May I hijack this thread for a few post? I would like to pick Al's brain, I hope to the benefit of all.
Most speakers do not have similarly flat impedance magnitudes, and most speakers have impedance phase angles that reach considerably negative values (i.e., considerably less than 0 degrees, meaning they are capacitive) at some frequencies.
Al or anyone, could you explain how the impedance phase angle impacts the system (amps, cables, speakers)?