An acoustic coupler for the measurement of supra-aural audiometric earphones in the frequency range from 125 Hz to 8 000 Hz. The acoustic coupler can be used as an objective and reproducible means of measuring the output of supra-aural earphones. It can be used for specifying reference equivalent threshold sound pressure levels for the calibration of audiometers.

Model	AWA6160	AWA6161A	AWA6162	AWA6163A
Name	Ear Simulator	Acoustic coupler (2 cc)	Ear Simulator	Acoustic coupler (6 cc)
Fulfils Standard	IEC 60318-1:2009	IEC60318-5:2006	IEC60318-4:2010	IEC60318-3:2014
Frequency Range	20Hz～16,000Hz	125 Hz～8,000 Hz	20 Hz～10,000 Hz	100 Hz～8,000 Hz
Frequency Response	≤±1 dB	≤±0.5dB(200Hz～5,000Hz)       ≤±1dB(125 Hz～8,000Hz)	≤ ±0.5dB(200Hz～5,000 Hz) ≤±1 dB(20 Hz～10,000 Hz)	≤ ±0.5dB(200Hz～5,000 Hz) ≤±1 dB(100 Hz～8,000 Hz)
Used with Microphone	Model AWA14426 (1/2 inch pressure field Microphone)	Model AWA14422D (1/2 inch pressure field Microphone), also 1 inch pressure field Microphone	Model AWA14424D (1/2 inch pressure field Microphone)	Model AWA14412 (1 inch pressure field Microphone)
Used with Preamplifier	Model AWA14604 preamplifier (BNC) or AWA14601 preamplifier
Operation Voltage Range for the Preamplifier	12 V～36 V
Length of cable	2 m
Uses	The ear simulator for the measurement of supra-aural and circumaural earphones (used for example in audiometry and telephonometry) applied to the ear without acoustical leakage, in the frequency range from 20 Hz to 10 kHz. The same device can be used as an acoustic coupler at additional frequencies up to 16 kHz.	An acoustic coupler for loading an earphone or hearing aid with a specified acoustic impedance when determining its physical performance characteristics, in the frequency range 125 Hz to 8 kHz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e.g. ear moulds or similar devices.	An occluded-ear simulator intended for the measurement of insert earphones in the frequency range from 100 Hz to 10 000 Hz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e.g. ear moulds or similar devices.	An acoustic coupler for the measurement of supra-aural audiometric earphones in the frequency range from 125 Hz to 8 000 Hz. The acoustic coupler can be used as an objective and reproducible means of measuring the output of supra-aural earphones. It can be used for specifying reference equivalent threshold sound pressure levels for the calibration of audiometers.
Model of Earphone	Radio Ear DD65V2 earphones, Sennheiser HDA280	IP30 insert earphones, ER-3A insert earphone	IP30 insert earphones, ER-3A insert earphone	Beyer DT48 with flat cushion, Telephonic TDH39 with MX41/AR(or model 51) cushion, Telephonics TDH 49/50, Sennheiser HAD 280, RadioEar DD45