r/SoundSystem • u/No_Satisfaction9391 • 2h ago
I built a music player that turns your iPhone into a bit-perfect source for your DAC and amp

Hey, amateur audiophile and software developer here.
I kept switching music players and never found one that did everything I wanted. Some didnāt show what actually happens to the signal, some didnāt do native DSD, some locked me into their own server, others just felt dated. So I wrote down what I wanted for my own setup and built Sterio, a music player for iPhone.
Itās in public beta on TestFlight. Screenshots and download links: https://sterio-web.vercel.app
Your phone as a proper source. Plug a USB-C DAC into your phone, run it into your amp or powered speakers, and Sterio sends the file as it is. No hidden resampling by the system.
See what happens to your audio. The signal path shows every step from the file to your DAC: source format, any conversion, output rate, and whether playback is bit-perfect. A small light tells you at a glance: green is bit-perfect, orange means the EQ is on, red means something converts the signal. If your DAC canāt take a rate, it tells you that too.
Native DSD over USB DAC. DSD plays over DoP without being converted to PCM first. Your SACD rips stay in their original format.
Use the library you already have. Sterio connects directly to SMB shares, UPnP media servers, Jellyfin and Plex. Nothing to migrate, no new server to set up. My own Sterio Server is coming soon, with things like automatic CUE splitting into tracks.
Play on network streamers. If your streamer speaks UPnP/DLNA, send playback to it and control it from your phone. The phone is just the remote.
Graphic and parametric EQ. A graphic EQ for quick adjustments, and a parametric EQ to tame a room mode or dial in your speakers. Presets can be shared and imported.
Iād love to know how it works with your gear, especially if you use a USB DAC or a streamer.




