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It's very simple, but people overlook what the words resistance and impedance mean. A speaker resists (makes it more difficult, if you will) the flow of electricity, how much it resists in measured in ohms and expressed either as resistance, or impedance. Both are essentially the same, but resistance refers to DC, and impedance to AC.

This is an oversimplification, but it's useful.

An amp outputs power. How much power is determined by how difficult the speaker makes it (impedance). Low impedance means the speaker doesn't make it that difficult, so the amp can easily send a lot of power. SO, as mentioned, the speaker determines the amps output. The frequency that a capacitor blocks is determined by the impedance, so an 8ohm tweeter and a 10uf cap would result in roughly a 2khz high pass. If you put a 4 ohm tweeter in it's place then the high pass will become 4khz.
 
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