Radial Engineering JDI MK3 Passive DI Box w/Jensen Transformer

 
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Radial Engineering JDI MK3 Passive DI Box w/Jensen Transformer

SKU JDI-MK3
Weight 3.00 lbs
$199.00
Quantity

 

This is for 1-New Radial JDI passive direct box.  The Radial JDI is a passive direct box designed to handle extreme signal levels without distortion of any kind. Unlike an active DI that is limited by the buffering amplifier’s rail voltage, the JDI employs a Jensen audio transformer as the engine. Jensen transformers are legendary in their ability to gracefully handle transients while delivering a smooth, warm sounding Bessel curve, reminiscent of the finest vintage gear. Ruler flat from 10Hz to 40kHz and with virtually zero phase deviation, the JDI delivers the natural, pure sound of the instrument without artifact.

 

The 100% passive circuitry inside the JDI is incredibly efficient. The transformer performs both high-to-low impedance conversion and signal balancing at the same time with minimal loading and does so without any power whatsoever. The transformer also introduces a magnetic bridge that passes signal while rejecting stray DC voltage. This makes the JDI particularly adept at eliminating hum and buzz caused by ground loops.

 

Features include input and throughput ¼” connectors, -15dB input pad, ground lift, and 180º degree polarity reverse to help phase align the instrument with the PA. A secondary circuit is added for direct interfacing with high output devices such as guitar or bass amp loudspeakers plus a unique merge function allows stereo sources such as keyboards to be summed mono, saving valuable input channels.

 

Built tough to handle the abuse of live touring, the JDI features a 14-gauge steel I-beam inner frame and a unique book-end outer shell. The innovative design eliminates stress on the PCB, reducing opportunity for solder joints to go ‘cold’ while the outer shell creates a protective zone around the switches and connectors. The steel casing resists noise-causing electromagnetic pollution and the transformer’s sensitive inner workings are further protected from magnetic fields with a mu-metal can. This ensures the signal transfer is quiet and free from hum.

 

These combined features have made the Radial JDI the most popular passive direct box in professional touring and an excellent choice for instrument interface in the studio!

 

The Radial JDI… the world's finest passive direct box.

 

 

Features:

 

·  Jensen Transformer equipped passive DI

·  Eliminates hum and buzz from ground loops

·  Virtually zero phase & harmonic distortion

·  Exceptional signal handling and noise rejection

 

 

 

Specifications:

 

Audio circuit type:  Passive, transformer based

Number of channels: Single channel (mono)

Frequency response:  20Hz ~ 20KHz (± 0.2dB)

Dynamic range:  135dB 

Maximum input:  +21dB @ 20Hz ~ 20kHz 

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 

 

Features    

Transformer: Jensen JT-DBE, 12:1 ratio

Shield: Dual Faraday, mu-metal can

Input pad:  -15dB  

Merge:  Sums left & right sources to mono

180° polarity reverse:  Inverts absolute phase

Ground lift:  Disconnects pin-1 at XLR output 

XLR configuration:  AES standard (pin-2 hot) 

Speaker filter:  -30dB pad and band-pass filter 

Connectors: 1/4" in & thru, XLR-M out

 

General    

Construction:  14 gauge steel chassis & outer shell

Finish: Baked enamel

Size:  (W x H x D)  84 x 127 x 48mm (3.3" x 5.0" x 2")

Weight:  0.70 kg (1.55 lbs) 

Shipping Size: W x H x D: 102 x 76 x 165mm (4" x 3" x 6.5")

Shipping Weight: .87 kg (1.92 lbs)

Power:  Passive, no power required 

Warranty:  Radial 3-year, transferable

 

Applications: 

JDI with Electric Bass

The JDI is often selected for high output bass guitars. It is able to handle huge signal levels without distortion or artifact. On stage it sends the pure sound of the bass to the PA with minimal loading. In studio, it is perfect for recording direct.

 

JDI with Acoustic Guitar

Most acoustic guitars have built-in preamps that can be peaky. The JDI naturally smoothes out the transients for a warmer tone. And because the JDI is able to handle huge transients, it will not distort. This makes the JDI a great direct box for acoustic guitars.

 

JDI with Keyboards

Today's digital keyboards are not only very dynamic, some like digital pianos have a tremendously wide frequency response. The Radial JDI is able to withstand excessive signal levels at all frequencies without introducing distortion or phase shift.

 

 

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Radial Engineering JDI MK3 Passive DI Box w/Jensen Transformer
Radial Engineering JDI MK3 Passive DI Box w/Jensen Transformer
$199.00