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Doepfer A-120 Eurorack Low Pass Filter Module

Doepfer A-120 Eurorack Low Pass Filter Module

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Doepfer A-120 Low Pass Filter

The Doepfer A-120 is a 24dB Transistor Ladder Filter Module, inspired by the Bob Moog ladder filter design.


Probably the most famous filter circuit amongst synthesizer enthusiasts, the Moog Ladder Filter was conceived by Bob Moog back in the 1960's and was first seen in the Model D.


Still finding favour with many synth and audio buffs today, the ladder filter design is a highly requested circuit.


Doepfer A-120 accurately emulates the transistor ladder circuitry and brings that circuit to the eurorack format. A120 features the same 24dB slope and low pass state, but adds three summed CV inputs. Each CV inputs can control the cutoff of the filter,  the overall signal is summed so anything from fast audio rate to slow evolving modulation of the filter is possible.


Doepfer has squeezed in the classic smooth Moog sound into a slim 8HP format. An ideal tool for any sound design or synthesis application, especially when you consider that this filter will also self oscillate.


The main features of the Doepfer A-120 Low Pass Transistor Ladder Filter Module include


24dB low pass transistor ladder inspired by early Moog circuits


Pure analogue signal path


Three CV inputs for a wide variety of sound capabilities


8HP wide


Requires 30mA

Short Description

The Doepfer A-120 is a 24dB Transistor Ladder Filter Module, inspired by the Bob Moog ladder filter design.

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Manufacturer Doepfer
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