Rupert Neve Designs RNDI-M Active Transformer Direct Interface

Benefits

Groundbreaking Direct Tone

• When class-A, discrete amplifiers meet Rupert�s custom transformers, amazing things happen. The RNDI-M contains the unique components and design knowledge that make it worthy of the Rupert Neve name

Huge Headroom

• Maximum input level is a massive +20.5 dBu, making the RNDI-M capable of handling not only instruments, but also keyboards, drum machines, and even pre-recorded material

Rugged Solid Steel Frame

• The rugged steel chassis is built to withstand the severe stresses of life on the road

Use on a Variety of Sources

• The RNDI-M has immensely consistent performance across a wide variety of sources due to its 2.2-Megohm discrete FET input stage and high headroom. The RNDI-M can be used with confidence on guitars, synths, basses, acoustic instruments, keyboards, and drum machines

Drive Longer Lines

• The low-impedance transformer coupled output�below 40 ohms�is capable of driving long lines while maintaining exceptional high-frequency performance

1/4" THRU Output

• The THRU output can be used to maintain optimal input level to an amplifier with no signal degradation

Ground Lift

• A ground-lift switch is provided on the rear panel to isolate pin 1 on the XLR balanced output from the circuit ground to help fix any potential grounding issues

Phantom Powered

• The RNDI-M is powered by standard 48V phantom power. Power is indicated by a blue LED on the front panel

Signature Sound

The RNDI-M's signature sound is primarily the product of a custom Rupert Neve Designs transformer and a class-A, discrete FET input stage. The carefully orchestrated union of these two elements is key to the RNDI-M's unique accuracy, tone, and response.

The Custom Transformer

The RNDI-M's custom-wound output transformer provides exceptional passive isolation while adding musical harmonics and dimension to the sound. The low-impedance, transformer-balanced output excels at driving long cable runs, and its performance is consistent regardless of the connected equipment. This is equally important for both live and studio environments where the audio signal may travel almost 100' before hitting an amplifier.

The Class-A Discrete FET Amplifier

• The class-A, discrete FET input stage in the RNDI-M is powered by external +48V phantom with a high-impedance input of 2.2 Megohms that ensures consistent performance with a wide variety of instruments and other sources
• The class-A design ensures that zero crossover distortion is added to the signal, which can add upper-order odd harmonics that are musically dissonant in nature
• With the RNDI-M, the majority of harmonic content is a pleasing combination of 2nd order (octave) and 3rd order (fifth above octave). These musically relevant harmonics, present in subtle amounts, enhance the richness of the original signal and provide a distinctly musical response
• The discrete aspect of the RNDI-M�s design means there are no ICs or digital components that may cause negative effects on the tone

Wide Bandwidth, Giant Headroom

• The RNDI-M is flat within a quarter dB from 28 Hz to 60 kHz, ±1 dB up to 90 kHz, with low-frequency response all the way down below 5 Hz. However, measurements are only part of the equation: combine this extended bandwidth with the output transformer�s harmonic enhancement, and a thunderous low-end emerges that feels an octave deeper than anything else without losing any midrange richness or top-end sparkle
• The RNDI-M�s uniquely high input headroom of +20.5 dBu is capable of handling not only instruments, but a wide variety of sources, such as synths, keyboards, drum machines, and even pre-recorded material. This allows the RNDI-M to inject that coveted Rupert Neve Designs tone into a wide variety of sources

Rupert Neve Designs RNDI-M Specs

Item Type	Standard DI
Number of Channels	Single-Channel
Active/Passive	Active
Circuitry	Solid-State (FET)

Pad	No
Ground Lift	Yes
Polarity Reverse	No

Low-Cut/High-Pass Filter

No

Audio I/O

1x 1/4" TS Unbalanced Input 1x 1/4" TS Unbalanced Thru 1x XLR 3-Pin Balanced Output

Frequency Response	28 Hz to 60 kHz ±0.25 dB 14 Hz to 90 kHz ±1 dB
Maximum Input Level	+20.5 dBu
Input Impedance	2.2 Megohms
Output Impedance	40 Ohms
Total Harmonic Distortion/Noise	0.25% (at 1 kHz, +20 dBu Input Level) 0.015% (at 1 kHz, -20 dBu Input Level) 0.75% (at 20 Hz, -20 dBu Input Level)
Signal-to-Noise Ratio	-110 dBV

Operating Voltage

48 V (Phantom Power)

Dimensions

4.75 x 3.25 x 1.75" / 12.06 x 8.26 x 4.45 cm

Package Weight	1.2 lb
Box Dimensions (LxWxH)	5.9 x 4.1 x 2"