Rupert Neve Designs RNDI Manual

Rupert Neve Designs Ikke kategoriseret RNDI

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Side 1/2

RNDI:

Active Transformer Direct Interface

User Guide

RNDI Speciﬁcations

Noise:

Measured Output, un-weighted, 22Hz-22kHz, source impedance 150 Ohms to 10K Ohms

Better than -110dBV

Input Impedance

Instrument Setting 2.2 Meg Ohm

Speaker Setting 200k Ohm

Output Impedance Less than 40 Ohms

Frequency Response

+/- 0.25db 25Hz – 44kHz

+/- 1dB 12.5Hz – 63kHz

-3dBu 92kHz

Maximum Input Level

Instrument = +21dBu Typical

Speaker = +41.5dBu, 92 Vrms (266Vp-p)

Maximum Output Level +11.5dBu output at maximum input level

Total Harmonic Distortion plus Noise

@ 1kHz, +20dBu input level 0.25% Typical (2nd and 3rd harmonic)

@ 1kHz, -20dBu input level 0.015% Typical (2nd and 3rd harmonic)

@ 20Hz, -20dBu input level 0.75% Typical (2nd and 3rd harmonic)

Power Requirements Phantom powered, 4.5mA @ +48VDC

Weight 1.5lbs

Dimensions 6.25” long x 4”wide x 1.5” high

PN: 775-00022

Thank you for your purchase of the RNDI Active Transformer Direct Interface. Everyone at Rupert Neve

Designs hopes you enjoy using this tool as much as we have enjoyed designing and building it.

Front / Back Panel

RNDI Overview

The RNDI is designed to deliver instrument (electric guitar, bass, keyboard, piezo pickup, etc.) and speaker

feed direct injection with unprecedented sound quality. The class-A & discrete circuit topology found

in the RNDI is based around Mr. Rupert Neve’s custom transformers, and allows for outstanding sonic

performance and superior noise rejection. The RNDI can handle extremely high input levels without

clipping (+21dBu on instrument & 41.5dBu on speaker), and the transformer coupled output has a very

low output impedance of 40 Ohms, which is capable of driving long lines with minimal loss. The chassis

of the RNDI is a formed steel clamshell designed to hold up to the rigors of use on stage or in the studio.

Usage Notes

Power for the RNDI is supplied by standard 48V phantom power on the XLR output connection, and is

indicated by a front panel LED. Try to avoid placing the RNDI close to strong electro-magnetic radiators

like power ampliers, as some noise can still be induced on the transformers through the RNDI’s steel

shielding. To minimize ground loop hum, the full signal chain should ideally be on a single isolated

circuit. If you are experiencing a hum on the RNDI output or amplier, experiment with switching the

ground lift on the RNDI and ground lifts on other components in the chain. If that doesn’t work, try

removing certain modules or powering off other devices on the same power circuit to minimize the hum.

In an instrument conguration, the DI converts the impedance of the instrument signal, balances the signal

(if unbalanced), provides a buffered output stage to send to a separate mic preamp, and optionally sends

the THRU connection to the amp input. To get the best performance out of your RNDI, we recommend

you use the best available cables and mic preamps, and output the maximum level from your instrument.

In a speaker feed conguration, the DI is used post power amplier to capture the tone of the preamp and

power amp. Be sure to switch the RNDI input level to speaker and connect the amplier and speaker

BEFORE turning the amplier on. With tube power amps, THE SPEAKER MUST BE CONNECTED to the

THRU connection to provide a load for the amplier. Solid state amps can generally be run without a

speaker connected. See the diagrams below for standard connection examples.

RNDI: Active Transformer Direct Interface

1/4” Input

Hi-Z Unbalanced Input

2.2M Ω : Instrument

200KΩ : Speaker

1/4” Thru

Parallel 1/4” Port

used to send signal

to the amp or speaker

Input Level

Selects speaker or

instrument level

Max input +21dBu Inst.

or +41.5dBu Speaker

SPEAKER

INPUT LEVEL

INSTRUMENT

48V

POWER

IN THRU

Rupert Neve Designs

Ground Lift

Isolates the XLR pin 1

from the instrument

input ground

Output

Transformer balanced

XLR Output. Impedance

less than 40Ω

LIFT

GND

OUTPUT

Active Transformer

Direct Interface

Rupert Neve Designs, LLC

RND I

To RNDI In

SPEAKER

INPUT LEVEL

INSTRUMENT

48V

POWER

IN THRU

Rupert Neve Designs

To Amp In XLR Output on Back:

To Mic Pre

0dB 66

20Hz 250Hz

100

MIN MAX

TEXT U RE

0dB

-6 +6

TRI M

GAIN

POWER

SILK

48V

HPF

HP F

Rupert Neve

Design s 511

MIC PRE

+ SILK

-2

-10

LEVEL

Powered Amp Out

To RNDI In

SPEAKER

INPUT LEVEL

INSTRUMENT

48V

POWER

IN THRU

Rupert Neve Designs

To Amp In

XLR Output

To Mic Pre

60dB 66

20Hz 250Hz

100

MIN MAX

TEXT U RE

0dB

-6 +6

TRI M

GAIN

POWER

SILK

48V

HPF

HP F

Rupert Neve

Design s 511

MIC PRE

+ SILK

LEVEL

Thru Out

To Speaker In

Instrument Conﬁguration (Instrument Selected) Speaker Feed Conﬁguration (Speaker Selected)

Produkt Specifikationer

Mærke:	Rupert Neve Designs
Kategori:	Ikke kategoriseret
Model:	RNDI

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