Henry-F

Henry-F inductor-based resonant filter is a free offering by SoundDrops, as an introduction to its bigger brother, Henry-Q.

It includes a High Pass and a Low Pass filter which are entirely based on real inductors. Essentially it is the filter section included in Henry-Q (which in addition includes 2 filters, 4 eq sections and a transformer-coupled germanium stereo pre-amp stage). Both the High-Pass and Low-Pass filters in Henry-F have a 12dB/oct. slope with a continuous frequency control; they also display a unique feature, rarely found in other devices: a continuous Resonance control that adjusts the amplitude of an additional peak located near corner frequency, from 0 to a maximum of +3dB. It's a very effective sound-shaping tool.

One of the advantages of Acustica's technology is that it allows to design and build processors whose realization would be quite impractical in the analogue domain. Henry-F is a case in point, in that it includes a couple of inductor-based filters which offer a continuous control both for frequency and resonance, with a constant and predictable action throughout the range.