For speakers rated at <1 W, SPL is measured at normal input power at a distance of 0.5 meters. This testing protocol is indicated on our datasheets as Nor.P/0.5 M
For speakers rated at 1 W or greater, SPL is measured at 1 W at a distance of 0.5 meters. This testing protocol is indicated on our datasheets as 1 W / 0.5 M.
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