Easy - The lower the resistance, the more current flow can occur. Think about resistance as a water hose. The less resistance the more flow. When you have more current flow, there is more heat generated because conductors are not perfect, they also have a resistance. The amp runs hotter and requires bigger cooling heatinks, bigger caps to store all those electrons, wider electrical traces, bigger posts, etc.
More resistance is less load??
Hi, can someone explain, in "ohms for dummies" language, why a 4 ohm speaker, which has half the resistance of an 8 ohm speaker, is said to be more demanding on the amp? And the other way, why a 16 ohm speaker, with twice the resistance, is less demanding?