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- Order number: 120081
- Depth: 75
The A-108 is a classic Moog lowpass filter with up to 48dB slope and a very soft and round sound. There are four lowpass outputs for 6, 12, 24, 48dB and also a banpass output.
Internally the A-108 is a 8-stage low pass filter with different slopes available: 6, 12, 18, 24, 30, 36, 42 and 48 dB per octave and in addition a band pass output.
By default the 4 low pass outputs of the A-108 are internally connected to the filter stages 6, 12, 24 and 48dB as there seemed to be the best output combination generating different sounds. E.g. the audible difference between the 48dB and 42dB or between 42dB and 36dB is very little.
But if desired any of the filter stages can be connected to one of the outputs by changing the internal connections (jumpers or wires). Each of the filter stages can be used but only four at a time. Even a multi-way switch could be used.
Resonance (Emphasis or Q ) can be adjusted manually right up to self-oscillation, in which case the filter will behave like a sine wave oscillator. The A-108 features an external feedback input that enables the insertion of additinal modules into the feedback path (e.g. VCA for voltage controlled resonance or phaser/frequency shifter for phase/frequency shifting effects). The socket is normalized and internally connected to the 48dB low pass output if no cable is inserted into the feedback socket.
A-108 auf Doepfers Webseite;http://www.doepfer.de/a108.htm; Bedienungsanleitung (pdf);http://www.doepfer.de/a100_man/a108_anl.pdf; Klangbeispiele;http://blog.andreaskrebs.de/2010/04/29/doepfer-a-108-6122448-db-lowpass-example/
WIth a long trajectory building synths, MIDI keyboards and designing bespoke devices for music pioneers Kraftwerk, Dieter Doepfer decided to design his own modular synthesizer in 1995 based on existing electrical and mechanical specifications of lab equipment he used during his years at university. The official presentation of the system at 1996 Frankfurt Musikmesse caught everyone by surprise and created lots of interest. After Doepfer published the specifications on his website, many instrument designers and engineers saw the potential of the new Eurorack format. Doepfer continues expanding their catalog of over 200 modules (and counting), operating from their modest offices in the outskirts of Munich.