Serving Clients In Nebraska, Iowa And South Dakota Beltone Audiology & Hearing Center. With 13 office locations covering parts of Nebraska, Iowa, and South Dakota, Beltone Audiology & Hearing Center has the ability to properly care for all your hearing needs. With 4 generations in the hearing and audiology field, family owned and operated Beltone Audiology & Hearing Center offers complete hearing services from initial hearing tests to complete fitting and customization of quality digital hearing aids.