Re: Headphone sound pressure level? (Eric Benjamin )


Subject: Re: Headphone sound pressure level?
From:    Eric Benjamin  <ebenj@xxxxxxxx>
Date:    Wed, 13 Jul 2011 13:11:55 -0700
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

Please keep in mind that most of these specifications are only approximate in any case.  To the extent that the left and right ear phones may have significantly different sensitivity.  It's not too difficult to measure the sensitivity at low and middle frequencies by simply using a small lavalier microphone taped at the entrance to the subject's ear canals.  If you have access to a pressure microphone calibrator you can calibrate the sensitivity of the lavaliere microphone.  If not, you can at least be sure of the relative calibration of the two ear cups. Eric Benjamin ----- Original Message ---- From: Gemma Rachael Hutchinson <gemma@xxxxxxxx> To: AUDITORY@xxxxxxxx Sent: Wed, July 13, 2011 10:59:43 AM Subject: 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? http://webstore.iec.ch/preview/info_iec60268-7%7Bed3.0%7Den.pdf Thanks, Gemma


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