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Chicago's AES Section - Meeting Notice (November 28, 2018)

Please forward this notice to interested friends and colleagues.
Members, non-members, and students are welcome.


“Electrostatic Drivers for Earphones: Navigating the Potholes"


Roger Grinnip
Principal Acoustical Engineer at Shure Incorporated

Wednesday, November 28, 2018

7:30 pm (Optional dinner at 6:30 pm)

Shure Incorporated, 5800 W. Touhy Ave, Niles, IL 60714

Enter at the employee entrance on the east side of the building and register at the guard desk. A valid driver's license (or government-issued photo ID) must be presented at the guard desk when registering.


Dinner (optional, but please RSVP) will begin at 6:30pm.

Contact Giles Davis ( by Tuesday, November 27th if you would like to join us.

Pizza and salad from Lou Malnati's will be provided. Please let Giles know if you have a preference for vegetarian, gluten-free, etc.

Price is $10 for non-members and $8 for members and students (please bring cash).


Driving:  When arriving by car, approach from the east by heading west on Touhy, then turn right into the parking lot just east of the Shure building, which is on the corner of Touhy and Lehigh. DO NOT turn left into parking lot from Touhy heading east, as this is illegal and you may get a traffic ticket.

CTA Blue Line:  Get off at Jefferson Park transit center, and take bus lines 85A, 225, or 226 to Shure (be sure to check the bus schedules for return trip).

CTA Red Line:  Get off at Howard and take bus line 290 to Shure (be sure to check the bus schedules for return trip).


“Electrostatic Drivers for Earphones: Navigating the Potholes"

Electrostatic transducers are mechanically simple and can provide a number of performance benefits when used in acoustic applications.  However, electrostatic transducers carry a stigma, are viewed as exotic, and have not found mainstream acceptance except in condenser/electret microphones.  To most, the complication seems to stem from the unique electrical requirements, but a close look at the basic operation uncovers additional complications that can impede the performance benefits.  To shrink the electrostatic transducer down to an earphone driver, with optimal performance, requires recognizing these “potholes” and finding the path to compromise.


Roger Grinnip, Principal Acoustical Engineer at Shure Incorporated
Roger Grinnip is a Principle Engineer with Shure Incorporated.  He’s been with Shure Incorporated for 17 years and worked exclusively on acoustical transducers, with his most recent designs ultimately becoming the KSM8 dynamic microphone and the KSE1500 electrostatic earphone.  His interests include physical acoustics, structural acoustics, computational acoustics, (a little bit of) circuit design, and most other things related to electroacoustic systems.


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