Radial Engineering JDI Mk3 Direct Box

Product #96286 | SKU RA-JDI | Radial
In stock Ships direct Monday
Our Price $469.00 AUD
In stock Ships direct Monday
- +

this item may be nonreturnable
Shipping & Availability
Ships Monday. Deliver to New South Wales for $5.90 Change location
Click & Collect Availability
Sydney Out of stock. Pickup in 2 - 3 working days
Click & Collect


  • Eliminates Hum & Buzz from Ground Loops
  • Zero Phase & Harmonic Distortion
  • Jensen Transformer Equipped


The Radial Engineering JDI Mk3 Direct Box is a professional, passive direct box that converts hi-impedance instrument signals to a balanced low-impedance output, allowing long cable runs with no noise. Because of the transformer, the JDI provides 100% isolation between the instrument input side and the balanced output, eliminating hum and buzz caused by ground loops.

The JDI also employs a Jensen transformer with a nickel-laminated core which does not retain a memory or polarity. This reduces phase distortion, improves linearity and lowers harmonic distortion. A 15 dB pad is provided for high-level instruments to avoid input distortion. A merge switch converts the thru output to a second input, allowing two signals, such as those from a stereo keyboard, to be summed to mono when input channel availability is limited.

The unit is built to withstand the abuse of the road. The book-cover design features an internal 14-gauge steel skeleton that is corner welded to ensure the internal electronics will never be subjected to outside stress. The military grade PC board is mounted on steel pem nuts and the whole is then enclosed in a second steel casing. The passive design requires no power source.


Input Connections 1 x 1/4" TS Phone
Output Connectors 1 x XLR
1 x 1/4" TS Phone Thru
Input Level +21 dBu at 20 Hz (Max)
Input Impedance 140 Kilohms (Typical)
Output Impedance 150 Ohms, Balanced (Typical)
Controls -15 dB Pad
Polarity Reverse
Ground-Lift Switch
Merge of Input and Thru
Parallel 12" Speaker Emulation Switch
Frequency Response 20 Hz to 20 kHz, ±0.2 dB
Noise SNR: 119 dB
Power Passive
Dimensions 13.97 x 8.9 x 5 cm
Weight 1 kg
Specialities Merge Function Converts the Input and Thru Output Jacks to Left and Right Inputs and Mixes Them to Mono at the XLR

In The Box

  • Radial Engineering JDI Mk3 Direct Box


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  • Product: Radial Engineering JDI Mk3 Direct Box
  • Manufacturer: Radial
  • Model: JDI Mk3
  • RM Product #: 96286
  • Warranty: 5 year manufacturer warranty

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