The main window gives a amplitude output in the frequency space. Kfilter is able to merge all simulations (volume,circuit, speaker) in one common output graph. Furthermore it is full scalable. The vector orientated lines are buffered internally. This makes it very fast while resizeing the output window.

In this example there is a example of a four way speaker system. Because the bass speaker is build in a bassreflex box, there are two impedance peaks. The left one is lower than 20 Hz and therefore not full visible. The hight frequency tweeter is not really linear. Kfilter was used to estimate a frequency correction crossover system.