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Radial J48 Stereo 2-Channel Active Instrument Phantom Powered Direct Box


Radial J48 Stereo 2-Channel Active Instrument Phantom Powered Direct Box


Manufacturer's Description

Phantom Powered Stereo Active Direct Box

The 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.

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 which have 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.


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