Marshall Chasin

Marshall Chasin, AuD, is an audiologist and the Director of Auditory Research at the Musicians’ Clinics of Canada, Adjunct Professor at the University of Toronto (in Linguistics), Associate Professor in the School of Communication Disorders and Sciences at the Western University. He is the author of over 200 articles and 7 books including Musicians and the Prevention of Hearing Loss. Dr. Chasin has been the recipient of many awards over the years including the 2012 Queen Elizabeth II Silver Jubilee Award for service to Canada and the Canada 150 Medal in 2017. He has developed a new TTS app called Temporary Hearing Loss Test app.

Weber’s Law…. well, almost… well, maybe not…

Marshall Chasin

I received this comment to an earlier blog on Weber’s Law from Dr. Brian Moore in the UK…. ‘Reducing the stereo volume from 60 dB to 55 dB may be quite noticeable, but barely noticeable if one were to reduce the stereo volume from 90 dB to 85 dB.’ … This is a mis-interpretation of Weber’s law. A reduction in

A simple music environmental strategy for (high school) bands.

Marshall Chasin

A performance stage is an amazing piece of architectural and acoustic design. All locations on the stage need to be visualized from as many points in the audience as possible, and the sound level emanating from every part of the stage needs to have similar characteristics. Very soft “pianissimo” sounds need to be audible, and very loud “fortissimo” sounds needs

How can the Weber Law help us counsel musicians?

Marshall Chasin

The Weber Law (pronounced VEY-ber) has been around for about 175 years. Also called the Weber-Fechner (pronounce FEK-ner) Law after one of his students gave it its mathematical underpinning, this is a law that attempts to summarize some of our perceptual attributes, such as loudness. Simply put, the Weber Law states that the just noticeable difference is a constant ratio

Modifications for the ER-15 earplug

Marshall Chasin

The ER-15 earplug was the first to have uniform attenuation and it has been commercially available since 1988. Its sister earplug, the ER-25 which is more appropriate for drummers and other percussionists reached the marketplace in 1992. Since that time, the ER-15 earplugs have become the mainstay of hearing loss prevention for those in the performing arts. More recently other

Rock and Roll needs to be loud… but it doesn’t need to be intense.

Marshall Chasin

Every rocker I have ever met (and I go back to the 60s) says that rock and roll needs to be loud. They are absolutely correct. To truly enjoy rock music one needs to involve all parts of the brain that respond to the visceral rush of loud music- this ranges from the Amygdala, to the Cerebellum, from the hypo-campus

Why otoacoustic omissions are useful and one thing NOT to do with them…

Marshall Chasin

Since David Kemp’s seminal article in 1978 on “Kemp’s echo”, otoacoustic emissions (OAEs) have been shown to be very useful clinically, despite the difficulty I have in spelling it correctly. Other than for infant hearing screenings OAEs appear to demonstrate hearing pathology long before an audiometric loss is found. That is, it takes a significant amount of cochlear damage to

Why do you instantly dislike trumpet players?… Because it saves time!

Marshall Chasin

Other than the title being a great joke (at the expense of our brass colleagues), there is some semblance of truth to it. Musicians (i.e. everyone in the orchestra) sit downwind of the trumpets and frequently have to bear the brunt of loud blasts on a regular basis. Other than sticking a sock in the trumpet bell, what can be

The acoustics of musical instruments: Part C#

Marshall Chasin

Welcome to part 3 of the acoustics of musical instruments (or as musicians would say, part C#)… actually I am sure that they wouldn’t say that- just trying to be funny. In the first of this blog series on the acoustics of musical instruments we discussed quarter wavelength resonator instruments such as the clarinet, and the brass section. Clarinets have

A bit on the acoustics of musical instruments: Part B flat

Marshall Chasin

This is a continuation of last week’s blog on the acoustics of musical instruments. Last week we talked about quarter wavelength resonators and these are typically the clarinet and the brass instruments. This latest blog is about the exciting half wavelength resonators- vocalists, strings, sax, flute, oboe and the bassoon. Our vocal chords are tightly held at both ends of

Some acoustics of musical instruments: Part A

Marshall Chasin

This will be the first of a three part blog on the acoustical bases of musical instruments. The other two parts will be called Part B flat, and Part C sharp… a bit of music humor there… Understanding how some instruments work help us to understand some of the comments and complaints from our hard of hearing clients. It also