Take a look at a job description from one of the big acoustics manufacturers:

• Develop, implement and evaluate the performance of potential new hearing instrument design using electrical and acoustic testing systems.
• Evaluate performance of electro-acoustic components for potential use in hearing instruments. Develop electro-acoustic test specifications for hearing aid devices and the components used in those devices.
• Develop and document hearing instrument performance data used in software fitting systems and marketing materials.
• Troubleshoot electro-acoustic design, assembly and component problems with existing products and implement corrective measures.
• Generate engineering documentation required to manufacture new products reliably and with high quality.
• Qualified applicants possess Bachelors of Science in Electrical Engineering (BSEE) or Physics, 2 years of professional electrical engineering design experience with emphasis on acoustic design. Advanced degree (M.S., PhD.) in Electro-Acoustic engineering will be considered. Experience with electro-acoustic transducers is preferred. Background in analog or digital signal processing is a plus. Strong computer skills. Problem solving abilities, good judgment, verbal and written communication skills, planning and organization, and blueprint reading are essential.