Here’s the review of viable PSAPs from the article:
Dr. Reed has tested just 29 participants so far, he cautioned, and real-world results will vary. Still, he and his colleagues were impressed with three P.S.A.P.s.
The Soundhawk, which operates with a smartphone, performed almost as well as the hearing aid, with a list price of $399. The CS50+, made by Soundworld Solutions, and the Bean T-Coil, from Etymotic, worked nearly as well and list for about $350.
The researchers also tested the MSA 30X, available at drugstores for $30, and found it actually increased distortion. “A pure waste of your money,” Dr. Reed said.
All three are large, butt-ugly products.