Mackie MDB-1A Active Direct Box

PA SKU # MAC MDB1A MFR # MDB-1A UPC # 00663961054002
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  • Product Highlights
  • Connect an Instrument to a Mic Input
  • Converts Unbalanced to Balanced
  • Converts High Impedance to Low Impedance
  • 1/4" Unbalanced Input
  • 1/4" Thru Jack
  • XLR Balanced Output
  • Switchable Pad Prevents Overloading
  • Ground-Lift Switch Minimizes Hum
  • Merge, Low-Cut, & Polarity Switches
  • Operates on Phantom Power

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.

A -20 dB pad reduces the input level to prevent distortion when using a high-gain source, and the ground-lift switch inhibits hum caused by ground loops. Additionally, there are switches for polarity and a 120 Hz high-pass filter. The Merge function allows the Thru jack to be used as a second, simultaneous input. Due to its active design, the MDB-1A operates on phantom power. A sturdy steel chassis enables confident use in the studio or on the road.

  • 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
  • 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
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