Radial J48 | Active Direct Injection Box with High Pass Filter

The Radial J48 Active Direct Injection Box with High Pass Filter is the epitome of professional-grade audio performance. Engineered to deliver the most natural sound, this DI box is the preferred choice for musicians who want to retain the true character of their instruments without any added distortions or artifacts. Its advanced design, featuring 48V phantom power, ensures an exceptionally linear response that spans from 20Hz to well over 40kHz. This allows for a pristine, transparent sound quality that brings out the best in your music.

One of the standout features of the Radial J48 is its unique digital switching power supply, which raises the internal operating rail voltage for added headroom and improved signal handling. This innovation enables the J48 to outperform other direct injection boxes that cost several hundred dollars more. In addition to its exceptional sound quality, the J48 is built for durability, making it ideal for both studio and road use. Its rugged ‘book-end’ design protects switches and connectors from damage, while the internal I-beam construction eliminates stress on the PC board, ensuring years of trouble-free performance.

Whether you're an acoustic guitarist like Tommy Emmanuel, a super-star engineer like Joe Chiccarelli, or part of a legendary band like Fleetwood Mac, the Radial J48 offers the reliability and sound quality you need. With professional-grade features such as a -15dB input pad, 180-degree polarity reverse, ground lift, and an 80Hz high-pass filter, the J48 is designed to meet the demands of the most discerning audio professionals.

Key Features

• Ultra low distortion of all types
• Exceptional headroom & dynamic range
• Retains the instrument's natural sound
• Powered by 48V phantom
• -15dB input pad to manage loud signals
• 180-degree polarity reverse for feedback control
• Ground lift to reduce hum & buzz
• Merge function for mono output without phase cancellation
• 80Hz high-pass filter for resonant feedback control
• Rugged book-end design for protection

Specifications

• Audio circuit type: Proprietary analog circuit with low-noise op-amp
• Frequency response: 20Hz ~ 20kHz
• Dynamic range: 109dB
• Noise floor: -99dB below 0dBu
• Equivalent input noise: -103dBu
• Maximum input: +10dBu
• Phase deviation: +10 degrees at 20Hz | 0 degrees at 1kHz | -1 degree at 20kHz
• Total harmonic distortion: 0.002% @ -5dBu
• Inter-modulation distortion: 0.003% @ -3dBu
• Input impedance: 220k Ohm: 1/4" input
• Output impedance: 600 Ohm - XLR output

Package Contents

• Radial J48 Active Direct Injection Box
• User Manual
• Warranty Card