™
O W N E R ’ S M A N U A L
|
0 dB |
|
-15 dB |
|
PAD |
INPUT |
THRU |
OFF
ON POWER
MERGE |
PAD |
INPUT |
THRU |
MDB Series Direct Boxes
Important Safety Instructions
1.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 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 15 of the FCC Rules. Operation is subject to the following two conditions: (1) 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 off 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 different 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.
13.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.
14.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.
15.This device complies with Industry Canada licence-exempt RSS standard(s).
Operation is subject to the following two conditions:
(1)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:
(1)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.
16.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 sufficiently 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 |
Sound Level dBA, |
Typical Example |
day in hours |
Slow Response |
|
|
|
|
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 |
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 effective usage of natural resources. For more information about where you can drop off your waste equipment for recycling, please contact your local city office, 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 / 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 |
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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
Manual Owner’s
Owner’s Manual |
3 |
MDB Series Direct Boxes
Introduction
MDB-1P Passive Direct Box
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 lift.
MDB-2P Stereo Passive Direct Box
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 lift.
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.
The balanced XLR output features switches for Polarity, Low Cut, and Ground Lift. For maximum convenience, the MDB-1A is powered by 48v phantom power.
How to Use This Manual
After this introduction, a getting started guide will help you get things set up fast. The hookup diagrams show typical setups.
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 1/4" 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.
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
|
0 dB |
|
-15 dB |
|
PAD |
INPUT |
THRU |
OUTPUT |
GROUND |
|
LIFT |
||
|
Manual Owner’s
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 straightforward 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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