There is a misconception that an amplifier "pushes" power to the speakers. The physics is that the amplifier output voltage varies (up to it's maximum) and there is an output current limit.

It's really no different from an AC power circuit or a 70V line. A certain voltage is available and each connected device draws some current. For example, on a 120VAC power line, a certain current is available, perhaps 15A. We can keep adding lamps until we reach the 15A limit.

The difference between a lamp circuit and our speaker circuit is that the lamp circuit operates at a constant voltage and our amplifier's output voltage varies with the Volume control setting and the musical content.

In our speaker circuit there are two limits -- the maximum current the amplifier can deliver and the maximum voltage that the speakers can handle. In a lamp circuit we can dim a lamp (operate at a lower voltage than the lamp is rated), but if we supply a higher voltage than the lamp rating, the lamp dies.

Part of the problem is the math that we use for our speaker circuits. If we used the same math approach for AC power circuits, we'd be struggling to figure out how many 144 Ohm lamps we could stack on our 1800 watt power line.