Mackie MDB-1A Active Direct Box
Features
- Connect an Instrument to a Mic Input
- Converts Unbalanced to Balanced
- Converts High Impedance to Low Impedance
- 1/4" Unbalanced Input
- 1/4" Through Jack
Description
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" through 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 Through 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.
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" through jack for routing to an amplifier
- -20 dB pad prevents overloading when accepting signal from a loud source
- Ground-lift switch minimises hum
- Active design operates on phantom power
Specifications
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) | 38 x 86 x 147 mm |
Weight | 0.4 kg |
In The Box
- Mackie MDB-1A Active Direct Box
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Details
- Product: Mackie MDB-1A Active Direct Box
- Manufacturer: Mackie
- Model: MDB-1A
- SKU: MDB-1A
- RM Product #: 52030