DI INJECTION BOX With the bus powered MDB-USB Stereo DI, the days of relying on your headphone jack for audio from a computer on analog gear are over. By combining a high-resolution audio interface with a distortion-free and noise-free stereo DI, MDB-USB turns your digital audio into a clean and balanced stereo output. With output level control, headphone output and mono sum for maximum versatility. Analog outputs are dual XLR with ground lift.