Pricing and availability

We compare 600+ stores and found this item at 8 stores. Prices updated .

Sweetwater
5.0 (10)
$479.99
Guitar Center
5.0 (1)
$479.99
Amazon
4.9 (24)
$479.99 New
$383.99 Used (Like New)
Reverb
5.0 (5)
$418.12 New
$295.00 Used
Musician's Friend
5.0 (3)
$479.99
Thomann
4.9 (34)
$527.00 $522.00 $5.00 · All time low
Gear4Music
£508.00

Average Price: $454

High-end/Boutique

$119

$300+

Price Tier

Budget

Standard

High-end

Price History

Based on price data from 5 merchants for "Radial JDI Duplex". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Dive into pristine audio quality with the Radial JDI Duplex, a stereo passive direct box that's a true workhorse for musicians, audio engineers, and broadcast professionals alike. This robust DI box is your go-to for connecting a wide array of instruments and gear, delivering unparalleled sound fidelity. Equipped with two top-tier Jensen transformers, the JDI Duplex ensures your sound stays true to its source, offering immaculate signal handling without the unwanted noise, phase shift, or harmonic distortion. Whether you're smoothing out the edges of digital pianos or capturing the dynamic punch of electronic drums, its natural transformer saturation brings a warm and harmonic richness to your audio.

Crafted for the demanding environments of live stages and studios, the Radial JDI Duplex doesn't just excel in audio performance. Its innovative design includes a protective book-end structure and a rugged 14-gauge steel construction, ensuring your DI box stands up to the rigors of touring and setup changes. Ground loops and electrical interference are a thing of the past, thanks to transformer isolation and a comprehensive ground lift system. Offering a plethora of connectivity options, including ¼" connectors, RCA, and a 3.5mm TRS, this DI box integrates seamlessly with both consumer-level and professional gear, making it an indispensable tool in your audio arsenal.

Key Features:

  • Equipped with two Jensen transformers for optimal audio clarity and performance.
  • Provides exceptional signal handling with virtually zero phase shift or harmonic distortion.
  • Transformer isolation eliminates ground loops, ensuring a clean, buzz-free audio experience.
  • Versatile connectivity options, including ¼" instrument jacks, RCA connectors, and 3.5mm TRS.
  • Innovative book-end design and 14-gauge steel construction for maximum durability.
  • Full-bottom no-slip pad for mechanical and electrical isolation.
  • High common mode noise rejection for cleaner audio signals.
  • Merge function enables stereo to mono summing, ideal for limited-input live scenarios.
  • Features a -15dB pad for interfacing with high-output sources and a polarity reverse switch for phase alignment.
  • Ground lift switch provides complete electrical isolation for noise-free operation.

Owner's manual

Radial JDI Duplex User Manual

Product specs

Available since November 2006
Multi-Channel Unit Yes
Channels 2
Active / Passive Passive
19" No
Pad switchable Yes
Gnd/Lift switchable Yes
Powered by battery No
Speaker Simulation No

FAQs

What makes the Radial JDI Duplex suitable for stereo applications?

The Radial JDI Duplex is designed as a stereo direct box with two independent channels, making it ideal for applications that require stereo processing or handling multiple instruments simultaneously.

Is the Radial JDI Duplex an active or passive direct box?

The Radial JDI Duplex is a passive direct box, which means it does not require any external power source or batteries to operate.

Can the Radial JDI Duplex handle high-output instruments?

Yes, the Radial JDI Duplex features a switchable pad that allows it to handle high-output instruments without distortion, providing flexibility in various live and studio settings.

Does the Radial JDI Duplex offer ground lift functionality?

Yes, the Radial JDI Duplex includes a ground lift switch to help eliminate hum and noise caused by ground loops, ensuring a clean signal path.

Is the Radial JDI Duplex suitable for use with speaker-level signals?

The Radial JDI Duplex is not designed for speaker-level signals, as it lacks speaker simulation capabilities. It is best used with instrument and line-level signals.

Billy LaGuardia

Billy LaGuardia

Radial JDI Duplex Stereo Direct Box

Video thumbnail for Radial JDI Duplex Stereo Direct Box by Billy LaGuardia

Radial JDI Duplex Stereo Direct Box

Billy LaGuardia

Billy LaGuardia

Reviews

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Radial JDI Duplex.

Use cases and applications

  • Users explore DI boxes for adding subtle "mojo" to in-the-box setups, despite the JDI's clean design.

    Source
  • The JDI Duplex is noted for improving signal integrity and reducing noise in home studio setups, especially when handling low output instruments prone to line noise.

    Source
  • The Radial JDI Duplex is favored for reducing noise in vintage gear when recording a clean DI signal while simultaneously sending the signal to an amp for mic'd recording.

    Source
  • Acoustic instruments can benefit from high impedance Radial DIs, improving sound quality for guitars, violins, and mandolins.

    Source
  • The JDI is recommended for passive DI needs, with active pickups, while the J48 is suggested for sources with passive pickups due to its high mid texture.

    Source

Comparisons

  • While some interfaces can handle instrument inputs adequately, the Radial JDI offers a clearer and more amplified signal, particularly beneficial for bass recordings.

    Source
  • A/B tests reveal that running a bass through a Radial JDI into high-end preamps like the API 3124 yields superior sound compared to using interface preamps alone.

    Source
  • The Golden Age Pre73 is discussed as a potential alternative for adding character, though its instrument input is deemed unremarkable compared to other preamps.

    Source
  • The JDI's difference from the Pro D2 is most noticeable on quiet sources with extended high-frequency content.

    Source

User experience

  • Multiple users report that the JDI Duplex can last over two decades under full abuse conditions, indicating robust build quality.

    Source
  • Owners report that while the JDI’s transformers are clean, experimenting with output levels might still yield desirable subtle color.

    Source
  • One owner reports the Pro D2's durability, having survived being submerged in rainwater overnight without performance issues.

    Source

Features and functionality

  • The Radial JDI's -15db pad feature allows users to manage preamp levels more effectively, preventing clipping when recording high-output instruments like bass guitars.

    Source
  • The JDI Duplex uses Jensen transformers, providing a true signal representation, especially beneficial for front-of-house auxiliary uses.

    Source
  • The Radial JDI Duplex is designed to be transparent; it's challenging to achieve significant transformer saturation unless driven hard.

    Source
  • Stagebug series DI boxes are valued for their compactness, particularly when transporting multiple DIs with microphones.

    Source

Value and pricing

  • The Pro48 is favored for its price and compact size, making it suitable for users with limited space and budget constraints.

    Source

Based on 0 Reviews and 0 Ratings

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Artist usage

Add artist
See how Ed Droste uses Radial JDI Duplex

Ed Droste

Singer

Grizzly Bear

...
Verified via Photo

Ed Droste uses this with the keyboard and omnichord.

See how Tim Reynolds uses Radial JDI Duplex

Tim Reynolds

Guitarist

Dave Matthews Band

...
Verified via Dave Matthews Band
See how Stefan Lessard uses Radial JDI Duplex

Stefan Lessard

Bassist

Dave Matthews Band

...
Verified via Dave Matthews Band

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Used With

Based on how musicians on Equipboard use Radial JDI Duplex, it is most commonly used with the following gear.

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