The Radial Engineering JDI is a high performance passive direct box for live concert touring and professional studio recording applications, featuring a premium Jensen transformer for exceptional audio performance. Pure Sound of the Instrument The Radial JDI is a passive direct box designed to handle extreme signal levels without distortion of any kind. At the heart, the Radial JDI employs the world class Jensen JT-DB-EPC audio transformer 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. By its no-power passive design, the Radial JDI performs both high-to-low impedance conversion and signal balancing over 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. Product Specifications: Audio Circuit Type: Passive, transformer based Transformer: JT-DB-EPC Number of Channels: Single channel (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: +21dB @ 20Hz ~ 20kHz Features: Input pad, Mono Sum, 180° polarity reverse, Ground lift, Speaker filter Construction: 14-gauge steel chassis & outer shell Finish: Durable powder coat Size (L x W x D): 5" x 3.3" x 1.8" (127mm x 84.1mm x 45.5mm) Weight: 1.55 lbs (703 grams) Shipping Size (L x W x D): 6.5" x 4" x 3" (165mm x 102mm x 76mm) Shipping Weight: 1.92 lbs (870.9 grams) Power: Passive, no power required Conditions: For use in dry locations only between 5°C and 40°C
