Rupert Neve Designs RNDI Active Transformer Direct Interface

The Rupert Neve Designs RNDI is a high-performance active direct box that delivers studio-quality tone and exceptional clarity for both instruments and speaker-level signals. With its custom Rupert Neve transformer, Class-A discrete FET input stage, and rugged steel construction, the RNDI is engineered to provide rich harmonic detail, superb headroom, and versatile functionality whether in the studio or on stage. It is powered by standard 48V phantom power and built to handle anything from electric guitars to powerful amp outputs with ease.

Specifications

• Input Impedance
– Instrument Mode: 2.2 MΩ
– Speaker Mode: 200 kΩ

• Output Impedance
– Less than 40 Ω

• Frequency Response
– ±0.25 dB from 28 Hz to 60 kHz
– ±1 dB from 14 Hz to 90 kHz
– -3 dB below 5 Hz

• Maximum Input Level
– Instrument Mode: +20.5 dBu (8.2 V RMS)
– Speaker Mode: +41 dBu (87 V RMS)

• Maximum Output Level
– +11.5 dBu

• THD+N (Total Harmonic Distortion + Noise)
– At 1 kHz, +20 dBu input: 0.25%
– At 1 kHz, -20 dBu input: 0.015%
– At 20 Hz, -20 dBu input: 0.75%

• Noise (22 Hz – 22 kHz, unweighted)
– Better than -110 dBV

• Power Requirement
– 48V phantom power (4.5 mA current draw)

• Dimensions
– 6.25" (Depth) x 4" (Width) x 1.5" (Height)

• Weight
– 1.5 lbs

Features

• Custom Rupert Neve-designed transformer for rich harmonic content
• Class-A discrete FET input stage for exceptional clarity and low distortion
• Handles high-power amp outputs in speaker mode
• Rugged steel chassis for professional use
• Ground lift switch for eliminating hum
• Operates on standard 48V phantom power (no batteries required