yes, there's nuance about volts and current (resistance); but this is a question about principle not about some specific real-world speaker.\n\nThe basic question is, all else being equal, how does power draw scale as more frequences are added at a given volume. Does this depend on how far apart the frequencies are? I mean: would 1000hz and 1001hz sum similarly to 1000hz and 5000hz (assuming a flat-resistance speaker)? What does that math actually look like (even heavily simplified)?\n\nSurely I don't need 1000w to reproduce 1000 frequencies at 90db.\n\nIf the impedance was constant, then yes you would. However the sound would be impossibly loud, and burn out the driver fast.