FOSI AUDIO S3 Network Player DAC Balanced Preamplifier

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The Fosi Audio S3 is an extremely complete device combining the functions of streamer, DAC and balanced preamplifier. Indeed, it relies on high-end components as well as a comprehensive chipset including a Burr-Brown PCM1894 ADC chip, an Amlogic A113X processor, an AK4493SEQ DAC chip and two OPA1612 operational amplifiers for signal preamplification.

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Reference : 21591
New product

279,90 €tax incl.

233,25 € tax excl.
Including 0,05 € for green tax

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Shipping date: 28-04-2026.

Orders placed before 12h (GMT+1) will generally be shipped the same day (working day).

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Facturation France
SAV France

2 Years warranty
 
More info

Fosi Audio S3 Network Player DAC Balanced Preamplifier AK4493SEQ WiFi 6 Bluetooth 5.3 Roon Ready Google Cast Airplay 2 UPnP 32bit 384kHz

Photo of the Fosi Audio S3

The Fosi Audio S3 is an extremely complete device combining the functions of streamer, DAC and balanced preamplifier. Indeed, it relies on high-end components as well as a comprehensive chipset including a Burr-Brown PCM1894 ADC chip, an Amlogic A113X processor, an AK4493SEQ DAC chip and two OPA1612 operational amplifiers for signal preamplification. Packed with technology, the S3 integrates WiFi 6 and Bluetooth 5.3 with support for AAC and SBC codecs, and fsupports numerous streaming protocols: Roon Ready, Google Cast, Airplay 2, Spotify Connect, Tidal Connect and UPnP. In addition, it is capable of converting signals up to PCM 32bit 384kHz, allowing you to enjoy high-resolution audio streams. The Fosi Audio control application available on Google Play and the App Store offers a 5-band equalizer and full control of the device with multiroom streaming capability. In terms of connectivity it is also well equipped: LAN RJ45 port, Toslink input, HDMI ARC input, RCA input, Toslink output, RCA output, balanced XLR output and even an output for an active subwoofer. In short, the S3 will easily integrate into any existing HiFi system and quickly become one of its most essential components.

Fosi Audio S3 : A high-end chipset

As mentioned above, the S3 benefits from a highly performant chipset composed of a Burr-Brown PCM1894 ADC chip, an Amlogic A113X processor, an AK4493SEQ DAC chip and two OPA1612 operational amplifiers. This combination allows it to support sampling rates up to PCM 32bit 384kHz while ensuring high-quality signal processing.

Fosi Audio S3 : a high-end chipset

Fosi Audio S3 : WiFi 6 streamer

First and foremost a streamer, the Fosi Audio S3 offers numerous possibilities thanks to its RJ45 Ethernet LAN port and WiFi 6 functionality. It notably supports various streaming protocols (Roon Ready, Google Cast, Airplay 2, Spotify Connect, Tidal Connect and UPnP), allowing access to a wide range of audio sources.

Fosi Audio S3 : WiFi 6 streamer

Fosi Audio S3 : A balanced circuit

The S3 features an architecture isolating analog and digital processing as well as a differential amplification circuit based on dual OPA1612 op-amps with a balanced XLR output. It is for example recommended to pair it with the ZD3 and/or the ZA3 for a fully balanced system.

Fosi Audio S3 : a balanced circuit
Fosi Audio S3 : Bluetooth 5.3

Fosi Audio S3 : Bluetooth 5.3

As an added convenience, the S3 features Bluetooth functionality with support for AAC and SBC codecs for quick and easy wireless audio reception.

Fosi Audio S3 : 2.1 home cinema

Among the S3 connectivity options, there is notably an HDMI eARC input as well as an output for an active subwoofer, allowing the creation of a 2.1 channel system and easy audio signal retrieval from a television.

Fosi Audio S3 : 2.1 home cinema

Fosi Audio S3 : A dedicated control application

The Fosi Audio control application provides access to a 5-band equalizer as well as a multiroom function if you own multiple S3 units. The equalizer allows you to tailor the sound according to your preferences or the music genre you are listening to.

Fosi Audio S3 : a dedicated control application

Overview of the Fosi Audio S3

Overview of the Fosi Audio S3
1Power on-off / Source selection
2Bluetooth pairing / Output selection
3Status indicator
4Volume control
5Balanced XLR output
6Single-ended RCA output
7Optical Toslink output
8Subwoofer output
9RCA input
10Optical Toslink input
11LAN Ethernet RJ45 port
12HDMI eARC port
1312V trigger output
1412V DC power supply via DC jack

FOSI S3 test by Audio Science Review (Amir)

"I must say, I did not expect Fosi to jump into streaming domain given the heavy software burden that brings with it. They have licensed the core technology which eases entry but also causes delays in bug fixes and feature enhancements. We see some of that effect here but what is there is quite solid. Measured performance is excellent as is support for my favorite, balanced output. Value is quite high given the price point.

I am going to give my recommendation to Fosi S3 streamer."
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Technical specifications

Specifications
Product typeStreamer
DAC
Preamplifier
DAC chipAK4493SEQ
ADC chipPCM1894
ProcessorAmlogic A113X
Op-ampsOPA1612
Inputs1x RCA input
1x Optical Toslink input
1x HDMI eARC input

Bluetooth
WiFi 6
1x Ethernet RJ45 port
Outputs1x Single-ended RCA output
1x Balanced XLR output
1x Optical Toslink output
1x Subwoofer output
Other connectivity1x 12V trigger output
WiFiDual-band Wi-Fi 802.11 a/b/g/n/ac/ax (2.4GHz and 5GHz)
Ethernet port 10/100M
Supported Bluetooth codecsSBC, AAC
Supported streaming protocolsGoogle Cast, AirPlay 2, DLNA, Roon compatible, Spotify Connect, Tidal Connect
Supported sampling ratesOptical Toslink, HDMI eARC, WiFi : PCM 24bit 192kHz
Bluetooth : 24bit 48kHz
Google Cast : 24bit 96kHz
Airplay 2 : 16bit 48kHz
Roon Ready : 32bit 384kHz
General
Power supply12V DC 2.5A via DC jack
Dimensions17.3 x 17.3 x 4.7cm
ColorGray
Package contents1x Fosi Audio S3
1x Optical Toslink cable
1x IR remote control
1x Power adapter
 
Data sheet
InputRCA
InputRJ45
InputHDMI eARC
InputBluetooth
InputWiFi
OutputRCA
OutputSubwoofer
OutputOptical Toslink
OutputXLR
DAC / ADC ChipAK4493SEQ
Max sampling rate384kHz
ColorGray
ClassClass D / T
NetworkingYes
Remote ControlYes
Streaming services & Network protocolsDLNA
Streaming services & Network protocolsSpotify Connect
Streaming services & Network protocolsRoon / Roon Bridge / Roon Ready
Streaming services & Network protocolsUpnP
Streaming services & Network protocolsWeb radios
Streaming services & Network protocolsAirPlay
Streaming services & Network protocolsTidal Connect
Streaming services & Network protocolsChromecast
 
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Average votes
5.0 / 5
1 reviews
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 5/5
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Le mouton à 5 pates :)
A la recherche d'un DAC et d'un préamplificateur, j'avais acquis un ZP3, qui associé à un amplificateur Audiophonics MPA 125, me semblait plutôt convenable, mais je restais sur ma faim concernant l'ergonomie et le rendu semblait manger quelques choses, le ZP3 retourné, je me met en quête d'un produit m'apportant ce qui m'avait manqué : Fosi annonce le S3...
Je le précommande,
Dès la réception ça sonne, mais c'est plutot gras sur le bas médium, curieusement il aura été nécessaire d’atténuer avec l'eq la zone des 250hz, il a pour le moment tourné 8h, depuis j'ai remonté les 250hz de -6db à -4.5db, le medium semble être moins dure que ce qu'il était... à écouter de nouveau ce soir pour confirmer.
Le rendu sonore, est impactant et vif mais sans agressivité !
Niveau détail et spatialisation, c'est excellent ! Je n'espérais pas autant, si l'on ajoute l'ergonomie et la facilité de passage entre les différentes options de connexion par application et protocole airplay... ce produit est la perfection dans sa catégorie de prix et vous permettra d'avoir une chaine hifi simple d'utilisation, compacte et avec un rendu sonore généreux et musicale !

Je ferais un avis plus posé et détaillé notamment concernant l'application, avec plus de recul. Mais pour l'instant à ce prix, il n'y a pour moi pas d'équivalent.
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This review has been posted for FOSI AUDIO S3 Streamer DAC Balanced Preamplifier AK4493SEQ WiFi 6 Bluetooth 5.3 Roon Ready 32bit 384kHz
 
FOSI AUDIO S3 Streamer DAC Balanced Preamplifier AK4493SEQ WiFi 6 Bluetooth 5.3 Roon Ready 32bit 384kHz
The Fosi Audio S3 is an extremely complete device combining the functions of streamer, DAC and balanced preamplifier. Indeed, it relies on high-end...

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