I recently got hold of 3 Klark dn332 stereo eq's that sound a little weird when engaging the 30 hz high pass filter. After opening the units i see that they have all been modded around the filter. Some components removed completely and others substituted i think. 

I want to return them to their original state, but the otherwise very nice operating manual doesn't give any info on component values. The filter is a 3rd order butterworth/Sallen-Key high pass filter (18 dB/octave) and i've attached a picture of the schematic (outtake) from the manual.

Does anybody have the full service manual/schematics or maybe an original unit to open up and check ? Would love to know the original values of the components shown on the picture.

Any help is much appreciated :)

all the best
Lauritz, DK
« Last Edit: March 12, 2020, 06:46:44 PM by lauritz »


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