Mackie MDB-1A, Active Direct Box

Descriptions Mackie MDB-1A, Active Direct Box The Mackie MDB-1A features an active box which is designed to connect a single instrument such as guitar, bass or keyboard to a microphone preamp for musicians and audio engineers in recording sessions, houses of worship and live stage applications. The Mackie MDB-1A can converts a high-impedance, mic level output via its balanced XLR 3-pin jack. A 1/4" thru jack that allows simultaneous connection to an amplifier or pedalboard. The Mackie MDB-1A also has a -20 dB pad that reduces the input level to prevent distortion when using a high-gain source and the ground-lift switch inhibits hum caused by ground loops. In addition, the Mackie MDB-1A has a switches for polarity and a 120 Hz high-pass filter. The merge function of the Mackie MDB-1A allows the Thru jack to be used as a second, simultaneous input. Due to its active design, the Mackie MDB-1A can perform on a phantom power. A sturdy steel chassis enables confident use in the studio or on the road. Mackie MDB-1A Main Features Connect an instrument such as a guitar, bass, or keyboard to a microphone preamp Converts a high-impedance, unbalanced 1/4" input to a low-impedance, balanced XLR mic-level output 1/4" thru jack for routing to an amplifier -20 dB pad prevents overloading when accepting signal from a loud source Ground-lift switch minimizes hum Active design operates on phantom power Specifications Type  Active Input Connections  1 x 1/4" TS unbalanced Output Connectors  1 x 1/4" TS unbalanced 1 x XLR 3-pin balanced Input Impedance  330 kOhms unbalanced Output Impedance  150 Ohms balanced Impedance Ratio   2200:1 Pad  -20 dB High-Pass Filter  120 Hz Controls  Pad Ground-lift switch Merge Low-cut switch Polarity Frequency Response  20 Hz to 20 kHz (±0.5 dB) Signal to Noise Ratio  90 dB Dynamic Range  130 dB Total Harmonic Distortion  0.02% at 1 kHz Power Requirement  48 VDC phantom power Current  <4 mA DC Construction Material  Heavy-gauge steel chassis Dimensions (H x W x D)  1.5 x 3.4 x 5.8" / 38 x 86 x 147 mm Weight  0.8 lb / 0.4 kg