Description
Radial's ProDI is a passive direct box for stage and home recording studio use. It suits players and engineers who need to send a guitar, bass, keyboard or other instrument signal to a mixer or interface while keeping the signal stable and reducing ground loop noise.
It uses transformer isolation, a 140 kOhm unbalanced input impedance, and a 150 ohm balanced output impedance. The frequency response is 20 Hz to 18.5 kHz, and it accepts up to +18 dB at 20 Hz. It also includes a -15 dB pad and a ground-lift switch, with 128 dB dynamic range, 0.01% THD from 20 Hz to 20 kHz at -10 dB, and phase deviation of 1° at 100 Hz and 8° at 20 Hz.
In use, the instrument plugs into the 1/4-inch TS input, the 1/4-inch TS thru output can feed an amp, and the XLR output goes to a mixer, audio interface or stage box. It is passive, so it does not need power. The box includes the Radial Engineering ProDI Direct Box.
Specifications
| Input Connections | 1 x 1/4" TS |
|---|---|
| Output Connectors | 1 x XLR 1 x 1/4" TS Thru |
| Input Level | + 18 dB at 20 Hz |
| Output Level | Not Specified by Manufacturer |
| Controls | -15 dB Pad Ground-Lift Switch |
| Frequency Response | 20 Hz to 18.5 kHz, ±2.5 dB |
| Noise | Not Specified by Manufacturer |
| Dynamic Range | 128 dB |
| THD | 0.01% from 20 Hz to 20 kHz at -10 dB |
| Phase Deviation | 1° at 100 Hz, 8° at 20 Hz |
| Power | Passive |
| Dimensions | 108 x 70 x 44 mm |
| Weight | 540 g |
| Specialities | Custom Audio Transformer on Input Provides 100% Isolation to Eliminate Hum and Noise Causing Ground Loops while Maintaining Signal Integrity |
In the box
- Radial Engineering ProDI Direct Box
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