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Active Filter Unit

The Active Filter Unit was an add-on for the Project 60 modular hi-fi system. It was designed to eliminate unwanted frequencies above or below ("scratch" or "rumble") a specific cut-off frequency, thus improving the overall quality of the sound output. It incorporated two Sallen & Key type active filter stages, providing a high pass (scratch) and low pass (rumble) filter for output from the Project 60's twin amplifiers.



  • Launched:
    June 1970
  • Price:

Active Filter Unit advert
(162 Kb)


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Chris Owen 1994-2003