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INTRODUCTION
Congratulations on the purchase of your new E-A-RTONE
®
3A Insert Earphones. Whether you are performing hearing screening in
an educational or industrial setting, testing related to the fitting or evaluation of amplification, audiological research, or
comprehensive diagnostic assessment, E-A-RTONE
®
3A Insert Earphones provide many advantages that can enhance test reliability
and minimize or eliminate problems frequently encountered with supra-aural headphones.
Because the subject’s external canal is sealed with an E-A-RLINK
®
foam plug, which functions as a sound delivery system while at
the same time attenuating ambient noise, reliable threshold measurement can be accomplished in environments previously unsuitable
for hearing testing.
Direct coupling also produces much greater sound separation between ears across the test frequency range. Clinically, that means
more instances where the need for masking is eliminated, or the level necessary for effective masking is lower. Your average testing
time will decrease without sacrificing reliability. The method of clinical masking you use does not need to be altered. Simply
substitute the greater inter-aural attenuation values cited in the Obtained Interaural Attenuation table in section 1. of this booklet.
E-A-RLINK
®
foam plugs are available from your distributor in three sizes; a standard (3A) plug that will comfortably fit most adult
ear canals, a pediatric (3B) size for small canals, and an extra large (3C) size for very large or surgically altered ear canals.
Disposable plugs also insure that sanitary conditions exist for each of your patients, and that periodic cleaning of a headband or
cushion is no longer required.
The E-A-RTONE
®
3A Insert Earphone is offered with three levels (10V, 50V, & 300V) of impedance to match the output of most
commercially available audiometers. Your distributor or Auditory Systems can help you determine which version is appropriate for
your equipment.
E-A-RTONE
®
3A Insert Earphones were designed to mimic the frequency response of the TDH type earphone. It is strongly
recommended, however, that the (RETSPL) values and procedure cited in the ANSI S3.6 - 1996 Standard be used in recalibration,
before initial use, unless your audiometer was purchased with an E-A-RTONE
®
3A as the standard transducer, and at least annually
thereafter. Measured correction factors can be applied in those cases where it is necessary to alternate between an insert earphone
and a supra-aural earphone.
This instruction booklet is intended to provide information to allow you to perform hearing testing with your audiometer and E-A-
RTONE
®
3A Insert Earphones with the confidence that results will be comparable to, or in certain instances more reliable than,
measurements performed with supra-aural headphones. Most questions regarding use and calibration of E-A-RTONE
®
3A Insert
Earphones can be answered by reviewing this booklet and/or ANSI S3.6-1996. For information regarding replacement items, please
contact your distributor or Auditory Systems Customer Service at 800/624-5955. Requests for technical assistance, or comments
regarding E-A-RTONE
®
3A Insert Earphones and E-A-RLINKS
®
should be directed to Aearo Company Auditory Systems at
317/692-6550.