Radial Engineering J48
Active DI for Acoustic Guitar and Bass, Extra Headroom and High-Pass Filter


The Radial Engineering J48 is a great sounding active direct box that has been optimized to produce maximum headroom while working within the limited current available from standard 48V phantom power. By employing a unique switching power supply, the J48 is capable of peak transients to 9 volts without choking. The result is lower harmonic distortion, half the inter-modulation distortion and significantly improved dynamics over other DIs.


  • Exceptional headroom & dynamic range
  • Retains the natural sound of the source instrument
  • Merge switch sums stereo instruments to mono
  • Powered by 48V phantom power, no batteries required
  • 15dB pad


  • Dynamic Range: 130 dB
  • Signal to Noise: 119 dB @ 100 Hz
  • Maximum Input: 10V
  • Frequency Range: 10 Hz - 40 kHz
  • Linearity 20 Hz - 20 kHz: 0.1 dB
  • Phase Coherence: 10º at 20 Hz, 0º at 1 kHz
  • Distortion at 20 Hz: < 0.5%
  • Input Impedance: 220k Ohms
  • Output Impedance: 600 Ohms
  • Construction: Welded steel
  • Finish: Baked enamel
  • Input Connectors: Two 1/4" phone
  • Output Connectors: XLR male

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

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