Mackie MDB-1A, Active Direct Box

The Mackie MDB-1A is an active direct box designed to connect a single instrument such as a guitar, bass, or keyboard to a microphone preamp for musicians and audio engineers in recording sessions, houses of worship, and live stage applications. It converts a high-impedance, instrument-level signal via its 1/4" TS unbalanced input to a low-impedance, mic-level output via its balanced XLR 3-pin jack. A 1/4" thru jack allows simultaneous connection to an amplifier or pedalboard.

Product 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

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: 1.5 x 3.4 x 5.8" / 38 x 86 x 147 mm

Weight: 0.8 lb / 0.4 kg