Radial Engineering JDX-48
Reactor Guitar Amplifier Direct Box


Designed to capture the dynamics and warmth of an electric guitar amplifier, the Radial Engineering JDX 48 Reactor connects between an amp head and speaker cabinet to deliver a sound that is similar to a well-placed microphone while eliminating inconsistencies.

The design of this direct box starts with its discrete class-A circuitry and a transformer-coupled "reactive load" that captures both the sound from the amp head along with the back electromagnetic impulse from the loudspeaker, which helps to produce a more realistic rendering than a typical resistive pad. The signal is then processed via a carefully designed multi-stage filter to emulate the tone of a 4x12 half stack cabinet.

The JDX 48 Reactor delivers consistent sound night after night, and will help reduce your setup time since there's no microphone to worry about finding the perfect spot for. This direct box even works great with bass players as well, as it will provide plenty of low-end punch and low mid-range tone reminiscent of an Ampeg SVT connected to an 8x10 cabinet.

Radial Engineering JDX 48 Reactor Specifications:

  • Audio circuit type: Discrete Class-A - TransformerIsolated
  • Frequency response: Shaped for guitar use
  • Dynamic range: 114dB
  • Noise floor: -100dBu below 0dBu
  • Maximum input: 120W @ 8 Ohms 
  • Maximum output: +14dBu (clip level)
  • Thermal input limit: +49 VAC (from amplifier)
  • Total harmonic distortion: <0.015% (+10dBu input @1KHz)
  • Inter-modulation distortion: 0.03% (+10dBu input @1KHz)
  • Input impedance: 15 kOhms
  • Output impedance: 2 kOhms (XLR out)
  • Bass extension: Lowers frequency response for bass guitar
  • 300 Watt amp: Increases power handling from 100W to 300W
  • 180° polarity reverse: Inverts signal polarity at the XLR output
  • Ground lift: Shunts ground via a resistive network
  • Filter: Active speaker emulation band-pass filter
  • XLR configuration: AES standard (pin-2 hot)
  • Power: 48V phantom or +15VDC/400mA adapter Included
  • Construction: 14 gauge steel chassis and outer shell
  • Finish: Durable powder coat
  • Size: 5" x 6.25" x 2" (127 mm x 159 mm x 51 mm)
  • Weight: 2.80lbs (1.28 kg)
  • Warranty: Radial 3-year, transferable
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