Mackie MDB-1P Passive Direct Box

PA SKU # MAC MDB1P MFR # MDB-1P UPC # 00663961053982
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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
  • No Power Source Required

Passive Direct Box

The Mackie MDB-1P is a passive 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 -15 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. Due to its passive design, the MDB-1P requires no batteries or power supply. 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
  • -15 dB pad prevents overloading when accepting signal from a loud source
  • Ground-lift switch minimizes hum
  • Passive design requires no batteries or power supply
  • Type: Passive
  • Input Connections: 1 x 1/4" TS unbalanced
  • Output Connectors: 1 x 1/4" TS unbalanced
  • 1 x XLR 3-pin balanced
  • Input Impedance: 140 kOhms unbalanced
  • Output Impedance: 400 Ohms unbalanced
  • Impedance Ratio: 350: 1
  • Pad: -15 dB
  • High-Pass Filter: None
  • Controls: Pad
  • Ground-lift switch
  • Frequency Response: 20 Hz to 20 kHz (±0.2 dB)
  • Signal to Noise Ratio: Not specified by manufacturer
  • Dynamic Range: 128 dB
  • Total Harmonic Distortion: 0.002% from 1 kHz
  • Power Requirement: None
  • Current: N/A
  • 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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