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Apple in-ear ME186 measurement

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speakerphone:














​My artificial Ear (Coupler) follows IEC 60318-4 (former IEC 60711), ITU-T Recommendation P.57, ANSI S3.25 standards.​

References
IEC 60318-4 : Electroacoustics - Simulators of human head and ear - Part 4: Occluded-ear simulator for the measurement of earphones coupled to the ear by means of ear inserts
http://webstore.iec.ch/webstore/webstore.nsf/artnum/043703!opendocument

ITU-T Rec. P.57 : Series P: Telephone transmission quality, Objective measuring apparatus : Artificial ears
http://www.itu.int/rec/T-REC-P.57

​​ANSI/ASA S3.25 : Occluded Ear Simulator
http://webstore.ansi.org/FindStandards.aspx?SearchString=s3.25&SearchOption=0&PageNum=0&SearchTermsArray=null%7cs3.25%7cnull

IEC 60268-7 : Corrigendum 1- Sound system equipment - Part 7: Headphones and earphones
http://webstore.iec.ch/webstore/webstore.nsf/artnum/043714!opendocument

ISO 11904-2 : Determination of sound immission from sound sources placed close to the ear
http://www.iso.org/iso/catalogue_detail.htm?csnumber=32439

​Olive-Welti Target : Listener Preferences for In-Room Loudspeaker and Headphone Target Responses
http://www.aes.org/e-lib/browse.cfm?elib=17042

Jay_WJ:
Impressive measurement setup!

A quick question. What are the current IEC standards for headphone non-linear distortion measurement? A quick summary?

speakerphone:

--- Quote from: Jay_WJ on April 05, 2015, 11:05:23 PM ---Impressive measurement setup!

A quick question. What are the current IEC standards for headphone non-linear distortion measurement? A quick summary?

--- End quote ---
Refer to IEC 60268-7, Non-linear distortion should be measured under reference condition, known as IEC 60318-4 with 94dB SPL @ 500Hz, or 1mW amplifier output. Also THD, 2nd and 3rd harmonic is available in this standard.

Jay_WJ:
Thanks! 94 dB @ 500 Hz seems reasonable, but I do not see a sensible reason why a fixed input power should be used. All transducers are different in their efficiency.

speakerphone:

--- Quote from: Jay_WJ on April 14, 2015, 02:52:55 PM ---Thanks! 94 dB @ 500 Hz seems reasonable, but I do not see a sensible reason why a fixed input power should be used. All transducers are different in their efficiency.

--- End quote ---

I can't agree more. So I use 94dB @ 500Hz .

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