Radial JDX Reactor Amplifier Direct Box



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In Stock: 1504 Fourth St, San Rafael, CA

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It is common practice for guitarists to place a microphone in front of their amp to send the amplified sound to the PA or recording system.The problem is that when the mic is very close to the speaker cone, a slight change in position will signifi cantly alter the sound. This makes getting consistent results diffi cult. This is further exacerbated by the room acoustics which vary considerably from stage to stage and bleed from other instruments entering the mic making it more diffi cult to mix. The Radial JDX Reactor solves the problem by eliminating the need for a microphone.

Unlike other guitar amp interfaces that only capture the sound from the amp head, the Radial JDX is a unique direct box that reacts to both the guitar amp head AND the speaker’s back electromagnetic fi eld to produce a more dynamic and realistic sound. A transformer coupled input provides a reactive bridge while also isolating the guitar amp from the PA system to eliminate the buzz and hum caused by ground loops. This is followed by a multistage fi lter that simulates a typical 12” speaker. The JDX features 100% discreet components using Radial’s unique class-A circuit topology for smooth even order harmonics, exceptional headroom and low noise.

By eliminating the need for a mic, the Radial JDX provides consistency with repeatable results night after night and reduces stage clutter. With today’s ever increasing use of in-ear monitors, great sound has never been so easy to achieve!


  • Reactive circuit captures the amp-speaker interaction
  • 100% discrete Class-A electronics for pure tone
  • Transformer isolation eliminates ground loop hum
  • Active analong speaker emulation for natural amp sound
  • Eliminates the variables of an on-stage mic
  • Captures the amplifier sound direct to the console
  • Mix the JDX and Mic signals together to create fat tones
  • Fast and easy way to get great sound from an amp
  • Repeatable and consistant results without mic bleed