™ OWNER’S MANUAL 0 dB PAD INPUT PAD -15 dB THRU PAD INPUT THRU OFF ON INPUT MERGE POWER PAD THRU
MDB Series Direct Boxes Important Safety Instructions Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. Clean only with a dry cloth. 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.
Important Safety Instructions.........................................2 Contents............................................................................3 Features.............................................................................3 Introduction......................................................................4 How To Use This Manual..................................................4 Getting Started.................................................................4 Things To Remember.........
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. How to Use This Manual After this introduction, a getting started guide will help you get things set up fast.
Owner’s Manual Hookup Diagrams 0 dB INPUT PAD -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.
MDB Series Direct Boxes Hookup Diagrams LEFT PAD RIGHT OUTPUT GROUND LIFT 0 dB RIGHT INPUT PAD -15 dB -15 dB LEFT OUTPUT 0 dB THRU 48V MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE The MDB-2P direct box works great for musicians with stereo instruments. In this example, we connected a synthesizer to the MDB-2P left and right input jacks. The thru jacks are then connected to the keyboard amplifier’s input jacks.
1 full 2 gain treble middle bass volume channel 1 OFF ON INPUT 180° 0° OUTPUT POLARITY gain treble middle bass volume reverb master on standby TDSK input half off power 2 Owner’s Manual Hookup Diagrams -20 dB MERGE POWER PAD 0 dB THRU 48V ON OFF GROUND LIFT LOW CUT MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE Here we connected a six-string guitar to the input jack of the MDB-1A. The thru jack is then connected to an amplifer, BUT...
MDB Series Direct Boxes MDB Series DIrect Boxes: Front Panel Features 3. Pad Switch 1 3 Put this switch in the down position to reduce the input signal by 15 dB and compensate for higher output sources. This attenuation is suited for use with instruments that have active electronics or high-output pickups. 2 0 dB INPUT PAD -15 dB THRU MDB-1P Front Panel 1.
7. Low Cut Switch [MDB-1A] When on, the low-cut switch (often referred to as a high-pass filter) cuts bass frequencies below 120 Hz. 5 6 OUTPUT GROUND LIFT We recommend that you use low-cut on every microphone application except kick drum, bass guitar, or bassy synth patches. These aside, there isn’t much down there that you want to hear, and filtering it out makes the low stuff you do want much more crisp and tasty.
MDB Series Direct Boxes Appendix A: Service Information If you think your MDB Series Direct Box has a problem, please check out the following troubleshooting tips and do your best to confirm the problem. Visit the Support section of our website (www.mackie.com/support) where you will find lots of useful information such as FAQs and other documentation. You may find the answer to the problem without having to part with your MDB Series Direct Box.
MDB Series Direct Box Specifications Audio Performance Power Frequency Response 20 Hz – 20 kHz , ±0.5 dB [MDB-1A] 20 Hz – 20 kHz , ±0.2 dB [MDB-1P • MDB-2P] Signal-to-Noise Ratio 90 dB [MDB-1A] Dynamic Range Total Harmonic Distortion 130 dB [MDB-1A] 128 dB [MDB-1P • MDB-2P] 0.02% THDF @1 kHz [MDB-1A] 0.
MDB Series Direct Boxes MDB-1P Passive Direct Box Dimensions 5.8 in / 147 mm WEIGHT 0.8 lb 0.4 kg 3.4 in 86 mm 1.5 in 38 mm MDB-2P Stereo Passive Direct Box Dimensions 5.8 in / 147 mm WEIGHT 0.8 lb 0.4 kg 3.4 in 86 mm 1.5 in 38 mm MDB-1A Active Direct Box Dimensions 5.8 in / 147 mm WEIGHT 0.8 lb 0.4 kg 3.4 in 86 mm 1.
2 INPUT PHONE JACK XLR OUT 1 6 5 4 GND LIFT 3 15dB PAD THRU Owner’s Manual MDB-1P Passive Direct Box Block Diagram PHONE JACK MDB-2P Stereo Passive Direct Box Block Diagram 2 INPUT PHONE JACK XLR OUT 1 15dB PAD 4 GND LIFT 3 LEFT 6 5 THRU PHONE JACK 2 INPUT PHONE JACK 1 15dB PAD 3 2 1 GND LIFT 3 RIGHT XLR OUT THRU PHONE JACK MDB-1A Active Direct Box Block Diagram INPUT 3 PHONE JACK -20dB PAD LOW CUT ACTIVE BALANCED DRIVER PHASE 180° 2 MERGE XLR OUT 1 5 6 4 GND THRU
MDB Series Direct Boxes Limited Warranty Please keep your sales receipt in a safe place. This Limited Product Warranty (“Product Warranty”) is provided by LOUD Audio, LLC (“LOUD”) and is applicable to products purchased in the United States or Canada through a LOUD-authorized reseller or dealer. The Product Warranty will not extend to anyone other than the original purchaser of the product (hereinafter, “Customer,” “you” or “your”). For products purchased outside the U.S. or Canada, please visit www.
16220 Wood-Red Road NE Woodinville, WA 98072 • USA Phone: 425.487.4333 Toll-free: 800.898.3211 Fax: 425.487.4337 www.mackie.
