Direct Box DBX dB12 active stereo DI box with ground lift and pad

The DBX dB12 active stereo DI box converts unbalanced instrument or line-level stereo signals into balanced microphone-level outputs for mixing consoles and recorders. Designed by DBX for both live sound and studio environments, the unit provides stereo inputs and outputs, an internal active circuit to preserve signal integrity, a ground lift switch to minimize hum caused by ground loops, and a pad to attenuate hot signals. The compact housing and clear front-panel controls make it suitable for stage setups and rack or table-top use where clean, balanced audio is required.

Advantages

The active circuitry maintains signal fidelity and frequency response across a wide dynamic range, while the stereo path preserves left/right separation without the need for two separate DI boxes. The ground lift switch helps eliminate hum from grounding issues, and the pad protects downstream inputs from clipping when connecting high-output instruments or line sources. A rugged build and straightforward controls reduce setup time and improve reliability in repeated live or studio applications.

Suitable for

• Connecting stereo keyboards and electronic instruments to a mixing console or audio interface
• Sending stereo outputs from effects units or multichannel playback devices to front-of-house
• Recording stereo sources while preserving channel separation and reducing noise
• Live performance setups that require ground-lift capability to eliminate hum

Key specifications

• Active direct box with stereo inputs and balanced XLR outputs
• Ground lift switch to interrupt ground loop paths
• Level attenuation (pad) for handling hot signals
• Compact, rugged enclosure suitable for stage and studio use
• Preserved stereo separation through the signal path

How to use

Connect the stereo outputs of your instrument, keyboard, or playback device to the DBX dB12 inputs using appropriate cables. Use balanced XLR outputs to feed the mixing console or audio interface. If you encounter hum or noise from grounding differences, engage the ground lift switch to break the ground loop. If the signal is too hot and causes clipping on the mixer input, engage the pad to attenuate the level. Monitor the signal at the console and adjust source or console gain as needed to achieve optimal levels without distortion.

Usage recommendations

For consistent low-noise results, use quality shielded cables and match levels between the source and the mixing console. Engage the ground lift only when necessary, and switch the pad in when connecting high-output keyboards or line-level processors. Regularly inspect connectors and cable integrity to maintain reliable performance in both live and studio settings.