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Headphone sound pressure level?

Dear all,

We have a set of Sennheiser HD 280 pro headphones with a "sound pressure level" of 102 dB "as per IEC 268-7". Since it also states a sound pressure level of 113dB/1V rms, we are unsure exactly what the maximum output level of these headphones actually is. The impedance is 64ohm. Would anyone know how to calculate this, or does anyone have access to the full international standard for headphones (e.g., IEC 60268-7), a preview of which can be found at the link below?


Thanks, Gemma