Owner
’s Manual
3
Owner’s Manual
Contents
Part No. SW1224 Rev. A 01/18
©2018 LOUD Audio, LLC All Rights Reserved.
Features
MDB-1P Passive Direct Box
• Perfect for guitars, basses, and more for stage and studio
• High-impedance 1/4" input with Thru output
• Balanced male XLR output connector with Ground Lift
• Ultra-low noise and distortion
• -15dB pad ensures distortion-free performance when
connecting to high-output sources
• Built-Like-A-Tank™ construction
MDB-2P Stereo Passive Direct Box
• Perfect for stereo sources like keyboards and media
players
• High-impedance 1/4" inputs with Thru outputs
• Balanced XLR outputs with Ground Lift
• Ultra-low noise and distortion
• -15dB pads ensure distortion-free performance when
connecting to high-output sources
• Built-Like-A-Tank™ construction
MDB-1A Active Direct Box
• Active circuitry offers higher headroom for ultra-low
noise and distortion-free performance
• High-impedance 1/4" input with Thru output
• Balanced XLR output with Ground Lift
• Low Cut and Polarity switches
• Merge switch allows connection of stereo sources which
are then summed to mono at the output, perfect for stereo
sources like keyboards and media players
• -20dB pad ensures distortion-free performance
when connecting to high-level sources
• Powered via 48v Phantom Power
• Built-Like-A-Tank™ construction
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Important Safety Instructions ........................................2
Contents ...........................................................................3
Features ............................................................................3
Introduction .....................................................................4
How To Use This Manual .................................................4
Getting Started ................................................................4
Things To Remember .......................................................4
Hookup Diagrams ............................................................5
MDB Series Direct Boxes: Front Panel Features ...........8
1. Input Jacks ............................................................8
2. Thru Jacks ............................................................8
3. Pad Switch ............................................................8
4. Merge Switch [MDB-1A] ......................................8
MBS On / Off Switches ............................................8
MDB Series Direct Boxes: Rear Panel Features ............9
5. XLR Output Jacks ................................................9
6. Ground Lift Switch ...............................................9
7. Low Cut Switch [MDB-1A] ....................................9
8. Polarity Switch [MDB-1A] ...................................9
Appendix A: Service Information .................................. 10
Appendix B: Technical Information ............................... 11
MDB Series Direct Boxes Dimensions ...................12
MDB Series Direct Boxes Block Diagram ..............13
Limited Warranty ............................................................14
