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Symbolic Circuits Feral Filter 7410
800 SEK
Symbolic Circuits Feral Filter 7410, modul för AE formatet. OBS, inte eurorack!
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Beskrivning
Art.nr: SC7410
Voltage controlled low pass filter, 10kHz or 15kHz max depending on chip.
Compatible with all (5V versions) of the MAX74xx series of chips.
Nonstandard topologies ranging from the lame to the extreme.
CV bandwidth well into the audible range.
Inverted feedback mode for bass boosted resonance and general mayhem.
Ultradrive mode for feedback based overdrive.
1V/oct toggleable to 2V/oct to cover entire frequency range given AEs 5V range.
It is not necessarily everyday that a new type of filter enters the synthesizer market. This is not one of those days as nothing about this is particularly new but it is certainly non-standard. The FERAL FILTER brings the power of switched capacitor filters into the modular domain. Whether or not this is a good thing can be debated.
Switched capacitor filters are digitally controlled analog filters and they allow for much more exotic controllable filters than can be achieved trough conventional analog circuits. For some of these filter topologies, due to fancy math, one can apply phase inverted feedback which yields something different from the standard ringing resonance.
The nature of switched capacitor filters comes with some drawbacks such as limited bandwidth (10 or 15kHz) and the more exotic topologies have a lot of ripple. The modulating clock frequency also creates some aliasing, this is not audible under "normal" operation but when feedback is cranked unreasonably high and the modulating clock is in the audible range it is very audible. And the modulating clock has a ratio of 1:100 so it does not generate a pleasant overtone. It is what it is and it is not for audiophiles.
THE MAX7410 VERSION
This version comes with a MAX7410 chip which is a 5:th order butterworth filter with 30dB/oct attenuation. This is essentially a somewhat more aggressive version of a Ladder filter but due to it being 5:th order (why a 5:th order butterworth filter is stable with inverted feedback but not a 4:th order one is left as an exercise to the reader) it is also stable with inverted feedback yielding a pretty notable overdrive character to the feedback.
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