The Fosi Audio S3 Lite Hi-Fi Network Music Streamer & Digital Transport brings high-resolution wireless music streaming to your existing DAC with dual-band Wi-Fi 6, Bluetooth 5.3, Apple AirPlay 2, Google Cast, Spotify Connect, TIDAL Connect, and Qobuz Connect. Featuring USB-A, optical, and coaxial digital outputs, the S3 Lite supports PCM audio up to 32-bit/768kHz over Ethernet while providing flexible connections to compatible external DACs and Hi-Fi systems. With multi-room streaming, a 10-band equalizer, Fosi Audio App control, an included Bluetooth remote, and a dedicated 12V trigger output, the S3 Lite offers a compact and convenient solution for modern digital music playback.
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Fosi Audio S3 Lite Hi-Fi Network Music Streamer & Digital Transport

Bring modern wireless music streaming to your existing Hi-Fi system with the Fosi Audio S3 Lite Hi-Fi Network Music Streamer & Digital Transport. Designed for listeners who already own a quality digital-to-analog converter, the S3 Lite delivers high-resolution digital audio through USB, optical, and coaxial outputs without adding another DAC to the signal chain. Featuring dual-band Wi-Fi 6, Bluetooth 5.3, Apple AirPlay 2, Google Cast, Spotify Connect, TIDAL Connect, and Qobuz Connect, this compact streamer makes it easy to access your favorite music services and personal libraries. With support for PCM audio up to 32-bit/768kHz through a compatible USB DAC over a wired Ethernet connection, the S3 Lite brings advanced network playback to traditional and modern stereo systems alike.

At the heart of the S3 Lite is an Amlogic A113X streaming processor designed to manage network audio playback and deliver digital signals directly to an external DAC. Unlike conventional music streamers with integrated analog conversion, the S3 Lite is a dedicated digital transport, allowing your existing DAC to handle the conversion process. Its USB-A digital audio output supports PCM resolutions up to 32-bit/384kHz over Wi-Fi and 32-bit/768kHz over Ethernet, while its optical and coaxial digital outputs support PCM up to 24-bit/192kHz. Fosi Audio specifies digital-output THD+N as low as 0.000003%, reflecting its focus on clean digital signal transmission for high-fidelity listening.

Designed to fit naturally into today's connected audio systems, the Fosi Audio S3 Lite supports dual-band 2.4GHz and 5GHz Wi-Fi 6 networking and a dedicated 10/100Mbps Ethernet connection. Stream music directly from compatible applications using Spotify Connect, TIDAL Connect, and Qobuz Connect, or use Apple AirPlay 2 and Google Cast to send audio from compatible smartphones, tablets, and computers. DLNA support provides access to compatible music stored on network-attached storage devices and media servers. For convenient everyday listening, Bluetooth 5.3 with SBC and AAC codec support also allows direct wireless playback from compatible devices without requiring a network streaming app.

Multi-room audio support makes the S3 Lite especially useful for listeners who want music throughout their home. With Apple AirPlay 2 and Google Cast, compatible speakers and streaming devices can be grouped for synchronized playback across multiple rooms. Add an S3 Lite or compatible S3 streamer to different audio systems to expand your listening experience while continuing to use your preferred DACs and amplifiers. The Fosi Audio App, available for compatible iOS and Android devices, simplifies initial network configuration, streaming management, and sound customization. A built-in 10-band equalizer provides adjustable frequency controls, allowing you to fine-tune the digital audio signal for your speakers, listening space, or personal preferences.

Connectivity is straightforward and flexible. The S3 Lite features three digital audio outputs: USB-A, optical TOSLINK, and coaxial S/PDIF. Connect the streamer to an external DAC, such as the Fosi Audio ZD3, or another compatible component with a digital audio input. The dedicated 12V trigger output allows the S3 Lite to synchronize power operation with compatible DACs and amplifiers, making it easier to turn an entire listening system on and off together. A front-panel output selector provides convenient switching between USB and S/PDIF output modes, while the included Bluetooth remote offers wireless control over playback and system functions from distances exceeding 15 meters under suitable conditions.

The S3 Lite's minimalist design makes it an excellent addition to both desktop audio systems and traditional Hi-Fi racks. Its compact 5.79-inch-wide chassis features a clean matte-black finish, front-panel status indicators, and straightforward power and pairing controls. With no internal DAC, headphone amplifier, or analog output stage, the S3 Lite focuses on delivering digital music to the components you already own. Whether you're upgrading a traditional stereo system, building a modern streaming setup around a dedicated DAC, or expanding music playback throughout your home, the Fosi Audio S3 Lite delivers versatile connectivity, high-resolution digital audio, and convenient control in one compact component.

Specifications

• Brand: Fosi Audio
• Model: S3 Lite
• Product Type: Network music streamer and digital audio transport
• Audio Channels: 2-channel stereo digital audio
• Digital Transport Design: Dedicated digital audio output without an internal DAC
• Streaming Processor: Amlogic A113X
• Built-In DAC: No; requires an external DAC or component with a compatible digital input
• Network Connectivity: Dual-band Wi-Fi 6 and wired Ethernet
• Wi-Fi Standards: IEEE 802.11 a/b/g/n/ac/ax
• Wi-Fi Frequencies: 2.4GHz and 5GHz
• Ethernet Connection: 1 × RJ45 LAN input
• Ethernet Speed: 10/100Mbps
• Bluetooth Version: Bluetooth 5.3
• Bluetooth Profiles: A2DP, AVRCP, and BTLE
• Bluetooth Audio Codecs: SBC and AAC
• Apple AirPlay: AirPlay 2
• Google Cast: Supported
• Spotify Connect: Supported
• TIDAL Connect: Supported
• Qobuz Connect: Supported
• DLNA: Supported
• Roon: Manufacturer advertises Roon Ready support; completed certification for the S3 Lite has not been independently confirmed
• Multi-Room Audio: Supported through compatible AirPlay 2 and Google Cast configurations
• Network Music Library Playback: Compatible DLNA servers and network music libraries
• Streaming Audio Input Methods: Wi-Fi, Ethernet, and Bluetooth
• Maximum Network PCM Resolution: Up to 32-bit/768kHz
• Maximum USB Output Resolution over Wi-Fi: PCM 32-bit/384kHz
• Maximum USB Output Resolution over Ethernet: PCM 32-bit/768kHz
• Maximum Optical Output Resolution: PCM 24-bit/192kHz
• Maximum Coaxial Output Resolution: PCM 24-bit/192kHz
• Bluetooth Audio Resolution: PCM up to 24-bit/48kHz
• AirPlay 2 Audio Resolution: PCM up to 16-bit/48kHz
• Digital Output THD+N: As low as 0.000003%, manufacturer specification
• Total Digital Audio Output Types: 3
• USB Digital Audio Output: 1 × USB-A
• Optical Digital Audio Output: 1 × TOSLINK
• Coaxial Digital Audio Output: 1 × coaxial S/PDIF
• USB Function: Digital audio output to a compatible external USB DAC
• USB Audio Input: No
• Digital Output Selection: Selectable USB or S/PDIF output mode
• External DAC Compatibility: Compatible USB, optical, or coaxial digital audio inputs
• 12V Trigger Output: 1 × 3.5mm connection
• 12V Trigger Input: No
• 12V Trigger Function: Synchronized power control for compatible downstream DACs and amplifiers
• Sound Customization: Integrated 10-band equalizer
• EQ Control: Adjustable through the Fosi Audio App
• Control App: Fosi Audio App
• App Compatibility: iPhone, iPad, and compatible Android phones and tablets
• Desktop App: No dedicated Windows, macOS, or Linux app
• App Functions: Network setup, streaming management, playback settings, and EQ customization
• Remote Control: Included Bluetooth remote
• Remote Operating Range: Greater than 15 meters under suitable conditions
• Remote Functions: Power, playback, and audio source control
• Front-Panel Controls: Power/input switch and Bluetooth pairing/output selection button
• Input Selection: Network or Bluetooth
• Output Selection: USB or S/PDIF
• Bluetooth Pairing Reset: Supported through front-panel controls
• Factory Reset: Supported through front-panel controls
• Front-Panel Indicators: Network, Bluetooth, and output/status LEDs
• Network Indicator: Displays Wi-Fi/Ethernet connection status
• Bluetooth Indicator: Displays pairing and connection status
• Output Status Indicator: Displays selected USB or S/PDIF output mode
• Firmware Updates: Network-based OTA updates
• Power Requirement: DC 12V/1.5A
• Included Power Supply: External DC adapter
• Chassis Width: 147mm (5.79 inches)
• Chassis Finish: Matte black
• Built-In Speaker Amplification: No
• Speaker Binding Posts: No
• Stereo Speaker Pairs Powered Directly: 0
• Headphone Output: No
• Analog RCA Outputs: No
• Balanced XLR Outputs: No
• Analog Audio Inputs: No
• HDMI Inputs: 0
• HDMI Outputs: 0
• HDMI ARC/eARC: No
• Powered Subwoofer Output: No
• Dedicated Display Screen: No
• Manufacturer Warranty: 24-month limited warranty
• Included Accessories: Fosi Audio S3 Lite Streamer, DC power adapter, optical cable, Bluetooth remote control, and user manual

What It's Great At

• Adding Modern Streaming to an Existing DAC: USB-A, optical, and coaxial digital outputs allow the S3 Lite to deliver network music directly to your preferred external DAC without adding an unnecessary internal conversion stage.
• High-Resolution Digital Music Playback: Support for PCM audio up to 32-bit/768kHz through USB over a wired Ethernet connection provides flexible high-resolution playback for compatible DACs and music sources.
• Comprehensive Wireless Streaming Support: Wi-Fi 6, Bluetooth 5.3, Apple AirPlay 2, Google Cast, Spotify Connect, TIDAL Connect, Qobuz Connect, and DLNA provide extensive options for accessing digital music.
• Flexible Multi-Room Listening: Apple AirPlay 2 and Google Cast support synchronized audio playback across compatible devices and rooms, bringing your music to multiple listening spaces.
• Customizable App-Based Sound: The Fosi Audio App provides network setup, playback management, and a 10-band EQ for adjusting frequency response to suit your system and listening preferences.
• Convenient Hi-Fi System Integration: A dedicated 12V trigger output, Bluetooth remote, compact matte-black chassis, and straightforward digital connectivity make the S3 Lite an ideal companion for compatible DACs and stereo amplifiers.

FAQ Section

Q: What is the Fosi Audio S3 Lite used for? A: The Fosi Audio S3 Lite is a dedicated network music streamer and digital audio transport designed to bring modern streaming capabilities to an existing Hi-Fi system. It receives music through Wi-Fi, Ethernet, or Bluetooth and sends digital audio to an external DAC through USB-A, optical, or coaxial outputs. Unlike the full Fosi Audio S3, the S3 Lite does not include a built-in DAC or analog outputs.

Q: What music streaming services does the Fosi Audio S3 Lite support? A: The S3 Lite supports Spotify Connect, TIDAL Connect, Qobuz Connect, Apple AirPlay 2, Google Cast, and DLNA. These technologies provide access to compatible streaming apps and network music libraries. Roon Ready is also advertised by the manufacturer, although native certification for the S3 Lite has not been independently confirmed.

Q: Does the Fosi Audio S3 Lite support Apple AirPlay and Bluetooth? A: Yes. The S3 Lite supports Apple AirPlay 2 for streaming music from compatible Apple devices over a network. It also includes Bluetooth 5.3 with SBC and AAC codec support for convenient wireless audio playback from compatible smartphones, tablets, and computers.

Q: Does the Fosi Audio S3 Lite have a built-in DAC? A: No. The S3 Lite is a pure digital transport and does not contain an internal digital-to-analog converter. It requires a compatible external DAC or audio component with a USB, optical, or coaxial digital input to convert the music signal for analog playback. It does not have RCA, XLR, or headphone outputs.

Q: What digital audio outputs does the Fosi Audio S3 Lite have? A: The S3 Lite includes three digital audio outputs: one USB-A, one optical TOSLINK, and one coaxial S/PDIF. The USB connection is an audio output for an external DAC rather than a USB audio input. USB and S/PDIF output modes can be selected using the front-panel controls, with the supported resolution depending on the output and network connection.

Q: What is the maximum audio resolution supported by the Fosi Audio S3 Lite? A: Through its USB digital output, the S3 Lite supports PCM audio up to 32-bit/384kHz over Wi-Fi and 32-bit/768kHz over a wired Ethernet connection. Its optical and coaxial outputs support PCM up to 24-bit/192kHz. Playback resolution also depends on the music source, streaming protocol, connected DAC, and network configuration.

Q: Can I control the Fosi Audio S3 Lite with an app? A: Yes. The Fosi Audio App is available for compatible iOS and Android devices and provides initial network setup, streaming management, and sound customization through a 10-band equalizer. The S3 Lite also includes a Bluetooth remote that allows convenient control from distances exceeding 15 meters under suitable conditions. There is no dedicated Windows, macOS, or Linux companion app.

Q: Does the Fosi Audio S3 Lite have a 12V trigger? A: Yes. The S3 Lite includes one 12V trigger output through a 3.5mm connection. This allows it to synchronize power operation with compatible downstream DACs or amplifiers, helping simplify a multi-component Hi-Fi system. The trigger connection is used for power control and does not carry audio or provide an additional audio output.