Music / Instruments
Behringer BDI21 V-Tone Bass Driver DI Pedal User Guide
Quick guide for the Behringer BDI21 V-Tone Bass Driver DI pedal, covering control elements, connection setup, battery installation, and sample tone settings.
Table of contents
Quick guide from the manual
The Behringer BDI21 V-Tone Bass Driver is a versatile bass amp modeler and DI box. It features tube emulation, a 2-band EQ with presence control, and a dedicated drive control to shape your bass tone from vintage to modern. It can also function as a transparent DI box in bypass mode.
Control Elements
- DRIVE: Adjusts gain and overdrive, simulating a tube amp output section.
- TREBLE: Adjusts high-frequency range (±12 dB).
- BASS: Adjusts low-frequency range (±12 dB).
- PRESENCE: Boosts upper harmonic content for more attack and a smoother high end.
- LEVEL: Adjusts the overall output volume.
- BLEND: Adjusts the amount of tube emulation.
- GND LIFT: Disconnects ground between input and output to help eliminate hum or ground loops.
- Footswitch: Activates or deactivates tone functions (EQ, DRIVE, tube emulation).
Connections
- INPUT: 1/4" TS connector for your bass guitar or other instruments. Inserting a plug here powers on the unit.
- BAL OUT: Balanced XLR output for connecting to a mixing console.
- OUT: Unbalanced 1/4" TS output for connecting to a bass amplifier.
- DC IN: Connector for a 9 V power supply (not included).
Power and Battery
The BDI21 is powered automatically when a plug is inserted into the INPUT. To prolong battery life, always disconnect the input cable when the unit is not in use. The battery compartment is located on the bottom of the unit.
Sample Settings
The manual provides several starting points for different tones, including FAT TUBE, SVT STYLE, SLAP, REGGAE, and SOLO. These settings adjust the DRIVE, TREBLE, BASS, LEVEL, PRESENCE, and BLEND knobs to achieve specific sound characteristics.
Manufacturer information
Behringer
Practical help
Common problems
Hum or ground loops
Activate the GND LIFT switch to disconnect the ground connection between input and output.
Battery draining quickly
The unit is powered as soon as a plug is inserted into the INPUT. Always disconnect the input cable when the driver is not in use.
Before use
- Ensure a 9 V battery is installed or a 9 V power supply is connected.
- Use a high-quality balanced XLR cable for the BAL OUT connection.
- Disconnect the input cable when not in use to save battery life.
- Check that the polarity of the battery is correct (+ and -).
Specs in practice
- Input Impedance
- 1 MΩ, suitable for standard bass guitar pickups.
- Balanced Output Impedance
- 200 Ω, designed for connection to mixing console mic inputs.
- Power Consumption
- 25 mA, standard for 9 V battery operation.
Model compatibility
- Requires a 9 V DC regulated power supply (>50 mA, 2 mm DC jack, negative center) if not using a battery.
- Uses standard 9 V type 6LR61 batteries.
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.