Art Pro Audio PDB Passive DI Box

The Art Pro Audio PDB is a single-channel passive direct box designed to convert unbalanced instrument, line, or speaker-level signals into balanced, low-impedance outputs for mixers, PA systems, and audio interfaces. Its transformer-isolated design eliminates the need for external power, making it a practical choice for active instruments, synthesizers, and pedalboards. The 50 kΩ input impedance preserves signal integrity, while the parallel 1/4" thru connector allows simultaneous connection to an amplifier on stage.

Switchable attenuation provides three gain settings, 0 dB, -20 dB, and -40 dB, accommodating everything from guitar pickups to hot line-level sources without distortion. The transformer delivers a frequency response of 10 Hz to 50 kHz with just ±0.5 dB variance at +4 dBu, ensuring transparent signal transfer across the entire audio spectrum. A ground lift switch tackles hum and noise caused by ground loops, common in multi-device stage and studio rigs. The rugged steel enclosure measures 7.6 cm × 12.7 cm × 5.1 cm and handles the rigours of touring and permanent installation.

Features

• Fully passive transformer design requiring no phantom power or batteries
• 50 kΩ input impedance and 600 Ω output impedance for optimal matching
• Switchable attenuation offering 0 dB, -20 dB, or -40 dB gain reduction
• Frequency response of 10 Hz to 50 kHz ±0.5 dB at +4 dBu
• Transformer-isolated XLR output eliminates ground loops and electromagnetic interference
• 1/4" TS thru jack enables simultaneous connection to stage amplifier
• Switchable ground lift eliminates hum in complex signal chains
• Compact steel case measuring 7.6 cm × 12.7 cm × 5.1 cm