Any 2-way(or more)speaker has the high and low frequency sections separated at the latest when the signals enter the crossover. Using dual inputs with the connecting bar removed, the separation point is simply moved back from inside the enclosure to the output terminals of the receiver. This makes no electrical difference as to impedance or anything else of significance.
If two 120 watt amplifiers are connected to separate sections of a speaker, the maximum available to either section is 120 watts, not 240 watts.
So help me out here...If I chose to power the top and bottom of my m80's with 2 separate amps I couldn't change or wouldn't change the low frequency low impedance line as it shows on the graph?When I read somehwere that impedance was a function of the number of drivers I made an assumption I could alter it by separating them in a bi amp configuration.Now with what yu are saying it looks to me that it is being set/controlled in the crossover itself.
