This low pass filter is a very good -24dB / octave Moog filter, based on the classic Moog cascade with selected, low-noise transistors. Being the successor of the RS-100, the new "S" version features several improvements regarding stability, tracking, distortion behavoiur and also the frequency range.

Two signal inputs, resonance, manually and voltage controlled cutoff frequency. Frequency range 10Hz to 35kHz with CVs applied. The transistors used in the filter cascade are low-noise and have been selected and matched in pairs to improve the frequency response over the whole frequency range. A better stability guarantees, after a one minute heating time, that the filter can be used as a clean and well tracking sine wave oscillator.