Route Four Sources with the ART Pro Audio PDB4 4-Channel Passive Rackmount DI

The PDB4 is a four-channel passive DI in a 1U rackmount format. It is ideal for connecting multiple unbalanced instrument, line, or speaker signals to balanced inputs.

• 4 Independent Channels
• 1/4-inch TS Inputs and Thru Connectors
• Transformer-Isolated Balanced XLR Outputs
• Switchable Ground Lift per Channel
• Switchable Attenuation (0 dB, -20 dB, -40 dB) per Channel
• Passive Design - No Power Required
• 1U Rackmount Enclosure

Each input signal is sent to a balanced, transformer-isolated XLR output and a parallel Thru jack, so it can simultaneously be connected to an amplifier on stage.

All channels feature a switchable ground lift to help eliminate hum, and switchable attenuation with up to 40 dB of gain reduction to handle high signal levels.

As a fully passive design, the PDB4 doesn’t require an external power source. Passive DIs are often a great match for powered sources such as synthesizers or guitars and basses with active preamps.

SPECIFICATIONS

• Active or Passive: Passive
• Inputs: 4 x 1/4-inch TS
• Outputs: 4 x XLR, 4 x 1/4-inch TS Thru
• Input Impedance: 50 kΩ
• Output Impedance: 600Ω
• Controls: Attenuator (0 dB, -20 dB, -40 dB), Ground Lift (all per channel)
• Frequency Response: 10 Hz - 50 kHz +/- 0.5 dB @ +4 dBu
• Power Requirements: N/A
• Dimensions (HWD): 1.75 x 19 x 6 inches / 4.4 cm x 48.3 cm x 15.2 cm
• Weight: 6.5 lbs / 2.95 kg

Manufacturer: Applied research technologies
Model: PDB4
SKU: I494577-N-4-WHXX
UPC: 840402019756

We are Chuck Levin's Washington Music Center

Since 1958, Chuck Levin’s Washington Music Center has been the trusted destination for musicians and audio professionals across Maryland, Virginia, and Washington, D.C. Family-owned and operated, our legendary music store delivers Everything in Music®—from instruments and recording gear to pro audio, rentals, and repair services.

Our team of musicians and industry experts lives and breathes gear, helping you build the perfect setup for your next performance, studio session, or installation. As an authorized dealer for top brands, we also offer our award-winning CHUCKSCLUSIVE line—exclusive, limited-edition instruments and collaborations recognized with the NAMM Top 100 Dealer Innovation Award for redefining what a music retail experience can be.

Chuck Levin’s isn’t just a store—it’s a community built by players, engineers, and creators who share a lifelong passion for sound. Stop by our legendary Wheaton, MD showroom or contact us anytime for expert advice, product questions, or the best possible deal on your next piece of gear.