MACKIE MDB-USB - Stereo USB DI box

MACKIE MDB-USB – Stereo USB DI box

The Mackie MDB-USB is a USB bus-powered stereo active DI that combines a high-resolution (24-bit/96 kHz) audio interface with noise- and distortion-free balanced DI outputs. It converts your computer’s digital audio into a clean, balanced analog signal, offering a rotary level control, a headphone output for monitoring, and a mono summing switch for maximum versatility. Its analog outputs are two balanced XLRs with ground lift, and it features “Built-Like-A-Tank™” metal construction for heavy-duty use.

Main features

• USB Interface: Bus-powered USB 2.0 Type B, plug-and-play without drivers.
• Resolution: 24 bit / 96 kHz.
• Analog outputs: 2 × balanced XLR, low impedance (600 Ω) with Ground Lift.
• Headphone output: 1/8″ TRS jack (150 Ω) with independent level control.
• Level Control: Rotary potentiometer that adjusts the XLR and headphone outputs.
• Mono Switch: Sums L+R to mono for phase and compatibility testing.
• Frequency response: 20 Hz – 20 kHz ±0.5 dB.
• Total harmonic distortion: < 0.01 %.
• Dynamic range: 88 dB.
• Stereo separation: < –78 dB.
• Construction: Rugged “Built-Like-A-Tank™” metal chassis.
• Power: USB bus powered (90 mA).

User benefits

• Clean Audio: Noise- and distortion-free DI outputs for connecting to mixers or PAs without latency.
• Integrated monitoring: Headphone output and level control for adjusting audio in real time.
• Versatility: Mono switch for phase checking and mix compatibility.
• Full compatibility: Plug-and-play on Windows and macOS without the need to install drivers.
• Portability: Compact and USB powered, ideal for studio, live, or mobile streaming.

Use cases

• Injection of computer audio into analog PA systems and studio monitors.
• Streaming and podcasting with balanced signal and headphone monitoring.
• Phase and mono compatibility testing in mixing and mastering environments.
• USB audio interface for lightweight multitrack recording on location.

Frequently Asked Questions

• Does it need additional power? No; it's fully powered by USB (90 mA).
• Does it require driver installation? No; it's plug-and-play on Windows and macOS.
• How do I activate ground lift? Using the rear Ground Lift switch on each XLR.
• Can I convert to mono? Yes; the Mono switch instantly sums the L+R signals.

Description for projects

Mackie MDB-USB DI Box: 24-bit/96 kHz USB interface, 2 balanced XLRs with Ground Lift, headphone output, level control, mono sum, 20 Hz-20 kHz, THD < 0.01%, metal chassis. Bus-powered.