Mackie MDB-1P, MDB-2P, MDB-1A Users Manual
™
OWNER’S MANUAL
PAD
INPUT
0 dB
-15 dB
THRU
PAD PAD
OFF
ON
INPUT
INPUT
THRU
POWER
MERGE PAD
THRU
Important Safety Instructions
.
Read these instructions.
2.
Keep these instructions.
3.
Heed all warnings.
4.
Follow all instructions.
5.
Do not use this apparatus near water.
6.
Clean only with a dry cloth.
7.
Do not block any ventilation openings. Install in accordance
with the manufacturer’s instructions.
8.
Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers)
that produce heat.
9.
Only use attachments/accessories specified by the
MDB Series Direct Boxes
manufacturer.
10.
Refer all servicing to qualified service personnel. Servicing is
required when the apparatus has been damaged in any way, such
as power-supply cord or plug is damaged, liquid has been spilled
or objects have fallen into the apparatus, the apparatus has been
exposed to rain or moisture, does not operate normally, or has
been dropped.
11.
This apparatus shall not be exposed to dripping or splashing, and
no object filled with liquids, such as vases or beer glasses, shall
be placed on the apparatus.
12.
This device complies with Part 5 of the FCC Rules. Operation is
subject to the following two conditions: () this device may not
cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause
undesired operation.
NOTE:
This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no
guarantee that interference will not occur in a particular
installation.
If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the
equipment o and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment
and the receiver.
• Connect the equipment into an outlet on a circuit
dierent from that to which the receiver is connected.
• Consult the dealer or an experienced radio / TV
technician for help.
CAUTION:
Changes or modifications to this device not expressly
approved by LOUD Audio LLC could void the user's authority to
operate the equipment under FCC rules.
WARNING — To reduce the risk of fire or electric shock,
do not expose this apparatus to rain or moisture.
3.
This device complies with FCC radiation exposure limits set
forth for an uncontrolled environment. This device should be
installed and operated with minimum distance 20cm between
the radiator & your body.
4.
This apparatus does not exceed the Class A/Class B
(whichever is applicable) limits for radio noise emissions
from digital apparatus as set out in the radio interference
regulations of the Canadian Department of Communications.
ATTENTION
— Le présent appareil numérique n’émet pas de bruits
radioélectriques dépassant las limites applicables aux
appareils numériques de class A/de class B (selon le cas)
prescrites dans le réglement sur le brouillage radioélectrique
édicté par les ministere des communications du Canada.
5.
This device complies with Industry Canada licence-exempt RSS
standard(s).
Operation is subject to the following two conditions:
() this device may not cause interference, and
(2) this device must accept any interference, including
interference that may cause undesired operation of the device.
Le présent appareil est conforme aux CNR d’Industrie
Canada applicables aux appareils radio exempts de licence.
L’exploitation est autorisée aux deux conditions suivantes:
() l’appareil ne doit pas produire de brouillage, et
(2) l’utilisateur de l’appareil doit accepter tout brouillage
radioélectrique subi, même si le brouillage est susceptible d’en
compromettre le fonctionnement.
6.
Exposure to extremely high noise levels may cause permanent
hearing loss. Individuals vary considerably in susceptibility to
noise-induced hearing loss, but nearly everyone will lose some
hearing if exposed to suciently intense noise for a period of
time. The U.S. Government’s Occupational Safety and Health
Administration (OSHA) has specified the permissible noise
level exposures shown in the following chart.
According to OSHA, any exposure in excess of these
permissible limits could result in some hearing loss. To
ensure against potentially dangerous exposure to high sound
pressure levels, it is recommended that all persons exposed
to equipment capable of producing high sound pressure levels
use hearing protectors while the equipment is in operation.
Ear plugs or protectors in the ear canals or over the ears must
be worn when operating the equipment in order to prevent
permanent hearing loss if exposure is in excess of the limits set
forth here:
Duration, per
day in hours
8 90 Duo in small club
6 92
4 95 Subway Train
3 97
2 100 Very loud classical music
1.5 102
1 105 Ryan screaming at Troy about deadlines
0.5 110
0.25 or less 115 Loudest parts at a rock concert
Sound Level dBA,
Slow Response
Typical Example
Correct disposal of this product: This symbol indicates that this product should not be disposed of with your household waste, according to the WEEE
directive (2012/19/EU) and your national law. This product should be handed over to an authorized collection site for recycling waste electrical and
electronic equipment (EEE). Improper handling of this type of waste could have a possible negative impact on the environment and human health due
to potentially hazardous substances that are generally associated with EEE. At the same time, your cooperation in the correct disposal of this product
will contribute to the eective usage of natural resources. For more information about where you can drop o your waste equipment for recycling, please
contact your local city oce, waste authority, or your household waste disposal service.
2
MDB Series Direct Boxes
Contents
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 / O Switches ............................................8
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 Lif
• 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
Owner’s Manual
MDB Series Direct Boxes: Rear Panel Features ............9
5. XLR Output Jacks ................................................9
6. Ground Lif 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
• Perfect for stereo sources like keyboards and media
players
• High-impedance 1/4" inputs with Thru outputs
• Balanced XLR outputs with Ground Lif
• 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 oers higher headroom for ultra-low
noise and distortion-free performance
• High-impedance 1/4" input with Thru output
• Balanced XLR output with Ground Lif
• 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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Part No. SW1224 Rev. A 01/18
©2018 LOUD Audio, LLC All Rights Reserved.
Owner’s Manual
3
Introduction
MDB-1P Passive Direct Box
How to Use This Manual
Afer this introduction, a getting started guide will help you
get things set up fast. The hookup diagrams show typical
setups.
An essential tool for every musician and engineer,
the MDB-1P Passive DI has everything you need to adapt
unbalanced, high-impedance audio to a balanced,
low-impedance output with minimal noise. Featuring a 1/4"
high-impedance input and thru with -15db pad and a balanced
XLR output with ground lif.
MDB-2P Stereo Passive Direct Box
MDB Series Direct Boxes
Great for stereo sources like keyboards and synthesizers,
the MDB-2P is an essential tool for electronic musicians, live
sound venues, and recording studios. The MDB-2P Stereo
Passive DI features dual 1/4" high-impedance inputs with
Thru outputs and -15db pads, and dual low-impedance
XLR outputs with ground lif.
MDB-1A Active Direct Box
Great for active instruments like guitars and basses with
active pickups and preamps, the MDB-1A Active DI features
increased headroom and distortion-free operation.
Featuring a 1/4” high-impedance input and thru with -20db
pad plus a Merge switch that turns the Thru jack into a second
input, perfect for summing a stereo source to a mono output.
This icon marks information that is critically
important or unique to the MDB Series Direct Boxes.
For your own good, read and remember them.
There’s an illustration of a microscope, so,
of course, you’re going to get more detailed
information when you see this little guy.
There are explanations of features and practical tips listed here.
It’s a good idea to pay attention to text displayed
next to a note icon, as this icon draws
attention to certain features and functions relating
to the usage of the MDB Series Direct Boxes.
Getting Started
The following steps will help you set up your MDB Series
Direct Box quickly.
1. Turn down all level knobs on all connected gear.
2. Connect an instrument to the input jack with a /4"
instrument cable.
3. Connect a cable from the outputs of the MDB Series
Direct Box to the inputs of a mixer.
4. Connect cables from the thru to an instrument amplifier
or other source.
The balanced XLR output features switches for Polarity,
Low Cut, and Ground Lif. For maximum convenience, the
MDB-1A is powered by 48v phantom power.
5. Turn the mixer and/or amplifier on.
6. Be sure that the volume of the input is the same as it
would be during normal use.
7. Slowly bring up the level knob of the mixer to
a comfortable listening level.
Things to Remember
• Never listen to loud music for prolonged periods.
Please see the Safety Instructions on page 2 for
information on hearing protection.
• Save the shipping boxes and packing materials!
You may need them someday. Besides, your hamster
will love playing in them and jumping out at you
unexpectedly. Remember to pretend like you
are surprised!
• Save your sales receipt in a safe place.
4
MDB Series Direct Boxes
Hookup Diagrams
INPUT
PAD
Owner’s Manual
0 dB
-15 dB
THRU
48V
OUTPUT
GROUND
LIFT
MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE
The MDB-1P is a convenient direct box for musicians – especially bass players – to add to the chain.
Let’s look at the front panel connections first. Start by simply connecting your instrument to the MDB-1P
input jack. And end by simply connecting a cable from the thru jack to your amplifier’s input jack.
Front panel connections made!
The rear panel connection is as straighforward as the front panel connections. Here we connected
an XLR cable from the MDB-1P output jack to a mixer’s input jack.
That was our part. The next part is up to you... the audience is waiting!
Note: While we used a Mackie ProFX12v2 mixer in this example, you could connect the output of the MDB-1P
to the input jack of an audio interface instead. The Mackie Big Knob Studio and Studio+ come to mind!
Typical MDB-1P Setup
Owner’s Manual
5
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