Radial Engineering J48 STEREO Premium Stereo Active DI

Radial Engineering J48 STEREO Premium Stereo Active DI


The Radial J48 Stereo is a professional active direct box that you can count on whether you’re touring stages or recording tracks for your next EP. The J48 Stereo offers two channels of input, two channels of output, and sound-shaping-at-the-source control over the same signal path that guaranteed the original J48’s spot on concert equipment riders all over the world.

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SKU: REJ48STEREO Category:
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The Radial Engineering J48 Stereo Phantom Powered Active Direct Box adapts their renowned J48 direct box for stereo or dual mono sources. It is made of durable 14-gauge steel and is at home on the stage and in the studio. Its design enables minimum distortion and a relatively neutral sound to preserve your instrument’s true tone. Work with louder sources and, if necessary, get rid of lower-frequency rumble thanks to a -15 dB pad and a configurable high-pass filter at 80 Hz.

The J48 Stereo features a switching power supply that makes use of the 48V to maximize headroom and reduce distortion. It also requires 48V phantom power. You can fix any polarity problems with a polarity reverse switch, and the ground loop helps get rid of hum.


  • Exceptional headroom & dynamic range
  • Retains the natural sound of the instrument
  • Use with stereo sources or multiple instruments
  • Powered by 48V phantom, no batteries required


  • Audio circuit type: Proprietary analog circuit with low-noise op-amp
  • Number of channels: 2
  • 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: 600Ω - XLR output
  • Equivalent Input Noise: -103dBu
  • Noise Floor: -99dB below 0dBu
  • Maximum Input: +10dBu
  • Input Connectors: 2x 1/4" in and thru
  • Output Connectors: 2x XLR
  • Construction: 14 gauge steel chassis and outer shell
  • Size (LxWxD): 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
Weight 2 lbs