Measurements of the C3 impedance show that it has a low of 4 Ohms at 200 Hz, and a high of about 20 Ohms at 75 Hz and 2.6 kHz. The tuning frequency is at 40 Hz. where the impedance dip is located. The peak between 2 and 3 kHz is due to the crossover network. Electrical phase shows that it is mostly capacitive below 200 Hz, and mostly inductive above 200 Hz. The electrical phase is computed against a defined phase of 00 for resistive impedance (the horizontal line in the middle of the graph, marked as "0" in the right hand column). So, for example, at 1 kHz, the phase is about + 370 with respect to the resistive impedance phase. Negative phase is capacitive, and positive phase is inductive. The small notches in the phase curve are probably due to resonances.


Copyright 2002 Secrets of Home Theater & High Fidelity
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