MDB 600 is a passive injection box. Its main function is to convert unbalanced signals into balanced ones with which to connect, for example, an instrument to a mixer.
MDB 600 has servo-balanced inputs and outputs. The internal circuitry is designed with a hum suppressor; therefore, the integrity of the balanced signals is correct even at high levels.
MDB 600 also has an attenuator with 3 positions: 0, 20 and 40 dB and lift switch.