MDB1P 

Passive Direct Box

Overview

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.
Features

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

Specifications

TypePassive

Input Connections1 x 1/4" TS unbalanced

Output Connectors1 x 1/4" TS unbalanced

1 x XLR 3-pin balanced

Input Impedance140 kOhms unbalanced

Output Impedance400 Ohms unbalanced

Impedance Ratio350:1

Pad-15 dB

High-Pass FilterNone

ControlsPad

Ground-lift switch

Frequency Response20 Hz to 20 kHz (±0.2 dB)

Signal to Noise RatioNot specified by manufacturer

Dynamic Range128 dB

Total Harmonic Distortion0.002% from 1 kHz

Power RequirementNone

CurrentN/A

Construction MaterialHeavy-gauge steel chassis

Dimensions (H x W x D)1.5 x 3.4 x 5.8" / 38 x 86 x 147 mm

Weight0.8 lb / 0.4 kg

Packaging Info

Package Weight1.01 lb

Box Dimensions (LxWxH)6.95 x 5.7 x 2.85"
What’s In The Box

- MDB-1P Passive Direct Box