Mackie MDB-1P, Passive Direct Box
The Mackie MDP-1P features 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 applications. The Mackie MDP-1P can 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 can allows simultaneous connection to an amplifier or pedalboard.
In addition, the Mackie MDP-1P has an A -15 dB pad that 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.
Mackie MDP-1P Main Features
- 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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