Name: Analogue Systems RS-110N
Brand: Analogue Systems
SKU: 1554985
Rating: 75 (1 reviews)

manualAnalogue Systems RS-110N

LOG

E S

EMS

S-I

110

INTRODUCTION

The pioneers of synthesis understood that

the flexibility with which a signal could

be routed through filters was one of the

most important elements of a synthesiser.

Their modular synths featured four

different types of filter: high pass filters

which remove low frequencies (thus

making a sound thinner), low pass filters

(often used to emulate natural sounds) and

band pass and band reject (notch) filters

for resonant and special effects. These

filters determined the power and the

sound of the instrument.

In the early 1970s the Minimoog and the

ARP Odyssey defined the architecture of

integrated monosynths, and the rest of the

synthesiser world was to follow their lead

for more than a decade. The Minimoog

provided just a single low-pass filter, while

the Odyssey offered a simple high-pass

filter in addition to its low-pass filter (but

this was neither resonant nor voltage

controlled). As a result, large modular

synthesisers remained far more flexible

than their smaller brethren.

This situation persisted until the 1990s

when multimode filters reappeared on

some of the newer digitally modelled

synthesisers such as the Korg Prophecy. Unfortunately, and in common with all its brethren, the Prophecy

is incapable of handling signals from the outside world. This is because the filter circuits do not exist:

they are modelled mathematically, and form part of the complex calculations used to generate the analogue

simulation. In contrast, the RS110 is a true analogue multimode filter. It is built from discrete components,

and it eschews the use of the filter chips used by other manufacturers of analogue synthesisers. This

means that the RS110 has a unique character that sets it apart from the crowd

IN USE

The RS110 consists of a two channel audio mixer followed by four, parallel, resonant filters with voltage

controlled frequency and a unique "insert" point in the feedback path that generates and controls resonance.

Filter Modes

The RS110 offers four filter modes. These are 24dB

Oct low-pass, 24dB

Oct high-pass, 12dB

Oct band-

pass and 12dB

Oct band reject (often called 'notch') filtering, with the cutoff frequencies (Fc) of the high-

pass and low-pass outputs being the centre frequencies of the band-pass and notch outputs. Each of

these filter characteristics is described in appendix 2.

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