Mackie MDB-1P 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
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Specifications
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Type
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Passive
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Input Connections
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1 x 1/4" TS unbalanced
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Output Connectors
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1 x 1/4" TS unbalanced
1 x XLR 3-pin balanced
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Input Impedance
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140 kOhms unbalanced
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Output Impedance
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400 Ohms unbalanced
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Impedance Ratio
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350:1
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Pad
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-15 dB
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High-Pass Filter
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None
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Controls
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Pad
Ground-lift switch
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Frequency Response
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20 Hz to 20 kHz (±0.2 dB)
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Signal to Noise Ratio
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Not specified by manufacturer
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Dynamic Range
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128 dB
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Total Harmonic Distortion
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0.002% from 1 kHz
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Power Requirement
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None
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Current
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N/A
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Construction Material
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Heavy-gauge steel chassis
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Dimensions (H x W x D)
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1.5 x 3.4 x 5.8" / 38 x 86 x 147 mm
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Weight
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0.8 lb / 0.4 kg
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