MD1 Pro is a mono passive direct box that converts instrument, line, and speaker-level signals to a balanced output for long cable runs. It features Samson's STLX Mu-Metal shielded transformer, a 1/4" input with Thru, and a balanced XLR output. A 0 dB / -15 dB / -30 dB attenuation switch and a Ground Lift switch provide level matching and isolation. Housed in a 14-gauge steel chassis, no phantom power is required.