No doubt elevick's math is correct, however there is more to consider. Those SPL's are at 1m, and the further away they decrease, but there's 2 speakers and room gain. If it's a 4 ohm speaker, the sensitivity spec is at 2 watts unless it states 1 watt. If nothing is stated or it says 2.83v, then 2 watts, so a 1 watt rating is 3db lower. The power necessary is for a maximum peak SPL, not the average. Depending on the type music, some peaks can be as much as 20-25db higher than the average.
The recommended minimum power of this speaker being 40 watts is likely due to it's varing impedance, 8 ohms nominal, 2.9 ohms minimum. But that wattage spec can be misleading as well. I'm sure a 30 watt Pass would have no trouble, where as a budget 100 watt receiver would struggle.
The recommended minimum power of this speaker being 40 watts is likely due to it's varing impedance, 8 ohms nominal, 2.9 ohms minimum. But that wattage spec can be misleading as well. I'm sure a 30 watt Pass would have no trouble, where as a budget 100 watt receiver would struggle.