Palmer PBRIDGE4P | 4-Channel Passive DI Box with Dual XLR & AoC Output

Palmer PBRIDGE4P  (Palmer PAL-PBRIDGE4P)

Multi-Channel DI Box for Guitar, Bass, and Keyboard Signal Clarity

The Palmer PBRIDGE4P is a high-quality 4-channel passive DI box built for clean, noise-free signal conversion in professional live and studio settings. Designed in a rugged 19" rack format, it delivers exceptional sound integrity even over long cable runs, making it ideal for guitars, basses, keyboards, and other instruments.

Palmer PBRIDGE4P Competitive Differences

• 4-channel passive DI with 1/4" inputs, THRU outputs, and dual transformer-balanced XLR outputs (front & rear)
• Audio-over-Cat (AoC) output for transmitting all 4 channels via a single Cat5e or higher cable
• Galvanic transformer isolation prevents ground loop hum and ensures ultra-low noise
• Switchable 30 dB input pad handles high-level signals, including amplifier outputs
• Passive operation with no power required—ideal for maximum reliability

Palmer PBRIDGE4P Description

Built for uncompromising sound professionals, the PBRIDGE4P ensures that your instrument signals maintain clarity and integrity. Each of its four channels includes a 1/4" TS jack input, a THRU output for signal pass-through, and dual XLR outputs—front and rear—for flexible routing to mixers or recording equipment.

At the core of the unit are high-quality transformers with a 10:1 ratio that provide proper impedance matching and allow for transparent signal conversion with minimal distortion. The ground lift switch helps eliminate unwanted hum caused by ground loops, while the -30 dB pad makes it safe to connect speaker-level signals directly into the unit.

The integrated Audio-over-Cat (AoC) output allows all four channels to be routed through a single Ethernet cable, offering a neat, space-saving solution for complex setups. Whether on tour or in a fixed installation, the PBRIDGE4P offers long-lasting, passive reliability without the need for external power.

PBRIDGE4P Features

• 4-channel passive DI box in 19" rack format
• 1/4" jack input and THRU output per channel
• Dual transformer-balanced XLR outputs (front & rear)
• Audio-over-Cat (AoC) RJ45 output with ground lift
• Switchable -30 dB pad for high input levels
• Galvanic isolation prevents ground loops
• No power supply required (passive design)

PBRIDGE4P Specifications

• Type: Passive DI box
• Channels: 4
• Input Connectors: 6.3 mm (1/4") TS jack
• Output Connectors: XLR (front/rear), RJ45 (AoC)
• Input Pad: 0 dB / -30 dB
• Input Impedance: 27 kΩ
• Output Impedance: 30 Ω
• Max Input Level: +25 dBu (1 kHz), +21 dBu (20 Hz)
• Frequency Response: 20 Hz – 20 kHz (±0.1 dB)
• THD: < 0.029% (30 Hz), < 0.0006% (1 kHz)
• IMD (SMPTE): < 0.0012%
• Transformer Ratio: 1:10
• Ground Lift: Yes
• Construction: Sheet steel housing, 1U 19" rackmount
• Dimensions: 19" x 3.54" x 1.73" (482 x 90 x 44 mm)
• Weight: 4.23 lbs (1.92 kg)