many applications. However, they may not be suitable for instruments with particularly weak pickups or for very long cable runs, as they can't boost the signal level.