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INTRODUCTION
Congratulations on the purchase of your new E-A-RTONE
®
5A Insert
Earphones. The E-A-RTONE
®
5A was designed to retain all the advantages
of the E-A-RTONE
®
3A Insert Earphone, and provide additional features. The
front tubes that conducted sound from the body level transducer of the 3A
model to the ear canal, and the tubing or "plumbing" within the transducer
case have been eliminated. The result is an insert earphone that provides
ear-level sound transduction, a wider frequency response, and greater
reliability.
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
®
5A 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 on page 4 of this booklet.
E-A-RLINK
‚ couplers are available from your distributor in five sizes, three
®
foam tips and two small PVC tips for infant testing. The standard (3A) foam
plug will comfortably fit most adult ear canals, a smaller (3B) size is
appropriate for pediatric testing, and an extra large (3C) size can be used to
couple the E-A-RTONE
®
Insert Earphone to very large or surgically altered
ear canals. To accommodate EACs too small for the 3B tip, 3.5mm and
4.0mm PVC "Infant Eartips" are now available for your youngest patients.
Disposable plugs insure that sanitary conditions exist for every test you
perform, and that periodic cleaning of a headband or earphone cushion is no
longer required.
The E-A-RTONE
®
5A Insert Earphone is offered with two levels (10 and 50 )
of impedance to match the output of most commercially available
audiometers. If you require a 300 insert earphone, the E-A-RTONE
®
3A is
1
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