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Doepfer Musikelektonik logo

Analogue  Modular  System  A-100

Width

HP

Depth

mm

Current

mA

Lighning Flash

Owners Manual

Fixed Filter Bank

The A-128 is a fixed filter bank made up of 15 parallel band pass filters, all with fixed middle frequencies and bandwidth but variable gain.


50Hz ~ 75Hz ~ 110Hz ~ 150Hz ~ 220Hz ~ 350Hz ~ 500Hz ~ 750Hz ~ 1.1KHz ~ 1.6KHz ~ 2.2KHz ~ 3.6KHz ~ 5.2KHz ~ 7.5KHz ~ 11KHz


The bandwidth of each of the filters is approximately half an octave. The signal at the output of the A-128 contains a mix of all the filters depending on the position of each one’s amplitude control knob.

The filter bank’s main job is to emphasise individual sections of the whole audio frequency range.


A-128

20

60

10HP

20

10HP

A-128  

Doepfer A-128