Description

Radial JDI Stereo Passive Direct Box is a passive stereo direct box designed to handle high-level signals without any distortion. Unlike an active DI, which is limited by buffer voltage, it uses a pair of Jensen audio transformers that balance the signal and reduce impedance for use with long cables. No power supply is required; simply connect it.

Key Features

    
• Passive DI equipped with Jensen transformer
    
• Eliminates hum and noise due to ground loops
    
• Zero harmonic & phase distortion
    
• Compact stereo format for double performance

Unaltered instrument sound

The magic comes from the amazing internal Jensen transformers, renowned for their ability to correctly handle transients, offering a smooth and warm Bessel curve, reminiscent of the best vintage devices. Linear from 10Hz to 40kHz and with virtually zero phase deviation, the JDI Stereo keeps the instrument's sound natural and pure, not artificial. In addition to converting the unbalanced Hi-Z signal, the transformers isolate the input from the output, filtering out DC voltage that can cause noise and lead to so-called ground loops. All of this allows audio to pass through while eliminating problems.

Features include ¼" input and thru-put connectors plus a -15dB input pad on each channel. There is also a ground lift switch that lifts pin 1 on the two XLR outputs to further reduce hum and noise caused by ground loops. Built robustly to withstand the extreme demands of touring, the JDI Stereo uses a 14-gauge I-beam steel frame and an exclusive book-style outer shell. The innovative design eliminates stress on the circuitry, reducing the possibility of solder joint detachment, while the outer shell creates a protective zone around switches and connectors. The steel enclosure works with the mu-metal transformer and internal Faraday shielding to protect sensitive internal mechanisms from powerful magnetic fields, such as those generated by amplifiers, ensuring quiet, hum-free signal handling. The original Radial JDI has become the most famous passive direct box in professional touring and recording studios worldwide, and there is no doubt that the JDI Stereo will follow suit. The combination of these features has made the Radial JDI the most famous passive direct box in professional touring and an excellent choice for studio instrument use! Radial JDI - the best passive direct box in the world.

JDI™ - Applications

Two basses connected to amplifiers and PA system

The JDI Stereo is perfect for sending the pure bass signal to the PA system. Use the Thru connectors to feed two channels on your amplifier.

Stereo Laptop with keyboard/controller

The JDI Stereo is equipped with Jensen transformers and can correctly and easily handle extreme transients from a digital piano, laptop, or DJ mixer.

Two acoustic guitars connected to the PA system

Jensen transformers level out the peaks of the acoustic guitar, producing a rich, warm sound.

JDI Technical Specifications

    
• Audio circuit type: Passive, transformer-based
    
• Transformer: Jensen JT-DBE
    
• Number of channels: 2 channels (Dual Mono)
    
• Frequency response: 20Hz ~ 20KHz (± 0.2dB)
    
• Dynamic range: 135dB
    
• Total harmonic distortion: 0.05% from 20Hz ~ 20kHz @-10dB
    
• Phase deviation: 0.3° @ 100Hz; 3° @ 20Hz
    
• Input impedance: 140k Ohms, unbalanced
    
• Output impedance: 150 Ohms, balanced
    
• Maximum input level: +21dB @ 20Hz ~ 20kHz
    
• Features
    
• -15db attenuation pad, Ground Lift
    
• Input connectors: unbalanced 1/4"
    
• Output connectors: XLR OUT, 1/4" thru
    
• General Specifications
    
• Construction: 14 gauge steel chassis and outer shell
    
• Dimensions (L x W x D): 127mm x 84.1mm x 45.5mm - 5" x 3.3" x 1.8"
    
• Weight: 703 grams - 1.55 lbs
    
• Power supply: Passive, no power required
    
• Operating conditions: Dry locations only between 5°C and 40°C