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Dr. Wiener Ed. : Tropical Mica Serge ResEQ

Dr. Wiener Ed. : Tropical Mica Serge ResEQ

Regular price $795.00 USD
Regular price Sale price $795.00 USD


Resonant Equalizer (RESEQ) Dr. Wiener Edition: Tropical Mica

In Stock

Through experitation building many resonant equalizers we realized that the type of capacitor used in the frequency band vary the sound greatly effect the sound of the instrument:  This one sounds dirty compressed and gigantically harmonic.

Random*Source Serge Modular Resonant Equalizer in eurorack format custom built with New Old Stock (never used) Vintage Tropical Fish + Silver Mica Military Capacitors.

The special thing about the resonant eq is that each frequency band uses a pair of capcitors and each band has a different capacitor value.

We collaborated with knobknobs to create a knob for each frequency band that represents the capacitor on the back of the instrument,.

Tropical Fish caps were used in many legendendary 70s electronics and the Mica capacitors were used in a lot of old radoio and industrial operations. Tropical Fish get their name from the stripes which represent the capacitor value in scientific language. Now the language is transfered to the front of the panel with the hand made knobs from knobknobs.

Mica Capacitors are made from a naturaly occuring mineral in metamorphic rocks and solidified lava. The sound of the earth.




The RESONANT EQUALIZER (EQ) is a unique ten-band filter designed specifically for electronic sound synthesis and processing. Except for the top and bottom frequency bands, the bands are spaced at an interval of a major seventh. The Resonant Equalizer is designed to produce formant peaks and valleys similar to those in acoustic insstruments.

There are three equalized outputs: the two COMB outputs provide the sums of the two alternate filter bands, while the two top outputs are the (identical) mix of all filter bands. Please note that there is no sharp separation between the bands, moving any frequency knob will have an influence on both COMB outputs. This equalizer is special in that the bands can be set to be resonant: when the knobs are in the middle position, the response at the main EQ Output is flat. When the knobs are positioned between the 9 and 3 o’clock position, up to 12 db of boost or cut is set at the band. If the knob is set beyond the 3 o’clock position, the band will become resonant, simulating the natural resonance of acoustic instrument formant structures. Below the 9 o’clock position, increased band rejection is achieved.

The Random*Source version of the filter is a licensed and authorized adaption of the legendary Serge equalizer for Eurorack. It adds an input mixer with 2 inputs that can be built/used to attenuate or amplify/distort the input signal(s) before they are sent into the EQ and a Feedback section (knob and phase switch) which allows to feed back the output signal or the inverted output signal (depending on the Phase switch). Adding inverted feedback leads to phase cancellation effects - unlike the “normal” feedback, level decreases and the signal thins out.


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