Comes with all interconnection cables, including 30 feet of studio grade RCA audio cable for free! Built in ground loop isolation - why it matters! The INport doesn't just give you awesome fidelity, it also includes a built in ground loop isolator to prevent annoying ground loops. A ground loop occurs through differences in resistance in your home or apartment electrical wiring. When a computer or audio component is connected to your stereo, a path is provided for electricity to flow from one wall socket to another as the electrical system tries to balance itself. This can introduce a background hum into your recordings.