The Mackie MDB-2P is a stereo passive direct box designed to connect two mono instruments or a single stereo instrument to microphone preamps for musicians and audio engineers in recording sessions, houses of worship, and live stage applications. It converts high-impedance, instrument-level signal via its 1/4" TS unbalanced inputs to low-impedance, mic-level outputs via balanced XLR 3-pin jacks. Two 1/4" TS thru jacks allow simultaneous connection to amplifiers or pedalboards.

With a frequency response spanning 20 Hz to 20 kHz (±0.2 dB), ultra-low total harmonic distortion (0.002% at 1 kHz), and a dynamic range of approximately 128 dB, the MDB‑2P delivers transparent fidelity suited for professional applications. Its input impedance sits around 140 kΩ, while outputs deliver a low-impedance signal around 400 Ω. The unit’s compact footprint—approximately 1.5″ × 3.4″ × 5.8″—and light weight (~0.8 lb) make it ideal for both studio and live use, offering top-tier performance in a rugged steel chassis built “like a tank.”

With a frequency response spanning 20 Hz to 20 kHz (±0.2 dB), ultra-low total harmonic distortion (0.002% at 1 kHz), and a dynamic range of approximately 128 dB, the MDB‑2P delivers transparent fidelity suited for professional applications. Its input impedance sits around 140 kΩ, while outputs deliver a low-impedance signal around 400 Ω. The unit’s compact footprint—approximately 1.5″ × 3.4″ × 5.8″—and light weight (~0.8 lb) make it ideal for both studio and live use, offering top-tier performance in a rugged steel chassis built “like a tank.”

• ✅ Route a Stereo Instrument to Mic Inputs
• ✅ Converts Unbalanced to Balanced
• ✅ Converts High Impedance to Low Impedance
• ✅ Two 1/4" Unbalanced Inputs
• ✅ Connect two mono instruments such as guitars or basses or a stereo instrument such as a keyboard to microphone preamps
• ✅ Converts high-impedance, unbalanced 1/4" TS inputs to low-impedance, balanced XLR mic-level outputs
• ✅ 1/4" thru jacks for routing to amplifiers or pedalboards
• ✅ Per-channel -15 dB pad prevents overloading when accepting signal from a loud source
• ✅ Ground-lift switch minimizes hum
• ✅ Passive design requires no batteries or power supply