Wayne's World

Jul. 25, 2011

When High Noise Levels are NOT the Issue! (Part I)

Wayne Staab
A few days ago I accompanied a couple of jeeping friends, Jim Beller and Paul Furr of St. George, UT to the Hurricane Mesa Test Track (HMTT) Facility a few miles from where we live.  It is currently owned and operated by Goodrich Corporation, Universal Propulsion Company, but was started in the mid 1950s by the US Air Force. Located
Jul. 17, 2011

TK Control, WDRC, and Expansion (How they are used and compared in fitting hearing aids)

Wayne Staab
Of topics that are confusing to many who fit hearing aids are the distinctions between the TK Control, WDRC, and Expansion. Understanding the differences between these and how they are used for providing appropriate amplification is a critical part of hearing aid selection and consumer satisfaction.   Basics Basic definitions to help in understanding these differences: 1. Linear Amplification: 1:1
Jul. 13, 2011

Deep-Fitting Hearing Aid Real-Ear Measurements: Easy, Accurate, Consistent

Wayne Staab
Why Perform Real-ear Testing? The reason for hearing aid real-ear measurement is to determine the actual amplification of the hearing aid as worn on the head of the user. As is known (and reviewed in the 7/6/2011 blog), coupler measurements produce varying results, depending on how they are made. Real-ear results are not the same as measured using hearing aid
Jul. 06, 2011

RIC Hearing Aid Coupler Measurements

Wayne Staab
Introduction RIC (receiver-in-canal) hearing aids have become very popular over the past few years.  However, electro-acoustical coupler measurements of such instruments to properly suggest how they perform on the real ear have not been standardized.  So, how are RIC coupler measurements made and what do they tell us? For RIC instruments, especially those that use occluded coupling, the use of
Jun. 29, 2011

The Origin of Hearing Aid Manufacturing in Minneapolis/St. Paul

Wayne Staab
In the 1960s it was estimated that the United States had approximately 40 companies identifying themselves as hearing aid manufacturers.  The greatest number were located in Minneapolis, MN and as a result, Minneapolis/St. Paul was often identified as the hearing aid capital of the world, and still today, as the hearing aid capital of the United States. And although Minneapolis/St.
Jun. 22, 2011

RIC Speaker Link Replacement/Consistency of Performance

Wayne Staab
A Case For Extra Speaker Links For The Consumer Some RIC (Receiver-in-the-Canal) hearing aids allow for the speaker link to be removable (Figure 1).  This has significant advantages to both the user and to the dispenser because when a problem occurs with the hearing aid, it is more likely a speaker link problem than a problem with the processing device. 
Jun. 15, 2011

Hearing Aid Evaluation/Rating Scales

Wayne Staab
Throughout the years numerous evaluation/rating scales have been conducted to determine patient/subject reaction to hearing aids – from comfort, cosmetics, handicap, self-evaluation of hearing difficulty, performance, satisfaction, cost, benefit, etc.  Some have been validated and others have been developed for specific purposes.  Regardless, all serve a purpose. A partial list includes: Feasibility Scale for Predicting Hearing Aid Use Hearing Aid
Jun. 08, 2011

Hearing Testing in Song

Wayne Staab
Over the years many items of interest to hearing professionals have been lost or forgotten, and for others, have never been experienced.  This blog relates to an item of interest that if not presented here, may never have been known to hearing professionals. In my library is an audio tape with a couple of songs on it, and one relates
Jun. 01, 2011

Other Uses of the Decibel

Wayne Staab
The decibel (dB) is most generally associated with sound levels, especially for those of us in acoustics. However, acoustics has no sole claim to the use of this term. For example, there is no reason why the decibel could not be used to express values in frequency, weight, height, distance, the national debt, or to any measurement that has two
May. 26, 2011

Errors of the Acoustic Gain Prescribed Via Real-Ear-to-Coupler Differences (RECD)

Wayne Staab
Editor’s Note: This is an interesting concept and was introduced at the April 2011 meeting of the ANSI standard’s working group 80, now working on a revision of the S3.46 real ear standard. In this suggestion, the HA-2 coupler result is not as good as the HA-1, especially when using the same custom earmold that would be used in the