The Rupert Neve Designs RNDI-M is a compact, high-performance direct injection (DI) box featuring the same custom transformers and discrete Class-A FET circuitry as its larger counterparts, delivering an uncompromised signal with exceptional clarity, massive headroom, and extended frequency response.

Compact Design with Uncompromised Sound

Designed for musicians and engineers who demand pristine sound quality in a more portable format, the RNDI-M distils the renowned sonic characteristics of the award-winning RNDI, RNDI-S, and RNDI-8 into a pedalboard-friendly chassis. Despite its reduced size, it retains the essential components that define the signature Rupert Neve Designs tone. By housing its circuitry in a rugged, road-ready steel enclosure, the unit ensures durability in both studio and live environments.

Superior Transformer-Coupled Performance

At the heart of the RNDI-M is a custom-wound Rupert Neve Designs transformer, engineered to provide exceptional passive isolation while adding musical harmonics and depth to the audio signal. The low-impedance, transformer-balanced output ensures stable performance over long cable runs, maintaining signal integrity and preventing tonal degradation, a critical feature for both stage and studio applications.

Class-A Discrete FET Input for Sonic Purity

The RNDI-M’s class-A, discrete FET input stage operates on +48V phantom power, delivering a high-impedance input of 2.2MΩ to preserve the natural dynamics and tone of any instrument. Unlike designs that introduce crossover distortion, this circuit topology eliminates undesirable upper-order odd harmonics, producing a harmonically rich, musical response dominated by second-order (octave) and third-order (fifth above octave) harmonics. By avoiding integrated circuits (ICs) and digital components, the RNDI-M maintains an entirely analogue, high-fidelity signal path.

Extended Frequency Response and Massive Headroom

With an exceptionally wide frequency response extending from below 5Hz to over 90kHz, the RNDI-M reproduces every nuance of an instrument’s sound with remarkable accuracy. Its frequency response remains flat within ±0.25dB from 28Hz to 60kHz, ensuring a deep, defined low end and articulate highs. The headroom of +20.5dBu allows the unit to handle high-output sources such as electric guitars, basses, keyboards, synthesizers, drum machines, and even pre-recorded material without distortion or compression, making it a versatile tool for any signal chain.

Optimised Signal Transmission and Versatile Connectivity

A high-quality 1/4” THRU output enables simultaneous connection to an amplifier while preserving signal integrity. The low-impedance transformer-coupled output, measuring below 40Ω, efficiently drives long cable runs without compromising frequency response. A ground lift switch on the rear panel isolates pin 1 of the XLR balanced output from the circuit ground, effectively eliminating unwanted hum and noise caused by ground loops.

Reliable Power and Rugged Construction

Powered by standard +48V phantom power, the RNDI-M integrates seamlessly into professional studio and live setups, indicated by a front-panel blue LED. The robust steel chassis ensures reliability in demanding conditions, protecting the internal circuitry from physical damage and electromagnetic interference, making it an ideal choice for touring musicians and audio professionals.