Behringer DI20P DI box

Passive Stereo DI Box for Clean, Power-Free Signal Transfer

The Behringer DI20P is a passive stereo direct injection box built for live sound, studio recording, and instrument rigs where unbalanced signals need to reach a balanced mixing console. Two unbalanced 6.3 mm TS inputs feed two balanced XLR outputs, with parallel Thru connections for routing to amps or monitors at the same time. Because the circuitry is fully passive, this unit needs no battery, no external power supply, and no phantom power — it works the moment cables are plugged in. The DI20P is the right tool for keyboard players, electronic drummers, and AV technicians who need a compact, reliable way to feed stereo sources into a professional console.

What Sets This DI Box Apart

At the heart of the unit sits a custom-built MIDAS transformer, the same family of transformer design used in high-end live consoles. The fully transformer-isolated topology creates electrical separation between input and output grounds, breaking ground loops in complex rigs. A switchable -15 dB input pad and a dedicated Earth Lift switch give the operator practical control over level matching and hum suppression without any menu diving.

Input Configuration and Level Handling

The DI20P accepts two unbalanced sources at once, well suited to stereo keyboards, stereo playback devices, or two separate mono instruments running into one console channel strip.

• Inputs: 2 x 6.3 mm TS unbalanced — stereo or dual-mono source connection
• Input Impedance: 500 kΩ (PAD off) / 10 kΩ (PAD on) — high impedance preserves instrument tone
• Input Pad: -15 dB switchable — adapts to guitar, line, and speaker-level sources
• Maximum Input Level reaches 30 dBu at 1 kHz, handling hot signals without clipping

Output Stage and Signal Quality

Balanced XLR outputs feed the mixing desk or audio interface, with low output impedance that drives long cable runs without signal loss or hum pickup.

• Outputs: 2 x balanced XLR — plus parallel 6.3 mm TS Thru jacks for local monitoring
• Output Impedance: 150 Ω at 1 kHz — stable driving of long balanced cable runs
• Maximum Output Level: 8.5 dBu at 1 kHz — clean headroom into typical console inputs
• Frequency Response spans 20 Hz – 30 kHz (±1 dB) for full-range transparency from sub-bass to air

Build Quality and Physical Specs

The enclosure uses a thick aluminium extrusion with protective rubber corners to absorb knocks during transport between stages, studios, and rehearsal rooms.

• Transformer: custom-built MIDAS — fully transformer-isolated signal path breaks ground loops
• THD + N: 0.01 % at 1 kHz, 0 dBu
• Signal-to-Noise Ratio: 108 dB — quiet floor for studio and broadcast use
• Dimensions: 118 x 112 x 64 mm — compact footprint fits any rig
• Weight: 0.54 kg — light enough for fly-in rigs and mobile setups