“The band wanted a more controlled guitar sound, so they switched to the Fractals…they were a little lacking in tonality, so I put RNDIs on all of them and everybody noticed the difference immediately. Any time I have to use a Fractal from now on, I’ll throw an RNDI on it. It just makes everything sound better.”
CONTROLS & I/O
¼” INPUT
Hi-Z unbalanced input:
2.2M Ohms (Instrument)
200 kOhms (Speaker)
¼” THRU
Parallel ¼” port used to send signal to an amp (instrument mode) or speaker (speaker mode).
SPEAKER / INSTRUMENT INPUT LEVEL
Selects Speaker or Instrument level.
Max input: +20.5dBu Instrument, +41dBu Speaker
48V POWER LED
Indicates that +48V phantom power is present from the connected mic preamp (required to power the RNDI).
GROUND LIFT
Isolates the XLR Pin 1 from the circuit ground.
OUTPUT
Transformer-balanced XLR output. Impedance less than 40 Ohms. Phantom power to the RNDI is supplied through this connection.
FEATURES
Groundbreaking Direct Tone
When class-A, discrete amplifiers meet Rupert’s custom transformers, good things happen to your tone. The RNDI is imbued with the unique components and design knowledge that makes it worthy of the Rupert Neve name.
Huge Headroom
The high input headroom of +20.5 dBu (typical) is capable of handling a wide range of sources – and in speaker mode, the RNDI can handle the full output of a 1000-watt power amplifier (92 Vrms or 266Vp-p).
Rugged Solid Steel Frame
The rugged steel chassis features an industrial-grade powder coating, and is built to withstand the severe stresses of life on the road.
Use a Variety of Sources
The RNDI has immensely consistent performance across a wide variety of sources due to its 2.2M Ohm discrete FET input stage and high headroom. The RNDI can be used with confidence on guitars, synths, basses, acoustic instruments, keyboards & drum machines. And in speaker mode the input headroom increases even further, providing an easy way to inject the pleasing harmonic content of the RNDI into literally any source.
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
In instrument mode the THRU output can feed the amplifier input for reinforcement. In speaker mode, the THRU is used to feed the amplified signal to the speaker.
Ground Lift
A ground lift switch is provided on the back to help fix any problematic grounding.
Phantom Powered
The RNDI is powered by standard 48V phantom power. Power is indicated by a blue LED on the front panel.
NOISE (22 Hz - 22 kHz, Un-weighted)
Better than -110 dBV
INPUT IMPEDANCE
Instrument Mode: 2.2 Megohm
Speaker Mode: 200 Kilohm
OUTPUT IMPEDANCE
Less than 40 Ohm
FREQUENCY RESPONSE
+/- 0.25 dB from 28 Hz – 60 kHz
+/- 1 dB from 14 Hz – 90 kHz
-3 dBu below 5 Hz
MAXIMUM INPUT LEVEL
Instrument Mode: +20.5 dBu (8.2 Volts RMS) Typical
Speaker Mode: +41 dBu (87 Volts RMS) Typical
MAXIMUM OUTPUT LEVEL
+11.5 dBu Typical
TOTAL HARMONIC DISTORTION + NOISE
@ 1 kHz, +20 dBu input level: 0.25% Typical (2nd and 3rd Harmonic)
@ 1 kHz, -20 dBu input level: 0.015% Typical (2nd and 3rd Harmonic)
@ 20 Hz, -20 dBu input level: 0.75% Typical (2nd and 3rd Harmonic)
POWER REQUIREMENTS
4.5mA Per Channel @ +48VDC
UNIT DIMENSIONS
4” W x 6.25” D x 1.75” H
(10.2 cm W x 15.9 cm D x 4.5 cm H)
UNIT WEIGHT
1 lb. (0.45 kg)
SHIPPING DIMENSIONS
10” W x 8” D x 3” H
(25.4 cm W x 20.3 cm D x 7.6 cm H)
SHIPPING WEIGHT
3 lbs. (1.4 kg)
