Either unprofessional or dishonest – Radsone Hi-Res Player Review

I am an analog integrated circuit engineer as well as an audiophile, and I think I have a say to this. In short, despite all the other 5 star reviews, the app publisher is cheating. 1. When I am playing a 192kHz/24bit media file, and connected to my SONY PHA-3 headphone amplifier, the Hi-Fs indicator is NOT activated. The amplifier can detect input data format, and if it is of 96kHz/24bit or higher resolution, it will light up the Hi-Fs indicator. So, in conclusion, the app is not generating Hi-Res digital output. 2. The maximum sample rate/bit depth support by iPhone 7 plus, in terms of HARDWARE, is 48kHz/24bit. So it is theoretically impossible for the app to output any analog signal better than 48kHz/24bit. However the publisher claims it can playback 192kHz/24bit. The DSP available in their IAP will make a noticeable difference but it is not necessarily better sound quality. So don't get tricked.
Review by 虾膜江 on Radsone Hi-Res Player.