A few pictures of my new LF vector network analyzer
2nd order Low Pass Filter....BODE:
2nd order Low Pass Filter....Black-Nichols:
Homemade Nyquist Filter....Bode:
Homemade Nyquist Filter....Nyquist:
Impedance of a wide-band high speaker:
Frequency response of a closed box system:
2nd order Low Pass Filter: delay time (green)
My hybrid and pseudo-numeric bass audio crossover