Radial ProDI

Passive Direct Box


Radial ProDI

The Radial ProDI is a passive direct box designed for use on stage or in-home recording studios, with the ability to handle high output instruments without distortion, and a transformer-isolated output to eliminate noise from ground loops.

  • Compact passive direct box for stage and studio
  • Able to handle huge transients without distortion
  • Transformer isolation eliminates noisy ground loops
  • Plug and play easy to use feature set – on stage or in the studio

World-class DI

The heart of the ProDI is a custom wound Radial transformer. It features an exceptionally high 140kΩ input impedance to reduce loading while enabling the ProDI to handle extreme signal levels at all frequencies without distortion. This is further improved upon with an internal MuMETAL® shield to protect against electromagnetic fields that can cause unshielded transformers to distort.

Audio circuit type: Passive, transformer-based
Transformer: Eclipse ET-DB2, 12:1 ratio
Number of channels: Single-channel (mono)
Frequency response: 20Hz ~ 18.5KHz (± 0.2dB)
Dynamic range: 128dB
Total harmonic distortion: 0.01% from 20Hz~20kHz @-10dB
Phase Deviation: 1° @ 100Hz; 8° @ 20Hz
Input Impedance: 140k Ohms, unbalanced
Output Impedance: 150 Ohms, balanced
Maximum Input: +18dB @ 20Hz
Input pad, Ground lift
Input Connectors: 1/4″ in & thru
Output Connectors: XLR-M out
Construction: 14 gauge steel chassis & outer shell
Size (L x W x D): 4.25” x 2.75” x 1.75″ (108 x 70 x 44mm)
Weight: 1.2lb (0.54kg)
Shipping size (L x W x D): 6.5″ x 4″ x 3″ (165 x 76 x 102mm)
Shipping weight: 1.35lb (0.61kg)
Power: Passive, no power required
Conditions: For use in dry locations only between 5°C and 40°C
Warranty: Radial 3-year, transferable


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