“…This has been possible due to the convergence of traditional hearing aids, which are medical devices, with consumer audio devices, creating a whole array of hybrid devices such as Personal Sound Amplification Products (PSAPs) and hearables. Currently, there are several hearing devices on the market, of which some are medical devices intended for individuals with hearing loss and regulated by the FDA (i.e., prescription hearing aids, self-fitting OTC hearing aids, pre-set OTC hearing aids), and other devices that serve as hearing enhancement devices for individuals with normal hearing who have an average hearing thresholds of 25 dB or better in frequencies 500 Hz, 1,000 Hz, 2000 and 4,000 Hz (i.e., PSAPs, hearables) or those used mainly for entertainment purpose (i.e., consumer audio devices) ( Manchaiah et al, 2023 ) ( Figure 1 ). Some manufacturers are blurring the lines between these categories and offering sound enhancement and personalization of acoustic output for persons with hearing loss using smartphone-based earphones with an accompanying smartphone app ( Lin et al, 2022 ).…”