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Rossum Evolution Variable Character Ladder Filter

Item#
N13-5243-D
16hp
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Rossum Evolution

The origins of the Evolution Variable Character Ladder Filter extend all the way back to the Moog ladder filter, which in turn inspired Dave Rossum to create the E-mu Systems 2100 LPF.

With the Evolution, Rossum Electro-Music have implemented an array of brand new functions that harness all the power of the 2100 while imparting new characteristics alongside new filter types.

Evolution Features

  • A Genus control that allows continuous voltage control of the number of filter poles (from 3 to 6 poles), essentially allowing real-time variation of Evolution’s effective cutoff slope from 18dB/oct to 36dB/oct. LEDs give continuous indication of the current slope
  • A Species control that lets you vary the signal level into the ladder, letting you control the intensity of the filter’s characteristic distortion. When in self-oscillation mode, this control modulates the amplitude of Evolution’s output
  • Voltage controlled resonance with a variable Q Level Compensation control that controls the balance of the resonant peak and the frequencies below the cutoff frequency (which would otherwise be attenuated as the resonance is increased)
  • An extremely accurate and temperature-stable frequency control exponential generator (accurate over 10 octaves), rivaling the specifications of the best analog VCOs

Controls

  • Initial Frequency
  • Initial Q
  • Q Level Compensation
  • Initial Genus (# of Poles)
  • Initial Species (Ladder Input Level)
  • Signal Input : 1x 3.5mm mono socket  – 100kO Input Impedance
  • Signal Output: 1x 3.5mm mono socket – 1kO Output Impedance

Frequency CV Inputs

  • 1x Attenuated – min 50kO Input Impedance
  • 1x w/Attenuverter – 100kO Input Impedance
  • 1x 1V/OCT Full Level – 100kO Input Impedance

Q CV Inputs

  • 1x Full Level – 100kO Input Impedance
  • 1x w/Attenuverter – 100kO Input Impedance

Genus CV Inputs

  • 1x Full Level – 100kO Input Impedance
  • 1x w/Attenuverter – 100kO Input Impedance

Species CV Inputs

  • 1x Full Level – 100kO Input Impedance
  • 1x w/Attenuverter – 100kO Input Impedance
  • Power Requirements: +/-12V via 16-pin, Doepfer-style connector
  • Current Draw: 85mA +12V, 75mA -12V (maximum)
  • Dimensions: 16HP (W); Rear of panel to top of power connector (with connector plugged in) 25mm (D)

Supplied Accessories

  • 1x 16-pin, Doepfer-style power cable
  • 4x M3 screws
  • 4x M2.5 screws
  • 4x Nylon washers
  • 1x Quickstart Guide
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