Radial Engineering J48 MK2 & X-Amp Reamp Kit w/ Case

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Radial Engineering J48 mk2 & X-Amp Kit

This bundle contains Radial Engineering's J48 mk2 and X-Amp re-amper.

J48 mk2

The J48 mk2, from Radial Engineering, is an active direct box specifically engineered to afford ample headroom despite operating within the current constraints imposed by 48V Phantom Power. The unit contains a switching power supply that enables peak transients of up to 9V and subsequently produces a low range harmonic distortion, improved dynamics, and half the intermodulation distortion of other DI boxes.

The J48 mk2 features a -15dB pad, a merge function that mixes two signals into a single mono signal,180 degree polarity reverse, and ground lift. If all that wasn’t enough, the unit is housed inside a sturdy chassis that affords ample protection in the studio, on the stage, and everywhere in-between.


The X-Amp Active Reamplifier, from Radial Engineering, is a flexible and inherently creative device that takes a prerecorded track from a line-level unit and uses it to drive up to two guitar amplifiers or two effects pedals at the same time. To do this, the unit utilizes a custom Class-A circuit that is especially suited for use with guitars. One can record a track via high quality direct box, then route this track to the X-amp before sending it to their effects pedals, guitar amp, or any combination of the two.

In the studio, the X-amp can be implemented in several ways. Once the bare bones of a track have been recorded, users can replace or add tracks any time they want, with or without the session player. This effectively negates any lag time that could potentially result in frustrating repetitiveness and promotes a robust, potent performance for the master recording. Additionally, since the unit can drive two amps at once, the creation of new sounds and textures becomes extremely simple. This affords engineers and artists an ample amount of space for artistic freedom.

The X-Amp benefits from the implementation of Class-A circuit topology, which enables robust frequency response, and 180 degree polarity reverse that ensures both amps stay in phase. There are also direct and isolated guitar amplifier outputs, as well as dual ground lift options that ensure noise-free operation.

J48 mk2 & X-Amp Kit Features


  • 100% Class-A circuit yields amazing clarity
  • Overload LED helps monitor input levels
  • Dual outputs drive two amps or pedal chains
  • Polarity reverse corrects phase between amps
  • Out-2 is transformer-isolated to eliminate ground loops
  • Active level control to set perfect levels for your amp


  • Line-level to instrument level conversion
  • Interfaces recording gear with amps & pedals
  • Re-amp your way to fat sounding tracks
  • Use during basic tracks, over-dubs and mixing

Bonus Features

  • Active design reproduces original performance
  • Tweak amp and pedal sound AFTER recording
  • Reduces player fatigue and repetition
  • Amplify acoustic instrument without feedback
  • Run 2 amps without hum or buzz

Re-amping with X Amp is fun and allows engineers to perfect guitar tracks with options not possible during a typical fast ’n furious tracking session. The X Amp makes the re-amping process easy and it’s ultra-high audio quality yields excellent results.  


  • Superior dynamic headroom
  • High input impedance reduces loading
  • Merge switch sums stereo instruments to mono
  • Low-cut filter, -15 dB PAD, and polarity reverse


  • Provides extra reach and air in your sound!
  • Ideal for active acoustic guitars and basses
  • Great for keyboards and drum modules
  • Equally wonderful for live or studio

Bonus Features

  • Huge 9-Volt internal rail voltage for extra headroom
  • Handles loud transients without choking or clipping
  • No batteries required, works with phantom-power
  • 3 year transferable warranty
  • Because the J48 has more horse-power (current to work with), it is able to handle these transients without choking. This extra headroom significantly reduces harmonic, phase and inter-modulation distortion. And when you fix all of the problems, a funny thing occurs... you get great sound!

X-Amp Specifications

  • Input level: +4dB balanced line level
  • Input impedance: 600 Ohms
  • Output impedance: 5kOhms
  • Output 1: Direct
  • Output 2: Transformer isolated
  • Output Level: Variable
  • Dynamic Range: > 100dB
  • Power Requirement: Custom 15 volt supply
  • Size: 3.5 wide, 2 high, 5.5 inches deep
  • Weight: 1 kg or 2 lbs
  • Warranty: 3 Years

J48 MK2 Direct Box Specifications

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

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

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