Radial J48 Stereo

Phantom Powered Stereo Active Direct Box


Radial J48 Stereo

The Radial J48 Stereo is a high-performance 2-channel 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.

  • 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

Higher voltage, higher headroom

Most battery-powered instruments and stereo keyboards will produce as much as 7 Volts when played at maximum volume, which can easily overload typical active direct boxes that are only able to handle about 3 Volts. The J48 Stereo 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. The J48 maintains stereo separation between the left and right channels, allowing it to be used on two separate instruments or with stereo sources such as keyboards.

The Radial J48 has gained a tremendous following in the professional audio community. With significantly more headroom, lower distortion, and unmatched durability, it is no wonder that the J48 has become the most specified direct box on stages around the world and there is no doubt that the J48 Stereo will follow suit. As you will note, the J48 Stereo is exceptionally linear with a frequency response that exceeds 40kHz. Just as impressive, it produces a wonderful cascade of even-order harmonics reminiscent of the finest studio equipment. Amazing signal handling, great sound, and low noise… The J48 Stereo rules!

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: -99dB below 0dBu
Maximum Input: +10dBu
Input pad, 180° polarity reverse, Ground lift, HPF
Input Connectors: 2x 1/4″ in and thru
Output Connectors: 2x XLR
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


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