Rupert Neve Designs RNDI Active Transformer Direct Interface

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Description:

The RNDI is a professional-grade active direct box designed to deliver pristine audio quality with Rupert Neve’s signature sonic character. Featuring a Class-A discrete FET amplifier and a custom transformer, it provides a rich, warm tone with low distortion and excellent frequency response. The RNDI offers two input modes — Instrument and Speaker — making it incredibly versatile for capturing electric guitars, basses, keyboards, and even amplified speaker signals. Its rugged construction and thoughtful features like a ground lift switch and phantom power operation make it ideal for studio and live use. Whether you’re tracking or reamping, the RNDI ensures your signal stays clean and musical with that classic Neve warmth.

Specifications:

  • Input Impedance:
    • Instrument Mode: 2.2 MΩ (Hi-Z)
    • Speaker Mode: 200 kΩ
  • Maximum Input Level:
    • Instrument Mode: +21.5 dBu
    • Speaker Mode: +41.5 dBu (92 Vrms / 266 Vp-p)
  • Output Impedance:
    Less than 40 Ω
  • Frequency Response:
    • ±0.25 dB: 25 Hz – 44 kHz
    • ±1 dB: 12.5 Hz – 63 kHz
    • -3 dB: 92 kHz
  • Total Harmonic Distortion (THD+N):
    • @ +20 dBu: 0.25% (2nd & 3rd harmonics)
    • @ -20 dBu: 0.015%
    • @ 20 Hz: 0.75%
  • Noise Floor:
    Better than -110 dBV (unweighted, 22 Hz – 22 kHz)
  • Power Requirements:
    Phantom power via XLR: 4.5 mA @ 48 V DC
  • Dimensions:
    6.25" (L) x 4" (W) x 1.5" (H)
  • Weight:
    1.5 lbs (0.68 kg)
  • Construction:
    Rugged steel chassis with industrial-grade powder coating

Key Features

  • Class-A Discrete FET Amplifier:
    Ensures low crossover distortion and adds musically relevant harmonics (primarily 2nd and some 3rd order) for a rich tone.
  • Custom Transformer Design:
    Provides superior passive isolation and drives long cable runs with minimal high-frequency loss.
  • Dual Input Modes:
    • Instrument Mode: For electric guitar, bass, keyboards, etc.
    • Speaker Mode: For capturing the full output of a power amplifier before it reaches the speaker.
  • Reamping Capability:
    Allows for re-amplifying previously recorded tracks by connecting a line-level output to the RNDI and then to a preamp.
  • Ground Lift Switch:
    Helps eliminate ground loop hums.
  • 48V Phantom Power Indicator:
    Blue LED indicates active phantom power.