Palmer PBRIDGE4A | 4-Channel Active DI Box with Dual XLR & AoC Output

Palmer PBRIDGE4A  (Palmer PAL-PBRIDGE4A)

High-Performance Active DI for Clean Signal Transmission

The Palmer PBRIDGE4A is a 4-channel active DI box in a 19" rackmount format, engineered for delivering pristine instrument signal conversion in both studio and live sound environments. With active circuitry, transformer-balanced outputs, and comprehensive connectivity, this DI ensures clarity, low noise, and interference-free performance even over long cable runs.

Palmer PBRIDGE4A Competitive Differences

• 4-channel active DI with transformer-isolated, balanced XLR outputs at front and rear
• Audio-over-Cat (AoC) output for streamlined 4-channel transmission via a single Ethernet cable
• Switchable 30 dB pad for handling instrument, line, and amp-level signals
• High impedance (390 kΩ) input for optimal matching with electric instruments
• Ground lift switch to eliminate hum and ground loops
• Power LED indicator and included 9V external power supply

Palmer PBRIDGE4A Description

The PBRIDGE4A is a premium active DI solution designed for professionals needing ultra-clean signal routing for electric guitars, basses, keyboards, and synthesizers. Each of the four channels features a 6.3 mm jack input, a THRU output for amp connection, and twin transformer-balanced XLR outputs—positioned at both front and rear—for ultimate flexibility.

This DI boasts a high input impedance and active electronics, preserving tone and dynamics even from passive pickups. The switchable -30 dB pad allows it to accept high-level sources, including amp outputs, without distortion. Thanks to transformer isolation, ground loop hum and interference are eliminated.

The built-in AoC (Audio-over-Cat) output allows all four channels to be routed over a single Ethernet cable, reducing setup clutter and streamlining long-distance routing. Whether in a touring rig or permanent installation, the PBRIDGE4A delivers superior sound, rugged construction, and unmatched reliability.

PBRIDGE4A Features

• 4-channel active DI box in 19" rack format
• Dual transformer-balanced XLR outputs per channel (front and rear)
• 1/4" TS jack inputs with THRU outputs per channel
• Audio-over-Cat RJ45 output with ground lift switch
• Switchable -30 dB input pad handles high signal levels
• High input impedance (390 kΩ) ideal for electric instruments
• Power LED indicator
• External 9V power supply included

PBRIDGE4A Specifications

• Type: Active DI box
• Transformer Isolated: Yes
• Channels: 4
• Inputs: 4 x 6.3 mm (1/4") jack, unbalanced
• Outputs: 4 x XLR (front & rear), RJ45 AoC
• Input Pad: 0 dB / -30 dB
• Input Impedance: 390 kΩ
• Output Impedance: 110 Ω
• Max Input Level: +23 dBu (1 kHz), +14 dBu (20 Hz)
• Max Output Level: +19 dBu
• Frequency Response: 20 Hz – 20 kHz (±0.5 dB)
• THD + N: < 0.0026% (30 Hz), < 0.0011% (1 kHz)
• IMD (SMPTE): < 0.0021%
• SNR: 105 dB (unweighted, 22 kHz BW)
• Transformer Ratio: 1:3
• Construction: Sheet steel, 1U 19" rackmount
• Dimensions: 19" x 3.54" x 1.73" (482 x 90 x 44 mm)
• Weight: 4.32 lbs (1.96 kg)
• Operating Voltage: 9V DC (2W power consumption)
• Included Accessories: PW9V external power supply