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EVC EVC EVC
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EVC+ front EVC+ side EVC+ detail

EVC FILTER

24dB State Variable Filter.

EVC is an acronym for "Everything Voltage Controlled", one of the core ideas at Aemit.
The EVC Filter is a truly revolutionary design, which encourages the fearless user to unlock a Pandora's box of previously unexplored sonic territories.

At its heart, the EVC Filter is a 4-pole 24dB/Oct State Variable filter, with simultaneous lowpass, highpass and bandpass outputs and a separate variable state output as well. Since the EVC Filter can operate in both audio and sub-audio range, its two signal inputs are DC-coupled. One of those inputs has automatic gain control, keeping your output levels in check when working with high-Q settings.

When we say "EVC+", we mean it.
Obviously its cutoff frequency is voltage controlled, with a 1V/Oct input (the EVC Filter tracks quite well when used as an oscillator) and two exponential fm inputs, one of which has a bipolar control. Note that the EVC has both coarse and fine tune knobs, for when precision tuning is required. Resonance goes up to self-oscillation, and is under voltage control as well.
The EVC's slope can vary between 6dB and 24dB and anything in between. This can be done manually, and under voltage control. Voltage controlled Slope. Yes, sir. The EVC's state can vary between LP, BR (or Notch) and HP, and anything in between. This can be done manually, and under voltage control. Voltage controlled State. Yes, ma'am.

There is no other [hardware] filter in the world which can do this.
While we're at it, let us remind you that the EVC filter is fully analogue.

A good synthesizer filter must have body and soul, of which the EVC Filter has plenty, but a truly standout filter must also possess its own character, often making it instantly recognizable amongst its peers. Our filter imposes its unique and easily identifiable character by giving the user control over how resonance is handled, through means of a peaking control. When set to "twin peaks", the filter will behave and sound like it is nearly oscillating, but it will actually never burst into self-oscillation, giving the user enough confidence to seek and explore the outer limits without actually blowing up anything.

All good things come in pairs, goes the saying, and the EVC Filter is no exception to that.
When hooked up to the optional EVC+ expander (and a second EVC Filter, obviously), you gain additional [voltage] control over both cutoff frequencies at once, instantly enabling exotic possibilities like bandwidth-controlled 24dB Bandpass superiority, or pseudo-formant filtering. Most dual filter designs allow you to switch between serial and parallel routing, but Aemit decided to up the ante, and thus offers full voltage control over routing, thereby opening up uncharted um, routes to sonic bliss.

EVC Filter pairs well with any source of complex waveforms like our VCO II or Variphase, but pairs equally well with another EVC Filter.

Specifications EVC Filter

  • LP (24dB), HP (24dB), BP (12dB) and Variable outputs.
  • Audio range and Low (DC) range.
  • Two Signal inputs with attenuator; Automatic Gain Control on input 1. Input 2 can be overdriven, with soft clipping.
  • Two FM inputs with attenuator, 1 is bipolar.
  • 1V/oct input, tracks ±6 octaves.
  • Voltage controlled Resonance (Q), up to self-oscillation.
  • Voltage controlled Slope from 6dB to 24dB per octave.
  • Voltage controlled State : from LP over Notch to HP.
  • Bandpass switch.
  • Double Peaking control (suppresses self-oscillation).
  • Fine Tune control for Cutoff frequency.

  • Fully analog architecture.

  • Skiff friendly : 41mm deep behind front panel, including power header.
  • Shrouded header on the power supply connector, no risk for reverse polarity.
  • Includes printed manual and power cable.

  • 16hp
  • tba +12V, tba -12V, 0mA 5V

Specifications EVC+

    Optional. Requires 2nd EVC Filter.
  • Master Cutoff frequency control; controls both frequencies simultaneously.
  • Master CV input with attenuator.
  • Spread CV input with bipolar attenuator; shifts both frequencies in opposite directions.
  • Voltage controlled Routing : Parallel to Series.
  • Routing CV input with attenuator.
  • Trim control for Filter 2, when in series.
  • Switch to disable Routing.

  • Skiff friendly : 41mm deep behind front panel, including power header.
  • Shrouded header on the power supply connector, no risk for reverse polarity.
  • Includes printed manual and power cable.

  • 8hp
  • tba +12V, tba -12V, 0mA 5V