The Direct Injection Boxes selected by Audio Effetti are specially designed to convert unbalanced signals from musical instruments into balanced signals. They help to maintain a signal level and integrity from musical instruments, particularly over long cable runs. [site name] offers a variety of D.I. Boxes, from the most affordable models to highly professional units, to obtain the best from your musical instrument. In the catalog you can find active D.I. boxes and passive models using transformers, all with useful features such as ground lifts and splitting.