When do I need to use the Type 2 Adapter for circumaural earphones?
Type 2 Adapter for circumaural earphones
You need the AEC201-2 Type 2 adaptor for circumaural earphones only for KOSS HV/1A type earphones.
The Type-2 adapter is the flat crenellated adapter plate converting the Acoustic Coupler for use with Circumaural Earphones. This adapter is mentioned in ANSI S3.6 (2010) and in ISO 389-5 for use with the KOSS HV/1A earphones.
From ANSI S3.6 (2010) we have the following:
The IEC 60318-1 (2009) no longer mentions the crenellated Type 2 adapter. (IEC 60128-1 and IEC 60318-2 have been merged into IEC 60318-1(2009).) ISO 389-5 for the HF RETSPL in Annex B shows again the crenellated adapter for KOSS HV/1A
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