Radial J48 1-channel Active 48v Direct Box
Radial J48 1-channel Active 48v Direct Box

Radial J48 1-channel Active 48v Direct Box

The J48 is a high performance 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.


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  • Welded I-beam construction makes it impossible to torque the PC board. This virtually eliminates cold solder joints - the No.1 cause of system failure in the field.
  • An innovative 'slide-in-place' XLR trace makes it possible to use I-Beam girder construction.
  • A digital switching power supply steps-up the internal rail voltage to 9-Volts. The J48 will not choke like other DI's when hit with large transients.
  • A military-grade PC board is employed for maximum wear and tear in abusive environments. Welded steel standoffs ensure the PC board will not shift.
  • A -15dB pad allows super hot inputs such as that from a CD player to be connected and balanced for long runs.
  • Momentary 48V Check LED will flash once when the 80Hz filter is depressed to tell you phantom power is present.
  • The Merge function turns the input & thru into 'left & right' inputs to mono mix at the XLR output. This handy function saves valuable inputs on the mixer!
  • The input is connected to the instrument.
  • The thru-put is connected to the instrument amplifier. The J48 has a high input impedance to reduce loading.
  • Our book-end design creates a protective zone around the switches & connectors for best protection!
  • A heavy-duty baked enamel finish for excellent durability and great looks for years! 100% 14-gauge steel construction.
  • The 600 Ohm balanced XLR out is mic level to properly match concert splitters - will drive 1000 feet without appreciable noise.
  • A polarity reverse switch flips the polarity from the AES standard Pin-2 to Pin-3 on the XLR and is used when combining sounds that may be out of phase.
  • An 80Hz low-cut (highpass) filter gently reduces excessive bass for more headroom and clarity. Eliminates run-away resonant feedback from acoustics!
  • The ground-lift disconnects the ground path to the transformer at the XLR output. This is used when a ground path is made at the input side such as with a keyboard.
  • A no-slip full bottom pad reduces mechanical vibration, improves electrical isolation and keeps the J48 from moving around on busy stages!
Technical Specifications
  • Type:Active DI
  • Channels:1
  • Pads:-15dB
  • Polarity Switch:Yes
  • Ground Lift:Yes
  • Inputs:1 x 1/4"
  • Outputs:1 x XLR, 1 x 1/4" thru
  • Power Source:48V Phantom Power
  • Height:2"
  • Depth:5"
  • Width:3.3"
  • Weight:1.55 lbs.