The RS-120 is quite an unusual filter because unlike other filters it cuts several notches into the audio signal which result in a comb-like look of the frequency spectrum. Soundwise it is perfectly suited to create phaser and flanger sounds.

The filter is based on a bucket-brigade-device delay with very short times that clearly changes the phase of the signal. The feedback of this delay is used here as a resonance parameter that goes up to self-oscillation.

There are two audio inputs with level control. Unity gain is reached at the pot´s position 4, beyond this point the filter will be overdriven.

A control sets the delay time from 2.5ms to 25ms and in addition there are two CV inputs for controlling delay time, one with fixed 1V/oct and a variable one.

Product specs

FAQs

What is the primary function of the Analogue Systems RS-120 Comb Filter?

The RS-120 Comb Filter is designed to create unique tonal effects by delaying a signal and adding it back to itself, which results in the cancellation and reinforcement of specific frequencies, altering the sound's tonal color.

Is the Analogue Systems RS-120 Comb Filter compatible with other Eurorack modules?

Yes, the RS-120 is a Eurorack format module, making it compatible with other Eurorack modular synthesizer systems and modules.

What type of sound effects can I achieve with the RS-120 Comb Filter?

The RS-120 can produce a range of effects from subtle phase shifts to dramatic tonal changes, making it ideal for creating resonant and metallic sounds or enhancing the harmonic content of an audio signal.

How much space does the RS-120 Comb Filter take up in a modular setup?

The RS-120 Comb Filter occupies 12HP of horizontal space in a Eurorack modular synthesizer setup.

Can the RS-120 Comb Filter be used for both audio and CV signals?

Yes, the RS-120 is versatile and can process both audio and control voltage (CV) signals, allowing for creative modulation and sound design possibilities.