Rupert Neve Designs RNDI-S: Stereo Active Transformer Direct Interface

Overview: Massive Stereo Tone and Headroom

The RNDI-S is the expanded two-channel version of the industry-standard RNDI, engineered to provide unparalleled harmonic depth and clarity for stereo sources. By combining custom-designed Rupert Neve Designs transformers with Class-A, discrete FET input stages, the RNDI-S delivers a vibrant direct sound that brings instruments to life. Whether capturing high-end synthesizers, acoustic instrument duos, or professional line-level playback, this stereo interface ensures that every nuance of the original performance is preserved with “larger-than-life” tonality.

Key Features & Benefits

• Custom Rupert Neve Transformers: The RNDI-S features new custom-wound output transformers that provide exceptional galvanic isolation while introducing musical harmonics and dimension. These transformers allow the unit to drive long cable runs—exceeding 100 feet—with virtually no loss in high-frequency detail.

• Class-A Discrete FET Amplifiers: The discrete, Class-A input stages are powered by 48V phantom power, providing a high-impedance input of 2.2 Megohms. This design eliminates crossover distortion and ensures consistent, world-class performance across a wide variety of instruments.

• Unrivaled Phase Coherence: Rupert Neve Designs prioritized phase alignment across all frequencies, resulting in a sound that is more natural and “present” than standard direct boxes. This is particularly vital for maintaining the stereo image and impact of keyboards and drum machines.

• Versatile Connectivity: In addition to standard 1/4″ inputs and thru jacks, the RNDI-S includes a 3.5mm stereo input jack. This allows for the high-fidelity integration of consumer devices, mobile phones, and laptops into professional signal chains.

• Vibrant Harmonic Content: The majority of the harmonic content produced by the RNDI-S is a pleasing combination of 2nd and 3rd order harmonics. These musically relevant components enhance the richness of the signal without adding the harshness often found in IC-based designs.

• Independent Dual-Channel Power: Each channel is powered independently by +48V phantom power from the connected microphone preamplifier, with dedicated LED indicators to confirm power presence on both the left and right sides.

• Rugged Steel Construction: The internal components are protected by a heavy-duty steel frame designed to withstand the rigorous demands of professional touring and daily studio use.

Technical Specifications