Nick recently built a simple second order Butterworth lowpass filter for his home stereo. Although the system preforms pretty well, Nick is an overachiever and hopes to improve the system performance. Unfortunately, nick is pretty lazy and doesn't want to design another filter. thinking twice the filtering gives twice the proforamce," he suggests filtering the audio signal not once or twice with a cascade of 2 idential filters. his overworked, underpaid signals professor is skeptical ans states, " If you are using idential filters, it makes no difference whether you filter once or twice!" Who is correct? Why?