ABRASIVE-20 FILTER

ABRASIVE-20 FILTER is an unique low/high pass filter based on MS20 filter clone by Doepfer's.

It is sold individually and as part of QUAD BUNDLE and Filter Bundle.

It has different audio inputs for low and high pass, but only one audio output.

Two separate audio inputs for lowpass (LP) and highpass (HP) with separate level controls are available.

The sockets are normalled, i.e. the signal applied to the LP input is available for the HP input too provided that no plug is inserted into the HP input socket.

The level control of the HP input can be used as an attenuator or polarized input control depending on the first switch selection.

This means that the signal can be added with the same polarity (+ range) or opposite polarity (- range) compared to the LP input.

This feature enables notch (+) and bandpass (-) filter functions too.

The independent control for each diode (CL+, CL-) allows asymmetrical limiting/amplification that causes a completely new and sometimes very strange behavior.

A dedicated switch to select when to apply such clipping : pre-filter, post-filter or both.

DC/AC switch to select between DC or AC coupled output.