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the lowest ohm speaker used is the load shown to the amp?

Disregarding losses in a passive network if you have a 4 ohm mid crosssed over below 3kHz and an 8 ohm tweet crossed over above that then at frequnecies below 3kHz the amp sees a 4 ohm load and above 3kHz sees 8 ohms. At frequencies at or around the crossover point strange things begin to happen as both drivers are playing at the same frequencies. However the amp may actually see about the same impedance due to the added impedance the caps and coils provide around the cutoff frequency or frequencies.

-Fishy

with separates, the amplifier sees the load of the individual speaker at the frequency range that speaker covers. Different speakers with different loads will mean the amp will see different loads at different frequency ranges.

Consider my '94 Jeep that ran the single 2125SX amp (2 channel) for front separates, rear coaxials, and two subs. Same situation but a bit more involved. same result though. different loads at different ranges at the same time.

Ahh I get it now :)

that makes sense now. Thank you all for very thorough yet simple responses =).