Radial EngineeringJ48 MK2 48V Active Direct Box


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Radial J48 Mk2

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.

J48 Features

  • 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
  • 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

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

Radial Engineering J48 MK2 48V Active Direct Box Reviews