Streamer S3 Streamer Development Log

[will williams]

Hi Fosiphiles,

We’re thrilled to kick off this thread with exciting news: S3, Fosi Audio’s first-ever network streamer, is officially in development!

Inspired by your feedback and built for music lovers who crave high-quality streaming, the S3 aims to be the perfect digital bridge between your favorite services and your Hi-Fi system. Whether you’re using Wi-Fi, Ethernet, or Bluetooth, the S3 will keep your setup flexible and future-ready.

We’re planning support for Roon Ready, TIDAL Connect, Spotify Connect, AirPlay2, GOOGLECAST, and more — all in a compact design that complements the Fosi family.

In this thread, we’ll share key updates as development progresses: hardware design, app integration, certifications, and, of course, plenty of sneak peeks.

As always, we’d love to hear your thoughts, ideas, and suggestions. Let’s build the S3 together!

Here is the rendering sketch of the S3:


Basic Specs

Input:	WiFi/Ethernet, Optical, RCA, HDMI Earc with CEC, Bluetooth
Output	RCA, XLR, OPT, Sub-Out
Trigger	Out
In-Built DAC	AKM AK4493S
APP	Download the Fosi Audio app to connect and control the S3.

 

[Cbhere]

This is great news, I am in the process of making the same by combining your products with raspberry pi based streaming software. Will be great if your team can create the same, looking forward for your product release.

 

[miketxo]

Adding a color display and a USB out like the Wiim ultra

 

[Martin Roscos]

This looks absolutely spot on. And I love the design nod to the ZD3. Excellent work

 

[will williams]

Adding a color display and a USB out like the Wiim ultra

Hi

Sorry, the S3 does not support a display at the moment. I plan to add this feature in the next-generation product.

 

[will williams]

This looks absolutely spot on. And I love the design nod to the ZD3. Excellent work

Hi Martin,

Thank you for your recognition. When we gathered feedback from everyone about the streamer, many people mentioned this point. So it’s clear that this is something we absolutely need to deliver.

​

 

[will williams]

This is great news, I am in the process of making the same by combining your products with raspberry pi based streaming software. Will be great if your team can create the same, looking forward for your product release.

Hi,
Thank you for your anticipation — we won’t let you down! I’ll be posting regular updates here on the progress of the S3 development.

 

[troythector]

It would be amazing if this device/fosi app is capable of indexing your personal music collection stored on NAS shares on your LAN or USB. I currently use Volumio on Raspberry Pi but it is clunky and slow. This feature would also set the S3 apart from other streamers in the market.

 

[D1N0##]

To be a serious streamer it needs more than an optical digital output. Coaxial and USB too. Galvanic isolation on the digital outputs. If it has an internal power supply provide a way to bypass it for a linear DC ps.

 

[will williams]

It would be amazing if this device/fosi app is capable of indexing your personal music collection stored on NAS shares on your LAN or USB. I currently use Volumio on Raspberry Pi but it is clunky and slow. This feature would also set the S3 apart from other streamers in the market.

Hi,
"Could you please share which software or app you currently use to access your NAS music collection? For example, are you using DLNA/UPnP, SMB (Windows file share), NFS, or some other method?"

"When you mention USB, do you mean USB flash drives (thumb drives), external USB hard drives, or both?

 

[will williams]

To be a serious streamer it needs more than an optical digital output. Coaxial and USB too. Galvanic isolation on the digital outputs. If it has an internal power supply provide a way to bypass it for a linear DC ps.

Hi

Thank you very much for your suggestions

 

[will williams]

Hi all,

Here is the current development progress of the S3:
1. The initial PCBA design has been completed, and we are now tuning the sound.
2. The enclosure mold is currently in production (for now, we are using a 3D-printed enclosure for prototyping )

Paired with our new powered subwoofer, it sounds amazing — haha!"

 

[troythector]

Hi,
"Could you please share which software or app you currently use to access your NAS music collection? For example, are you using DLNA/UPnP, SMB (Windows file share), NFS, or some other method?"

"When you mention USB, do you mean USB flash drives (thumb drives), external USB hard drives, or both?

So for my NAS server I use TrueNAS Scale and have my media folder shared via SMB. For my audio player I use a Raspberry Pi 3B+ flashed with Volumio Audio Player in which I am able to add network drives via NFS or SMB. Volumio will then index your local music library from the attached network share and play your music via multiple output sources (i.e. HDMI or Raspberry DAC via HAT module).

USB support could handle external hard drives and flash drives for faster access to your local music library.

 

[slerch666]

Argghhh!
I JUST bought a WiiM to do this in my setup! If I knew this was on the way I'd have waited.

Will this also offer connection to Plex? I use Plex for streaming my personal music collection and it was a big reason I went with WiiM.

I could possibly be convinced to sell my WiiM or swap it out for this...

 

[will williams]

Argghhh!
I JUST bought a WiiM to do this in my setup! If I knew this was on the way I'd have waited.

Will this also offer connection to Plex? I use Plex for streaming my personal music collection and it was a big reason I went with WiiM.

I could possibly be convinced to sell my WiiM or swap it out for this...

Hi

It is not supported yet, but I don’t think this is an issue; it is already on our upgrade schedule, and we plan to roll it out gradually via OTA updates.

 

[SeeDee]

I agree with others that digital ports are a must as well as Plex support. So long as there is bit perfect transfers of data and all the things you've mentioned, you should be successful. I am excited and waiting... perhaps patiently, perhaps not.

 

[JVWGTR]

The one killer feature I'd love to see - that's hard to find - is analog pass-through for the RCA inputs. It would be perfect if I could connect my turntable without the signal being converted to digital and back to analog to pass through

 

[Memphiskat]

Since you are using a subwoofer with it, I assume it has a subwoofer output. But does it have a selectable crossover? Lowpass for the sub out and high pass for the main outputs? The high pass for the mains is must have to properly integrate the subwoofer in my opinion.

 

[troythector]

So for my NAS server I use TrueNAS Scale and have my media folder shared via SMB. For my audio player I use a Raspberry Pi 3B+ flashed with Volumio Audio Player in which I am able to add network drives via NFS or SMB. Volumio will then index your local music library from the attached network share and play your music via multiple output sources (i.e. HDMI or Raspberry DAC via HAT module).

USB support could handle external hard drives and flash drives for faster access to your local music library.

A change to my original suggestion, I did some research and found WiiM products have support Logitech Media Server (LMS), particularly the Pro and Pro Plus models, through the use of Squeezelite. If Fosi Audio could implement Squeezelite into the S3 Streamer, then this will be easier and provide a better use experience.

I have LyrionMusicServer (previously Logitech Media Server) as a docker on my UNRAID server and much prefer this option as I can use the "Music and Artist Information" plugin which gives additional information for my music collection: biographies, album reviews, credits, related artists etc. The information presented by this plugin are sourced from Wikipedia, Last.fm, Discogs and MusicBrainz and is very detailed.

I decided against using Volumio due to all the good features being hidden behind a paywall :-(