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Radial Engineering JDX-48 Reactor Guitar Amp Direct Box  

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The Radial Engineering JDX-48 is a direct box for the contemorary professional. The prevailing complaint about direct boxes for electric guitar is that they do not capture the guitar's details properl... Click To Read More About This Product

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The Radial Engineering JDX-48 is a direct box for the contemorary professional. The prevailing complaint about direct boxes for electric guitar is that they do not capture the guitar's details properly. By designing the JDX-48 to be comfortable deriving its signal from a powered signal from the head, it is far superior to DIs built into guitar heads, which typically tap the preamp output. That approach entirely misses the characteristics that power tubes and solid state power stages lend to a guitar sound.

Apart from taking the complete guitar amp signal as its sound source, the Radial JDX-48 features 100% 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. This produces a more realistic rendering than the usual resistive pad offered by other manufacturers. The signal is then processed via a carefully designed multi-stage filter to emulate the tone of a 4x12 half stack cabinet.

In use, the JDX-48 delivers greater consistency over a typical microphone as irregularities such as mic placement and varying acoustics no longer play the dominant role on stage. This is most appreciated when using in-ear monitors as the tone remains consistent from one show to the next, resulting in shorter setup times and a more comfortable audio feed for the artist.

Although originally designed for guitar, the JDX has also become a favorite on bass. The clarity and punch in the lower midrange delivers a tone that is reminiscent of an Ampeg SVT connected to an 8x10 cabinet. On guitar it sounds as if you have a Shure SM57 in front of a Marshall half-stack. This new version also offers greater power handling for 300 watt amps and extended low end for deep bass frequencies.

  • Authentic replication of your sound without the inconsistencies of miking
  • Effective 412 cabinet emulation
  • Consistent output show after show
  • I-beam super-rugged construction
  • Specifications
    Specifications are subject to change without notice.
    Audio circuit type: Discrete Class-A - Transformer Isolated
    Frequency response: Shaped for Guitar Use
    Dynamic range: 114dB
    Noise floor: -100dBu below 0dBu
    Maximum input: 120W @ 8„¦
    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: 15k„¦
    Output impedance: 2k„¦ (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: Disconnects ground inside the power supply
    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: Size: 5" x 6.25" x 2" (127 x 159 x 51mm)
    Weight: 2.80lbs (1.28 kg)
    Warranty: Radial 3-year, transferable
90 day warranty on footswitch and tubes. One year warranty on all other products.

Pro Coverage gives you added warranty protection for your new gear. Stepping in where the manufacturer's "normal wear and tear" coverage ends, our Pro Coverage program offers you upgraded coverage if your product ever fails Read More.

Pro Coverage includes
  • Accidental damage protection (new gear only)
  • Expedited repair
  • Free shipping (for returns or repairs)
  • 100% coverage for commercial use
  • Extended return period
  • Extended price protection
  • No lemon guarantee
  • Free transfer of coverage to a new owner
  • Repair costs covered for up to three years from date of purchase
  • Repair authorization-toll-free by phone or via the web
  • Customer Reviews

Review Snapshot

by PowerReviews
Radial EngineeringJDX-48 Reactor Guitar Amp Direct Box

(based on 1 review)

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Reviewed by 1 customer

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I'll never use a mic on my amp again!

By OldToneDog

from Erie, PA

About Me Professional Musician

Verified Buyer


  • Accurate tube amp tone to the console.
  • Easy To Use


    Best Uses

    • Live Sound
    • Recording

    Comments about Radial Engineering JDX-48 Reactor Guitar Amp Direct Box:

    For decades I've used an SM57 to mic my amps. The tone was good but very inconsistent due to all of the variables in play when micing an amp. The JDX simplifies the process of getting great guitar tones to the mixer far more consistently using a mic. The new phantom powered JDX just make a great product even more user friendly.

    I'd recommend this magic tone machine to all guitarists interested in getting their tone accurately delivered to the mixer.

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