Radial (R800 3001) Direct Box - Active

With 48V phantom power

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The choice of engineers around the world

Radial’s J48 active DI is the choice of engineers around the world! The J48’s unique phantom powered DC-to-DC transformer isolated switching power supply provides amazing headroom while eliminating ground loops, hum and buzz. The Jensen® transformer-equipped JDI from Radial handles high-output, active instruments with a musicality that audio engineers love! The welded I-beam construction insures that this direct box will stand the abuse the road can throw at it. 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.


  • Active 48-Volt phantom powered direct box
  • Minimal power draw with high rail voltage
  • Will not choke when driven hard
  • Low inter-modulation distortion

Specifications for the Radial (R800 3001) Direct Box

{ "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:" : "+10° at 20Hz

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