When maximum performance is demanded from communicationssystems, test equipment, or any other frequencysensitive systems it is imperative to get the point where thefilter response is -3dB (the breakpoint of the low pass filterplaced exactly right. Placing the breakpoint correctly insuresminimum distortion in the pass band, while yielding maximumattenuation of unwanted frequencies in the stop band.This is very hard to do in multiple frequency systemsbecause when the break frequency is placed correctly forone task, it is usually by definition,