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The Fosi Audio S3 is an extremely complete device combining the functions of network 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 supports 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.
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.

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.

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.


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

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.


| 1 | Power on / Source selection |
| 2 | Bluetooth pairing / Output selection |
| 3 | Status indicator |
| 4 | Volume control |
| 5 | XLR output |
| 6 | RCA output |
| 7 | Optical Toslink output |
| 8 | Subwoofer output |
| 9 | RCA input |
| 10 | Optical Toslink input |
| 11 | LAN Ethernet RJ45 port |
| 12 | HDMI eARC port |
| 13 | 12V Trigger out |
| 14 | 12V DC power supply via DC jack |
Technical specifications
| Specifications | |
|---|---|
| Product type | Streamer DAC Preamplifier |
| DAC chip | AK4493SEQ |
| ADC chip | PCM1894 |
| Processor | Amlogic A113X |
| Op-amps | OPA1612 |
| Inputs | 1x RCA input 1x Optical Toslink input 1x HDMI eARC input Bluetooth WiFi 6 1x Ethernet RJ45 port |
| Outputs | 1x RCA output 1x Balanced XLR output 1x Optical Toslink output 1x Subwoofer output |
| Other connectivity | 1x 12V Trigger OUT |
| WiFi | Dual-band Wi-Fi 802.11 a/b/g/n/ac/ax (2.4GHz and 5GHz) Ethernet port 10/100M |
| Supported Bluetooth codecs | SBC, AAC |
| Supported streaming protocols | Google Cast, AirPlay 2, DLNA, Roon compatible, Spotify Connect, Tidal Connect |
| Supported sampling rates | Optical Toslink, HDMI eARC, WiFi : PCM 24bit 192kHz Bluetooth : 24bit 48kHz Google Cast : 24bit 96kHz Airplay 2 : 16bit 48kHz Roon Ready : 32bit 384kHz |
| General | |
|---|---|
| Power supply | 12V DC 2.5A via DC jack |
| Dimensions | 17.3 x 17.3 x 4.7cm |
| Color | Gray |
| Package contents | 1x Fosi Audio S3 1x Optical Toslink cable 1x IR remote control 1x Power adapter |
| Input | RCA |
| Input | Bluetooth |
| Input | HDMI eARC |
| Input | Optical |
| Input | WiFi |
| Output | RCA |
| Output | Subwoofer |
| Output | Optical Toslink |
| Output | XLR |
| DAC / ADC Chip | AK4493SEQ |
| Max sampling rate | 384kHz |
| Color | Gray |
| Class | Class D / T |
| Networking | Yes |
| Remote Control | Yes |
| Streaming services & Network protocols | Spotify Connect |
| Streaming services & Network protocols | Roon / Roon Bridge / Roon Ready |
| Streaming services & Network protocols | UpnP |
| Streaming services & Network protocols | AirPlay |
| Streaming services & Network protocols | Tidal Connect |
| Streaming services & Network protocols | Chromecast |