Power performance is often overlooked during speaker system design. With the rise of autonomous systems and the necessity of reducing global energy waste, it has become important to be able to compare and predict the power consumption of loudspeakers. The paper reviews the existing metrics---such as sensitivity and efficiency---extends them, and suggests new ones. Two new metrics that characterize power performance are introduced, which can take the power spectrum density of program material into account in order to adapt to real-life circumstances. They can be easily derived from impedance and frequency response measurements with simple maths and can be specified on loudspeaker datasheets. Used together, they allow performance comparison, power optimization, and energy source sizing. For each, benefits and limits are discussed, and a summary table allows a comparison of each metric characteristic.
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