The Mackie MDB-1A is an active DI Box designed primarily for use with high impedance and active instruments. In addition to the balanced output, there is also a Thru output for tapping the signal into the machine and a Merge switch for merging the stereo signal into a single mono output. The signal can be further adjusted with a polarity switch, a Low Cut switch for clipping low frequencies to 120 Hz or an attenuator with -20 dB attenuation. There is a built-in phantom power supply and a steel chassis.
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