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Radial Engineering
J48 MK2 48V Active Direct Box

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Item: N12-1402

Availability: In stock

J48 MK2 48V Active Direct Box
J48 MK2 48V Active Direct Box J48 MK2 48V Active Direct Box J48 MK2 48V Active Direct Box J48 MK2 48V Active Direct Box


The Radial 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 intermodulation distortion and significantly improved dynamics over other DIs.

Features include a -15dB pad, 180 degree polarity reverse, a unique merge function to mix 2 signals to mono, an 80Hz high-pass rumble filter, and ground lift. Like all Radial products, the J48 is built to handle abuse on the road and features a unique welded I-beam construction for years of trouble-free performance.


  • Active 48-Volt phantom powered direct box
  • -15dB pad
  • 180 degree polarity reverse
  • Merge function to mix 2 signals to mono
  • 80Hz high-pass rumble filter
  • Ground lift
  • Welded I-beam construction
  • Minimal power draw with high rail voltage
  • Will not choke when driven hard
  • Low intermodulation distortion

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  • Audio circuit type:  Proprietary analog circuit with low-noise op-amp
  • Frequency response:  20Hz ~ 20kHz (± 1.5dB)
  • Dynamic range:  109dB
  • Noise floor:  -99dB below 0dBu
  • Equivalent input noise:  -103dBu
  • Maximum input:  +10dBu
  • Phase deviation:  +10º at 20Hz | 0º at 1kHz | -1º at 20kHz
  • Total harmonic distortion:  0.002% @ -5dBu
  • Inter-modulation distortion:  0.003% @ -3dBu
  • Input impedance:  220kΩ - ¼" input
  • Output impedance:  600Ω - XLR output
  • Merge function:  IN and THRU jacks are summed to mono
  • Input pad:   -15dB
  • Polarity:  180º signal polarity reverse switch
  • Low-cut filter:  -3 dB @ 80Hz
  • Ground lift:  Disconnects pin-1 at XLR output
  • XLR configuration:  AES standard (pin-2 hot)
  • Power:  48V phantom - proprietary digital switching
  • Construction:  14 gauge steel chassis and outer shell, baked enamel finish
  • Size:  3.3" x 5.0" x 2" (84 x 127 x 48mm)
  • Weight:  1.55 lb (720 g)
  • FCC approval:  Complies with section 15 of the FCC Rules
  • Warranty:  Radial 3-year, transferable

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