Radial Engineering JDI MK3 Passive Direct Box

Radial Engineering’s JDI MK3 is a professional-grade passive direct box equipped with a premium Jensen transformer, designed to capture instruments with pristine accuracy. The JDI MK3 is a nearly indestructible DI perfect for connecting electric guitars, basses, keyboards and more to recording interfaces, mixing consoles and PA systems.

Jensen Transformer Provides Optimal Isolation

At the heart of the JDI MK3 is a high-performance Jensen JT-DBE transformer that eliminates buzz, hum and ground loops. Its nickel core and low-permeability design remove phase distortion for a clean, transparent signal. The transformer fully isolates the input from the output, allowing high input levels without overloading connected equipment.

Extremely Low Distortion for Natural Tone

With near-zero phase and harmonic distortion, the JDI MK3 accurately captures the full tone of any instrument. Its frequency response is ruler-flat, preserving the natural highs, lows and everything in between. This high fidelity makes the JDI MK3 an excellent choice for both live and studio applications where maintaining tonal integrity is critical.

Built to Handle High Levels and Extreme Conditions

From its 14-gauge welded steel construction to its durable baked enamel finish, the JDI MK3 is built to survive. It withstands high input levels that would overload other DIs and its protective bookend design shields switches from damage. Inside, a locked skeletal frame protects sensitive components from external stress. This rugged dependability allows for worry-free use on stages and in abusive environments.

Maximum Flexibility for Any Setup

With input pad, polarity reverse and ground lift switches, the JDI MK3 adapts to any installation for optimal performance. Its input pad reduces the signal by 15dB to prevent overloading connected equipment, while the polarity reverse inverts pin 2 and 3 of the XLR output. The ground lift disconnects pin 1 to eliminate ground loops altogether. These features provide the flexibility to interface with virtually any audio system or instrument.