Mackie MDB-2P Two-Channel Passive Stereo Direct Box DI with Ground Lift

Mackie MDB-2P: Two Channels of Clean, Isolated DI for Stereo Sources

The Mackie MDB-2P is a two-channel passive direct box that packs two independent, transformer-isolated DI channels into one rugged all-metal box - everything you need to send a stereo keyboard, a pair of instruments, or a stereo module to the console clean and hum-free. Each channel has its own -15 dB pad and ground lift, so you can treat the left and right feeds independently. For the keyboardist or engineer who is always one DI short, it is the two-in-one box that keeps the stage tidy and the mix quiet.

Two Independent Passive Channels

Where a single DI forces you to carry two boxes for a stereo rig, the MDB-2P gives you two complete passive channels side by side. Each has its own 1/4-inch input, custom-wound isolation transformer, balanced XLR output, pad, and ground lift, so the left and right sides of a stereo synth stay fully separate all the way to the board. That makes it ideal for stereo keyboards, drum machines, and modules, and just as handy when two different players each need a clean DI feed from one compact box.

Transformer Isolation on Every Channel

Each channel bridges an instrument's unbalanced, high-impedance signal down to a balanced, low-impedance output that runs long cable to front-of-house without losing high end, while the transformer galvanically isolates stage and console grounds to stop ground-loop hum before it starts. When a stubborn hum still creeps in, the per-channel ground-lift switch lifts pin 1 to kill it on that side alone, so you never have to compromise the other channel to solve a problem on one.

Per-Channel Pad and Parallel Thru

Stereo keyboards and active modules often run hot, so each channel carries a -15 dB pad that tames the level ahead of the transformer for a clean, undistorted feed. Each channel also has its own 1/4-inch parallel thru, letting a player send balanced left and right feeds to the board while still running the same signals to a stage amp or powered monitor - no splitters, no lost signal, no extra clutter on the floor.

All-Metal Build for the Road

Two channels in one box means one less thing to carry and set up, and the MDB-2P houses them in a road-tough all-metal chassis with recessed switches that resist knocks. It is passive throughout, so there is no battery to die and no adapter to misplace - it comes out of the bag and goes straight to work show after show.

Who the MDB-2P Is For

Keyboard players, playback and backing-track operators, and front-of-house engineers choose the MDB-2P when a single stereo box beats juggling two mono DIs. Whether you are sending a stereo synth to the PA, running a stereo laptop feed, or handing two instrumentalists one shared solution, this two-channel passive direct box keeps the signal clean and the stage uncluttered.