EAN: 676101034086
The JDI Mk3 from Radial Engineering is a professional, passive direct box that converts hi-impedance instrument signals to a balanced low-impedance output, allowing long cable runs without noise. The unit is ideally suited for all instruments including keyboards, bass guitar, and acoustic guitars for use in studio, broadcast, and live sound reinforcement.
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. Passive DIs that use inexpensive iron or steel core transformers can degrade sound through phase shift at various frequencies, a phenomenon known as group delay. This has the effect of making bass sound indistinct, causing the mid-range to smear and lack punch.
The JDI 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.
Phase-coherent professional direct box with 100% passive design and Jensen Transformer equipped
Ultra-linear performance from 20 Hz to 20 kHz
Dual-function inputs with two-channel merge
Polarity reverse, ground lift and pad switches
Ultra-durable welded steel chassis with double sided printed circuit board
No-slip bottom pad and protective channel for switches
Ideal for acoustic guitars and basses, keyboards, modules, and electronic drums
Radial Engineering JDI Mk3 Specs
| 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 | 5.5 x 3.5 x 2" / 13.97 x 8.9 x 5 cm |
| Weight | 2.2 lb / 1 kg |
| Specialties | Merge Function Converts the Input and Thru Output Jacks to Left and Right Inputs and Mixes Them to Mono at the XLR |
Packaging Info
| Package Weight | 1.79 lb |
| Box Dimensions (LxWxH) | 6.35 x 4.2 x 2.9" |
In the Box
- Radial Engineering JDI Mk3 Direct Box
- 3-Year Manufacturer Warranty (Transferable)
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