Palmer BRIDGE 4A - active 4-channel 19" DI box If you want to safely and cleanly send a signal from a guitar, bass, keyboard, or synthesizer to a mixer, you need a solution that not only matches impedance but also reduces noise while preserving the natural character of your instrument. This active 19" rack DI box is designed exactly for that purpose. It offers four independent channels, transformer isolation, and THRU outputs for each channel, making it ideal for both stage and studio applications. It is a practical tool for musicians, sound engineers, and technicians who expect stable performance, low noise, and seamless integration into professional audio setups.

Product features This unit combines four independent active DI boxes in one solid 19" / 1U rack enclosure. Each channel features a 6.3 mm jack input, a THRU output, and balanced XLR outputs, allowing you to send the signal to a mixing console while simultaneously routing it to an amplifier or another device. Transformer isolation helps eliminate ground loop noise, while a ground lift switch for each output gives you better control over your setup. A switchable -30 dB pad ensures reliable operation with higher signal levels without unwanted distortion.

Stable signal and seamless integration in professional audio systems The key advantage of this unit is the combination of functionality and ease of use. The active circuitry provides a wide frequency response, high dynamic range, and stronger output compared to passive solutions, resulting in a cleaner and more reliable signal in sound systems. This makes it easier to preserve the detail and clarity of your instrument, even over long cable runs. Another highlight is the Audio over Cat output, which allows all four channels to be transmitted via a single Cat5e (or higher) cable. This reduces cable clutter, improves organization in your rack, and speeds up setup time. It is especially useful in environments where efficiency, reliability, and space-saving are essential. The rugged steel housing ensures durability for both mobile and installed applications. The standard 19" rack format allows easy mounting in cases and racks, while the intuitive layout of connectors ensures quick integration into existing systems. This device helps organize multiple signal sources while maintaining a professional audio workflow.

Applications This 4-channel active DI box is ideal wherever unbalanced instrument signals need to be reliably converted and sent to microphone inputs. It works perfectly with electric guitars, bass guitars, keyboards, stage pianos, and synthesizers. It is suitable for live performances, rehearsals, broadcasts, studios, and fixed installations. Having four channels in one unit is especially convenient when working with multiple instruments or when organizing stage cabling in a rack. The THRU outputs allow parallel signal routing to amplifiers, which is essential for musicians who want both FOH sound and their own stage monitoring. The input attenuation pad also expands its usability for higher-level signals, making it a flexible solution for more demanding setups.

Technical specifications Device type: active DI box Channels: 4 Inputs: 4 x 6.3 mm jack, unbalanced Outputs: 4 x XLR, parallel XLR outputs, Audio over Cat via RJ45 THRU output: 1 per channel Input attenuation: 0 dB / 30 dB Transformer isolation: yes Ground lift: yes Frequency response: 20 Hz - 20 kHz Input impedance: 390 kOhm Output impedance: 110 Ohm Max output level: +19 dBu Power supply: 9 V DC, center negative Power consumption: 2 W Housing: 19" rack / 1U Dimensions: 482 x 90 x 44 mm Weight: 1.96 kg Construction and materials The unit features a durable steel chassis designed to withstand intensive use in both touring and installation environments. The 1U rack format saves space while providing convenient access to all connections. This makes it an ideal choice for users who value durability, cable organization, and quick setup.

Included in the box The package includes the 4-channel active 19" rack DI box and an external PW9V power supply.

Summary If you need clean signal transmission, proper impedance matching, noise reduction, and efficient handling of multiple instruments, the Palmer BRIDGE 4A is an excellent choice. It is a practical solution for stage and studio use, helping you organize your signal chain, save rack space, and maintain flexibility in modern audio systems.