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In page Loudspeaker:

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Typical home loudspeakers have sensitivities of about 85 to 95 dBSPL for 1 W @ 1 m—an efficiency of 0.5–4%. Sound reinforcement and public address loudspeakers have sensitivities of perhaps 95 to 102  dBSPL for 1 W @ 1 m—an efficiency of 4–10%. Rock concert, stadium PA, marine hailing, etc. speakers generally have higher sensitivities of 103 to 110  dBSPL for 1 W @ 1 m—an efficiency of 10–20%.[citation needed]