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Radial Engineering J48 Active DI – Direct Injection Box J48

J48 Active DI – Direct Injection Box

SKU: J48 Categories: , , Tags: , , , , , , , , ,


The J48 is a high performance active direct box for live concert touring and professional recording studio applications, with the ability to handle extreme transients without distortion while delivering the natural sound of your instrument.

Most battery-powered guitars and basses will produce as much as 7 Volts when played at maximum volume, which can easily overload typical active direct boxes which have are only able to handle about 3 Volts. The J48 uses a unique switching power supply that raises the internal rail voltage so it can handle up to an incredible 9 Volts, resulting in improved signal handling and greater headroom. This additional headroom significantly reduces distortion of all types, allowing the natural tone and character of the instrument to shine through.



• Exceptional headroom & dynamic range
• Retains the natural sound of the instrument
• Merge switch sums stereo instruments to mono
• Powered by 48V phantom, no batteries required



• Audio circuit type: Proprietary analog circuit with low-noise op-amp
• Frequency response: 20Hz ~ 20kHz
• Dynamic range: 109dB
• Total harmonic distortion: 0.002% @ -5dBu
• Intermodulation Distortion: 0.003% @ -3dBu
• Phase Deviation: +10º at 20Hz | 0º at 1kHz | -1º at 20kHz
• Input Impedance: 220kΩ – ¼” input
• Output Impedance: 200Ω – XLR output
• Equivalent Input Noise: -103dBu
• Noise: -99dB below 0dBu
• Maximum Input: +10dBu

• Input pad, Mono Sum, 180° polarity reverse, Ground lift, HPF
• Input Connectors: 1/4″
• Output Connectors: Balanced XLR, 1/4″ Thru

• Construction: 14 gauge steel chassis and outer shell
• Size (L x W x D): 3.3″ x 5.0″ x 2″ (84 x 127 x 48mm)
• Weight: 1.55 lb (720 g)
• Power: 48V phantom – proprietary digital switching
• Conditions: For use in dry locations only between 5°C and 40°C
• Warranty: Radial 3-year, transferable



Rackmount kits


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Weight .816 kg
Dimensions 15.9 × 10.8 × 7.6 cm