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Analogue Systems RS100s
AS_RS100s price : 142 € incl. VAT

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This product may be back in stock soon. To pre-order it, we recommand that you place an order now. You will receive a confirmation email with the estimated delivery time. Your payment will only be charged when the product is shipped to you.
The RS100 24dB/oct low-pass filter imitates the Minimoog's filter and exhibits almost identical characteristics in both the frequency domain (i.e. what it does to audio signals) and the time domain (i.e. its response over time to CVs). Below the cut-off frequency the response is approximately flat down to DC. With the filter fully open, it will pass signals approaching 20kHz.
The RS100 has variable resonance, or 'Q'. As this is increased from its minimum, the filter will accentuate Fc, and progressively attenuate frequencies below Fc as well as those above it. As the resonance is increased further, the RS100 will exhibit the aggressive 'ringing' associated with Moog filters, and it will severely colour any signal passed through it. At the highest Qs, the filter itself will begin to oscillate, and even in the absence of any signal presented to its inputs it will then act as a sine wave generator, the frequency of which is Fc itself.
You can control 'Q' manually using the RESONANCE control. In its fully anticlockwise position, Q is approximately zero, and there is no emphasis of the signal at Fc. As you rotate the knob clockwise Q will increase until, it its fully clockwise position, the filter produces a sine wave of frequency Fc.
There is no voltage control of Q.

> tech specs
Cutoff Frequency control Fc from 30Hz to +15kHz.
Fc can also be controlled using one or both of the CV inputs
With CV conforming to the 1V/oct standard, Fc will track the CV the same way as an RS90 VCO would if you applied the same CV to its CV-IN 1V/OCT socket.
If the CV is supplied from a keyboard then, the filter is tracking the keyboard 100% and, with the resonance at maximum, you can 'play' the filter as if it were a conventional oscillator.
CV-IN VARY input enables Fc to track incoming CVs at >100% or <100%.
This socket and its associated LEVEL control allow you to specify the filter's sensitivity to CVs within the range ×V/oct to approximately 0.4V/oct. The former of these makes the filter invariant to incoming CVs, while the latter makes it over-sensitive compared to the 1V/oct input.
Inputs and Outputs
The RS100 has two inputs: SIG 1 IN and SIG 2 IN, each with an associated LEVEL control.
The inputs accept signals in the range ±10v, and these signals are mixed so that they can be filtered simultaneously.
The LEVEL controls offer unity gain in approximately the 2 o'clock position, marked '4' on the panel. At their fully anticlockwise position they attenuate the signal fully (MIN = -×dB gain) while at their fully clockwise position they offer a small gain. This (or, indeed, any high level signal) allows you to 'overdrive' the filter inputs for characteristic distortion.
There is a single output that carries a signal in the range ±10v.
12 HP

> interesting links
manufacturer's web site
http://www.analoguesystems.co.uk/pdf/RS100S.indd.pdf

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