@perkri
Your example of the ESL is an Electrostatic speaker. The op is trying to learn how to read impedance chart of a loud speaker. Duke did give an excellent representation of how a solid state amp reacts to a speaker load vs a tubed amp. Which also shows why impedance compensation on a speaker design can be helpful.
Your analysis of a crossover design can be true of how it effects a impedance curve, but this is normally due to how an inductance coil reacts to the EM field and natural inductance of the drivers. Depending on drivers, it may be very beneficial to use a series or parallel design based on crossover point and what type of inductors are needed. But for the op's question and in general learning to read an impedance chart, my original response is less confusing for that purpose.
Your example of the ESL is an Electrostatic speaker. The op is trying to learn how to read impedance chart of a loud speaker. Duke did give an excellent representation of how a solid state amp reacts to a speaker load vs a tubed amp. Which also shows why impedance compensation on a speaker design can be helpful.
Your analysis of a crossover design can be true of how it effects a impedance curve, but this is normally due to how an inductance coil reacts to the EM field and natural inductance of the drivers. Depending on drivers, it may be very beneficial to use a series or parallel design based on crossover point and what type of inductors are needed. But for the op's question and in general learning to read an impedance chart, my original response is less confusing for that purpose.