Audibax ADI-20A - Stereo active DI box with 48V phantom power, -15dBu pad and ground lift

Audibax ADI-20A - Stereo active DI box with 48V phantom power, -15dBu pad and ground lift

The Audibax ADI-20A is a stereo active DI box powered by 48V phantom power , designed for seamless integration into professional audio chains. It features an audio transformer for isolation and an internal switching power supply optimized to handle high digital levels without distortion . It offers 1/4″ L/R jack inputs and balanced L/R XLR outputs, with an input impedance of >>200 kΩ and an output impedance of 600 Ω , ensuring proper matching between instruments/equipment and mixers or interfaces. It includes a switchable 0/−15 dBu pad for attenuating hot signals and a Ground-Lift switch that allows you to raise the audio ground to eliminate ground loop noise without disconnecting phantom power. In a compact and robust ( blue ) form factor, the ADI-20A performs equally well live and in the studio .

Main features

• Active stereo with 48V phantom power : stable and quiet operation from the mixer or preamplifier power supply.
• Audio transformer + switched-mode power supply : high margin before saturation and noise isolation.
• Inputs/Outputs : 2 × 1/4″ Jack (L/R) → 2 × Balanced XLR (L/R).
• Impedance matching : input >>200 kΩ for instruments; output 600 Ω for long balanced lines.
• Level and noise control : 0/−15 dBu pad and Ground-Lift .
• Portable format : 128 × 87 × 46 mm , 440 g , blue finish.

Product benefits

• Clean and consistent signal : converts unbalanced outputs to balanced XLR for long runs with less interference.
• Less buzzing : Ground-Lift helps eliminate noise from ground loops without losing phantom power.
• Real versatility : ideal for keyboards, synthesizers, players, drum machines, electroacoustic instruments and DJ equipment outputs.
• Immediate control : the -15 dBu pad prevents saturation when receiving very hot signals.

Use cases

• Direct : Take two stereo channels from the stage to the console via balanced XLR through the snake.
• Study : clean injection of keyboards or modules into preamps/matrix, reducing ground noise.
• Corporate events/IGL : adapting laptops, players or tablets to professional systems.

Frequently Asked Questions

Does it need a battery or adapter? No. The ADI-20A is powered by 48V phantom power via the XLR outputs of the mixer/interface.

Can I use it in mono? Yes. You can use a single channel (L or R) as a single-channel active DI.

When do I use the -15 dBu pad? When connecting high-output sources (e.g., some keyboards or players) to avoid clipping at the DI box or mixer input.

Does the Ground-Lift cut off phantom power? No. It only lifts the audio ground, keeping the 48V phantom power operational.

Connections and signal flow

• Inputs : 2 × 1/4″ TS Jack (L/R) from instrument/equipment.
• Outputs : 2 × balanced XLR (L/R) to table/interface.
• Power supply : 48V phantom power supplied by the XLR inputs of the receiving equipment.

Project description

Audibax ADI-20A : Stereo active DI box with 48V phantom power, 1/4″ L/R jack inputs, balanced L/R XLR outputs, 0/−15 dBu pad , Ground-Lift , input impedance >>200 kΩ , output impedance 600 Ω , dimensions 128 × 87 × 46 mm , weight 440 g , blue finish.