Filter Preamp

Constance Bass – Filter Preamp

Constance bass models come with Nova – Omnia FRFR (Full Range Flat Response) Pickups to capture the instrument’s detail accurately. The Filterpreamp features an individually adjustable variable low-pass filter with an optional resonance boost for each pickup. Combined with the switchable high-frequency enhancement and the flexible Pickup wiring options, this system provides precise and musical control over your instrument’s frequency response – from warm, vintage-inspired tones to articulate, modern clarity.

Controls and Functions:

Controls and Functions:

Vol

  • Volume Knob

PU Blend

  • Pickup blend knob with centerdent, balances between the two pickups.
  • Left: neck pickup only / Right: bridge pickup only / Center: both pickups equally

Push-Push Function (High Frequency Boost)

  • Engages a high-frequency boost (high-pass filter above 4 kHz).
  • Ideal for adding presence and sparkle when filters are closed.

Toggle Switches – (parallel / splitcoil / series)

  • each pickup can be selected between:

Up : Parallel – transparent and balanced tone with slightly lower output.

Middle : Splitcoil – clear and open single-coil character.

Down : Series – full, powerfull output.

Filter Bridge/Neck

  • The filter knob (per pickup) adjusts the cutoff frequency of the low-pass filter.
  • Range: approximately 250 hz – 4 kHz.
  • Turning left closes the filter for a darker tone; turning right opens it for a brighter, more open sound.

Push-Push Function (Resonance Boost)

  • Enganging the push-push switch adds a resonance peak of about +8dB at the cutoff frequency.
  • Produces a focused and punchy tone with enhanced definition.

Additional Sound Options

Internal Trimpots allow fine-tuning for perfect balance and tonal control.

Select which pickup the hf-signal is taken from (default: 100% neck pickup)

Adjust relative pickup volume

Adjust high-frequency boost volume (default: 50%)

Frequency Response of the Filter:

Frequency response of the filter

Useful Tips

With the hf-boost disabled and the filters fully open (resonance boosted) the bass sound is close to that of a passive instrument.

Experiment with filter and resonance per pickup individually to discover your own sound palette.

Combine pickup wiring modes for more expressive tonal variations.

Engage resonance-boost for added punch and definition without external Eqs.