Pricing and availability
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Price
Average Price: $248
Standard/Professional
$119
$300+
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Budget
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Price History
Based on price data from 7 merchants for "Radial Engineering JDI Passive Direct Box MK3". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
The Radial Engineering JDI Passive Direct Box MK3 is the ultimate solution for musicians seeking clean, undistorted sound. Engineered with a Jensen transformer, this DI box offers unparalleled signal integrity and noise reduction, making it a staple for both studio recording and live performances. Its passive design means no need for phantom power, eliminating the risk of ground loops and ensuring consistent, high-quality audio. With the ability to handle high-output signals, the JDI MK3 is perfect for active instruments and AC-powered equipment, delivering that coveted warm, vintage tone without the harshness of digital clipping.
Built to withstand the rigors of touring, the JDI MK3 boasts a rugged steel chassis with a unique book-end design that protects its switches and connectors from accidental damage. The non-slip rubberized pad ensures stability on any surface, while the welded I-beam construction prevents internal stress, virtually eliminating the chance of cold solder joints. Whether you're plugging in a bass, guitar, or keyboard, the JDI offers versatile connectivity options, including a merge function for stereo-to-mono summing, making it ideal for any setup.
Key Features:
- 100% passive design with Jensen transformer
- Dual function inputs with merge capability
- XLR output and 1/4" thru connection
- Switchable -15dB and -30dB pads
- Ground lift and polarity reverse switches
- Speaker emulation filter for authentic cab sound
- Durable steel chassis with protective book-end design
- Non-slip bottom pad for stability and isolation
Owner's manual
Radial Engineering JDI Passive Direct Box MK3 User ManualVideos
Reverb
Radial Engineering JDI Passive Direct Box | Reverb Demo Video
Radial Engineering JDI Passive Direct Box | Reverb Demo Video
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Reviews
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Radial Engineering JDI Passive Direct Box MK3.
Comparisons
Build quality
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The JDI is noted for its robust construction, with users mentioning its durability even when thrown onto concrete.
Source
Use cases and applications
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The JDI can handle +21 dBu without significant distortion, making it suitable for high output instruments like keyboards and active bass guitars.
Source
Critic Reviews
5.0 out of 5
Based on 0 Reviews and 6 Ratings
Artist usage
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At 18:00 in this video Will Lee shows his JDI passive direct box by Radial, stating that it's "indispensable".
Featured in this September 15, 2016 Produce Like A Pro interview at 1:17:22.
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In this Instagram post, Garrett's board shows a Radial JDI direct Box on his board.
Kyle Konkiel has used the Radial Engineering JDI Passive Direct Box MK3 for live performances, as highlighted in a feature on Blabbermouth.net.
At 2:01 minute mark, the Radial JDI direct box is visible on top of Ross' organ.
In an Instagram post, Alan Robert acknowledges Radial Engineering among the companies supporting him on tour with Life of Agony.
In this YouTube video at 11:05 Otto Schimmelpenninck can be see using this pedal.
At 16:14 in the Premier Guitar video titled "Bill Murray & His Blood Brothers with Mike Zito, Albert Castiglia & Jimmy Vivino," a Radial Engineering JDI Passive Direct Box MK3 is visible near Albert Castiglia's pedalboard.
According to Mark Egan's official website, the Radial Engineering JDI Passive Direct Box MK3 is listed as part of his equipment.
In a studio tour video by MusicRadar Tech on YouTube, Dubka showcases the Radial Engineering JDI Passive Direct Box MK3, highlighting its use in his recording setup.
In an Instagram post, Sam Mooradian confirms using the Radial Engineering JDI Passive Direct Box MK3, mentioning it as part of his studio setup: "loaner Apollo Twin X and Radial JDI (thank you @alden.marchand)."
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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 Engineering JDI Passive Direct Box MK3, it is most commonly used with the following gear.
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