Multiple Options for Enjoying Music

Capable of up to PCM 32bit/768kHz lossless audio, it delivers wired-grade sound quality with the convenience of wireless control.

Note: Roon Ready certification is in progress and not yet supported. You can still use Roon via AirPlay 2 or Google Cast.

Product details

Description

All in One HiFi Streamer: The S3 combines digital transport, DAC & preamp in one chassis. The flagship AK4493SEQ DAC supports PCM up to 32bit/384kHz with THD+ N ≤0.00018% and SNR ≥120dB—delivering reference-grade sound for serious home audio systems

WiFi 6 & Bluetooth 5.3: Dual-band (2.4/5GHz) Wi-Fi and Bluetooth ensure wider coverage and faster wireless connections. Supports AirPlay 2, Spotify Connect, TIDAL Connect, Google Cast, and DLNA. Stream music from NAS or online services with ease

Balanced Circuit with Premium Components: Isolated analog/digital architecture, Japan ELNA capacitors, ultra-low-noise LDO power supply. Dual op-amp differential amplification with XLR balanced outputs, engineered for greater separation and a wider soundstage

Intelligent Control & Home Theater Ready: Easy setup with the Fosi Audio App to control playback and fine-tune the sound via EQ. With HDMI eARC and a dedicated SUB OUT, you can connect to your TV and active subwoofer to build an immersive 2.1 home theater

Reliable Streaming Amplifier with Smart Protection: 12V trigger sync, overcurrent/overvoltage safeguards, bottom heat dissipation. Compact 6.81" design—integrated amp companion with audiophile performance

Specifications

Chipset
Amlogic A113X + AKM 4493SEQ + OPA1612

Network
802.11 a/b/g/n/ac/ax dual-band Wi-Fi (2.4 GHz and 5 GHz) 10/100M Ethernet port

Bluetooth
Bluetooth 5.3, A2DP, AVRCP, BTLE; supports SBC and AAC codecs

Remote Control
Bluetooth connectivity with a range of over 15 meters

Power
DC 12V 1.5A

Input Sampling Rate
OPT: PCM 24bit / 192kHz
BT: PCM 24bit / 48kHz
Google Cast: PCM 24bit / 96kHz
Airplay 2: PCM 16bit / 48kHz
HDMI: PCM 24bit / 192kHz
Roon Ready: PCM 32bit / 384kHz
Wi-Fi: PCM 32bit / 384kHz
LAN:PCM 32bit / 768kHz


Streaming Protocols
Google Cast, AirPlay 2, DLNA, Roon Ready, Spotify Connect, Tidal Connect, Qobuz Connect


APP
Fosi Audio APP Download on Google Play and the App Store

Dimensions
17.3 × 17.3 × 4.7 cm (6.81 × 6.81 × 1.85 in)

What‘s in the box?
  • Fosi Audio S3
  • Bluetooth Remote Control
  • Quick Guide
  • DC Power Adapter
  • Optical Cable

FAQs

Please read our FAQs page to find out more.

Fosi Audio App Upgrade Plan

April 2026
Add Qobuz Connect
10-Band EQ
Chinese & Japanese Language Support

May 2026
All-New Interaction Design: streamlined menus and a redesigned bottom navigation for a more intuitive, fluid experience
Customizable Home Screen: tailor the interface to your preferences
Streamlined Features: refined and consolidated functions for greater efficiency
Enhanced Visual Design: refreshed UI with improved balance, clarity, and overall comfort

Note: This roadmap applies globally. Please refer to official announcements for release timing.

What versions of AirPlay does the S3 support?

The S3 supports AirPlay 1 and 2.

What devices does the Fosi Audio App support, and where can I download it?

The Fosi Audio App is only available for iPhone/iPad and Android phones or tablets. You can search for "Fosi Audio" on the App Store or Google Play to download and install it.

The Fosi Audio App includes some feature options such as mute control and clock settings, but they don't work on the S3. What's the reason?

Some feature options in the App are reserved for future versions and are temporarily unavailable. The software is currently being continuously optimized, and we will gradually complete and unlock these features in future updates.

Does the S3 support Roon streaming playback?

Roon Ready certification is currently in progress and is not yet supported. Other functions work normally, and you can connect to Roon via AirPlay 2 or Google Cast.

Can I connect a turntable directly to the S3 streamer?

No, turntables without a built-in phono preamp must be connected to an external phono preamp first before connecting to the S3 streamer.

How to download S3 firmware?

1. Enter the URL: https://support.fosiaudio.com/products/s3/

2. Click on "Manuals & Downloads", and then click on "Firmware"

3. Select the latest firmware version and click to automatically start the download

4. After the download is complete, unzip the file, and you will see two folders: "Global" and "China". You only need to keep the folder corresponding to the region you need

How to update firmware via computer?

1. Open the Fosi Audio app, click on "My Device", and record the IP address of the current device (the string of numbers below the device name)

2. Turn on your computer (please ensure that the computer and the current device are connected to the same network), open your browser, enter this IP address in the web address bar, and add /settings.fcgi (as shown below)

3. Press "Enter" to enter the device's debugging interface and locate the "File" column in "Firmware Update"

4. Click "Select File" to open the file that was just unzipped, and select the folder for the corresponding region

5. Select the "image.XXX.swu" file, and then confirm. Finally, wait for the device upgrade to complete

What is the maximum PCM sampling rate supported by the Fosi Audio S3?

The S3 is equipped with the AK4493SEQ DAC chip, which natively supports PCM decoding up to 32‑bit / 768 kHz, delivering outstanding resolution. However, due to wireless bandwidth limitations, streaming over Wi‑Fi (2.4GHz/5GHz) is capped at 384 kHz to ensure stable, buffer‑free playback. To experience the full 768 kHz high‑resolution audio, we recommend connecting the S3 to your router via the LAN (Ethernet) port, which provides ample bandwidth for stable support of up to 768 kHz. For other input methods (such as HDMI eARC, optical, coaxial, USB, etc.), the actual sampling rate depends on the output capability of the source device; the DAC will support the highest rate permitted by the corresponding input standard.

  • 5 stars: 41 (79%)
  • 4 stars: 11 (21%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
M
Michael B
A very competant streamer

I feel like the streamer market is pretty saturated right now, but I can't say I'm mad about my purchase of the S3.

I paired it up with the ZA3 via XLR cables. After powering it on, walking through the connection set-up, I was ready to go in less than five minutes.

I was able to stream via Tidal Connect with no issues. It found the S3 on my network easily, and it just worked. I feel like that was my overall experience of the S3. Nothing ever didn't work. The most complicated thing was that I didn't read the instructions about linking the bluetooth remove, and that was my fault.

The app is pretty no-frills, but if you go on their forums, they have a roadmap of updates that are coming, and you can submit your own requests.

F
Frank D.
Great bang for the buck, keep the updates coming!

I bought this to update the inputs of my classic Sansui G6000 receiver. I��m going from a 7.1 a/v receiver to a 2.1 channel set up. Wow! The new school AKM DAC coupled with my old school A/B class receiver sounds amazing! Detailed and full, warmth with punch. I can retain my sub and just connect my tv with the eARC HDMI connection and my digital sources remain in the same. Easy switching through the tv for gaming, Apple TV and movies. Once the streaming services that I use, Pandora and Amazon Music come on line, I��ll give this 6 stars. Streaming through AirPlay is not great if you walk out the room with your phone�� the connection becomes unstable quickly. Other than that, this punches above its weight. Can��t wait for the next update!

S
Samir Izzatov
Super quality

I really liked the streamer. I had a Wiim Mini, and the sound quality is much better. The only things missing are room correction and, preferably, USB. I'm really looking forward to a well-designed, user-friendly new firmware.

P
Peter S.
Great, simple hub for any multimedia Hi-Fi system

It became my core multimedia / HiFi system. It is conveniently connects to my TV via HDMI ARC, turns on automatically, the volume can be adjusted with the remote also, and it switches off with it also. Besides that, I can turn it on anytime with Tidal, automatically switches the input without the need of a remote. Besides that, it sounds great!

J
Jay
Love it so far

The new Nine Inch Noize album is sadly not on vinyl, so I bought this device literally just to play it on my fancy speakers. It works great. I've seen some criticism online about the app not being amazing, which is valid, but it easily connected (I'm using Spotify), and that's really all I need.

IMPORTANT NOTE: Like many new products, there was a firmware update when I set it up. Pretty normal, but for some reason it took ~45 minutes to download and almost 3 hours to install, which was not at all what I was expecting (most firmware updates I've done on other devices are pretty quick). I was worried that something went wrong and the device got ruined, but I decided to be patient, and it finally completed, and the device works fine. Just a heads up so others don't freak out like I did.

F
Fred R
Fosi quality and great customer service!

After purchasing the S3 + ZA3 bundle I could not be happier with the quality of equipment and such an easy setup to match my speakers. After unpacking I realised I was missing a speaker cable and with a quick response from Fosi customer service via email, they posted the additional cable which arrived promptly! I could not fault this. Well done Fosi for looking after customers that matter to you��Oh and big thanks to Sherry! ????

V
Vincent J.
Super Streamer

ch habe den Fosi Audio S3 als moderne Streaming-Br��cke f��r mein Setup aus Audionet MAP 1 und AMP 3 gekauft. Da ich die hochwertigen Wandler des MAP 1 nutzen wollte, habe ich den S3 per Toslink verbunden und das Ergebnis ist fantastisch. Der Sound bleibt extrem klar und dynamisch, genau so, wie ich es von meiner Kette gewohnt bin.
Besonders beeindruckt hat mich die Unkompliziertheit: W?hrend Hi-Res-Streaming (z. B. Apple Music) fr��her ��ber USB oft m��hsam war, klappt es hier jetzt in Sekunden. Der S3 ist zwar winzig, bietet aber eine saubere Performance ohne Kompromisse. Auch die eigenen Wandler des S3 klingen f��r diese Preisklasse ��berraschend detailliert in den H?hen und im Bass. Eine perfekte L?sung, um hochwertige Klassiker fit f��r das digitale Zeitalter zu machen!

G
Guillermo
Rough start, but has promise��.

Well, I jumped on early and got this streamer directly from Fosi. This was my first jump into HiFi and I went all in on Fosi with speakers, sub, amps and the. Also this S3 Streamer as I saw it as the best and cheapest way to get started.

Op��n getting the streamer I was very disappointed that Tidal connect did not work out of the box :( this was such a bad first experience with the brand, so I contacted support and got that started to try and see if they could help.

We did go back and forth for a few days, and I was really just about to return everything I got ($1,500+ in total), but they kept responding and trying to help, at the end they told me and update to the tidal app would come and that it would fix this.

Funny thing is that everything else works great, Bluetooth, Spotify connect, Apple play and google cast. It was just Tidal that was not working.

Well��. A few days later, Tidal updated the app and sure enough, things started to work. Fosi did apologize, even though I do think it was more a Tidal issue than a Fosi, but what do I know.

Regardless, they kept communicating and I��m now a customer for life. It��s funny but it��s when things go wrong that you see what a company is really like.

The streamer works great and I��m happy, and they have also promised to add more feature and make it better, and this will make this purchase worth even more.

S
Stretoo
Un excellent streamer mais avec une marge de progression.

Le Fosi Audio S3 est une r��ussite sur le plan du rendu sonore grace �� une technologie de qualit�� bien maitris��e. L��int��gration initiale au r��seau Wi-Fi est ais��e, la fonction Bluetooth est efficace, �� noter qu��elle doit ��tre activ��e lors de cette proc��dure pour un smartphone sous Android (ceci n��est pas mentionn�� au point 1 de la proc��dure du guide d'installation rapide actuel). La partie logicielle n��est pas encore �� maturit��, Fosi Audio confirme que certaines fonctions essentielles sont encore en d��veloppement, elles seront int��gr��es dans les prochaines semaines. L��ensemble est perfectible principalement en ce qui concerne la gestion des entr��es/sorties qui n'est pas tr��s intuitive autant sur le streamer que sur la t��l��commande. Les 4 indicateurs lumineux sur le boitier sont peu lisibles en plein jour si on n'est pas dans l'axe du boitier et qu'on s'��loigne un peu de lui (en utilisation de salon par exemple). Ils m��riteraient d'��tre plus lumineux et plus gros ou, encore mieux, que le boitier dispose d'un ��cran attractif. Quant �� l��application �� t��l��charger elle est fonctionnelle pour les ��l��ments basiques mais elle est cependant d��une apparence peu r��jouissante et toujours en phase d'am��lioration.
La partie DAC int��gr��e est superbe, on peut donc ais��ment utiliser le S3 comme pr��ampli sans y adjoindre un DAC externe, cela sans sacrifier la qualit�� du rendu sonore. A mentionner: les deux sorties XLR mais pas de sortie coaxiale (seulement optique). L��entr��e RCA est bienvenue pour y brancher un ��l��ment analogique.
En conclusion : le S3 est un excellent streamer au rapport qualit�� prix convaincant. Il restitue un tr��s beau son mais n��cessite encore quelques am��liorations logicielles et fonctionnelles pour arriver �� maturit��. Je souhaite vraiment une ergonomie plus efficace et une esth��tique plus aboutie �� l��avenir afin de hisser le S3 au-dessus de la comp��tition.

N
Nathanial Torp

I am happy with it from the first touch and hearing waiting though to listen with the set of 2 v3 mono

N
Norris Abernathy

It's better than I expected. The sound quality is also okay... It connects well from the perspective of using a Turkish plug. The US plug is better than the EU plug when connecting an adapter.

B
Billy Breitenberg

Please provide a Korean manual. There are many music enthusiasts in Korea as well. Please use Korean electrical codes as well. I really like the way FOSI is progressing.

J
John Fredriksson

Noticeable better sound than my DIY bluetooth reciever.
But the power cable was a bit short for my place.

J
JOSÉ LUIS CAMPOS FREITAS

Produto muito bom para o preço. gostei muito e recomendo!
APP simples e intuitiva
Saídas Balanceadas fazem a diferença no resultado do som

A
Athanasios Vasileiou

I bought it more as a dac to connect my active speakers with xlr. The sound is warm and detailed with beautiful bass. The build quality is very good and quite elegant. I expect more updates and improvements to the app in the future

S
Sunil Sharma
Compact and hard hitting performance

The S3 is quite the surprise. It outclasses the WiiM Pro Plus or WiiM Ultra. But things jump up to a noticable degree with I swapped out the stock switching power supply with a Linear Power Supply, and even further capacitor filter bank. We are talking inexpensive but good products $100cad each to keep it in value proposition territory. Very impressive sound connected to a pair of Genelec G3 monitors. Hats off to the Fosi Team. I won't say giant killer because it's a misleading vague expression. But clearly this is a great inexpensive product. Buy it!

S
Saul de Nova Ledesma
Excelent streamer.

Is my first streamer and I'm very please with its performance v��a Tidal Connect and HDMI Arc conectivity. I just receive its last update of your app and is getting better and better. Please keep up surprise all of us.

O
On yee Cheng
Suggestion about the apps

I use a samsung tab as a remote, but the fosi app only hv vertical view, hope next version will have a horizontal view.
I use s3 as a preamp, so I think the volume in app better have number show the status eg. 1-100 or show in db.
Thanks for your help!

M
Michele

Spedizione veloce. Streamer molto veloce anche da nas, semplice nel setting, funziona tutto da app proprietaria, ascolto come da aspettative caldo, rilassante (vs wiim ultra) con 2 fosi audio za3 in mono. App proprietaria (vs wiim) veloce ma ancora spoglia e cruda (infatti uso dsfile di synology). Unico neo: non esistono filtri crossover per guidare il subwoofer (come fa wiim) ma ha solo un equalizzatore semplicissimo. Se avessesse un app completa avrei dato 5 stelle.

W
William Meeker

Good sounding box, connects quickly and easily. Awesome connectivity on back.

D
Dave R.
Fosi Audio S3, Great!

I��d been looking for an entry level streamer and decided to go for the new S3 since I had a great experience with the little Fosi BT 20A. So far, it��s been great. Sound quality is fantastic and the form factor is good. The app needs work, but is functional for getting the job done.

C
Craig Fearey
Pleasantly surprised

The Fosi Audio S3 has exceeded my expectations. Setup was simple, streaming has been reliable, and the sound is clean, detailed, and enjoyable. Paired with my ZA3, it's an incredible value and an easy recommendation.