Bring your entire digital music collection together with uncompromised Hi-Fi performance.

The Fosi Audio S3 is a versatile all-in-one digital front end designed for modern Hi-Fi systems. Combining a high-resolution network streamer, premium DAC and fully balanced preamplifier in a compact chassis, the S3 gives you everything you need to make streaming the heart of your audio system.

With Wi-Fi 6, Bluetooth 5.3, AirPlay 2, Spotify Connect, TIDAL Connect, Google Cast and DLNA, you can access music from virtually any modern source. Add its AKM AK4493SEQ DAC, balanced XLR outputs, HDMI eARC and dedicated subwoofer output, and the S3 becomes much more than a conventional network streamer.

Whether you’re building a dedicated stereo Hi-Fi system, a desktop setup, an active-speaker system or a compact 2.1 home theater, the S3 provides a sophisticated digital hub without taking up valuable space.

One Powerful Digital Hub for Your Hi-Fi System

The S3 combines three essential components in one beautifully compact chassis:

Network Streamer → DAC → Preamplifier

Connect the S3 directly to a power amplifier, integrated amplifier or active speakers and enjoy high-quality digital playback without needing multiple separate components.

Its analog circuitry uses a carefully designed balanced architecture with premium components, including ELNA capacitors and OPA1612 op-amps, while the AK4493SEQ DAC provides high-resolution digital-to-analog conversion with exceptionally low distortion and noise.

With THD+N ≤0.00018%, SNR ≥120dB and SINAD ≥116dB, the S3 is engineered to deliver a clean, detailed and highly transparent signal path.

High-Resolution AKM DAC

At the heart of the S3 is the AKM AK4493SEQ premium DAC.

It supports high-resolution PCM playback and is capable of up to 32-bit/384kHz depending on the playback platform and protocol. The result is a highly capable digital conversion stage designed to preserve the detail, dynamics and tonal character of your music.

Whether you’re listening to lossless streaming services or your own high-resolution music library, the S3 provides a serious DAC stage without requiring a separate component.

Fully Balanced XLR Output

For serious Hi-Fi systems, the S3 offers balanced XLR analog output alongside conventional RCA connectivity.

The balanced architecture is particularly useful when connecting the S3 to balanced power amplifiers, monoblock amplifiers or active speakers. It can provide excellent noise rejection and allows the S3 to integrate naturally into higher-performance balanced audio systems.

The S3’s isolated digital and analog architecture is designed to keep the signal path clean while minimizing unwanted interference.

Wi-Fi 6 & Bluetooth 5.3

Fast, reliable wireless connectivity makes the S3 exceptionally easy to integrate into your home network.

Wi-Fi 6

Dual-band 2.4GHz and 5GHz Wi-Fi provides a fast and stable connection for network streaming.

Bluetooth 5.3

For quick and convenient playback, Bluetooth 5.3 supports SBC and AAC codecs and makes it easy to stream music directly from smartphones, tablets and other Bluetooth devices.

For the highest-quality network playback, however, Wi-Fi streaming provides the S3’s more advanced high-resolution capabilities.

Stream from Your Favorite Services

The S3 works with a wide range of popular streaming platforms and network protocols:

• Spotify Connect
• TIDAL Connect
• Apple AirPlay 2
• Google Cast
• DLNA
• Network/NAS music playback
• Bluetooth 5.3

This gives you the freedom to use the music service and ecosystem you already enjoy instead of being locked into a single platform.

Turn Your NAS into a Hi-Fi Music Library

If you maintain your own collection of FLAC, WAV or other digital music files, the S3 can access compatible music stored on your local network.

Connect your NAS or network music library and use the S3 as a dedicated high-quality digital playback endpoint.

Your music collection becomes available through the same compact device that handles your streaming services.

HDMI eARC for Your TV

The S3 isn’t limited to music.

With HDMI eARC, you can connect your television directly to the S3 and route TV audio through your Hi-Fi system.

This makes the S3 an ideal solution for a living-room system where music and television share the same speakers.

Connect:

TV → HDMI eARC → Fosi Audio S3 → Amplifier → Speakers

No separate AV receiver is required for a simple high-quality stereo setup.

Build a 2.1 Hi-Fi System

A dedicated SUB OUT makes it easy to integrate a powered subwoofer.

The S3 can therefore serve as the central component of a compact 2.1 system:

S3 → Power Amplifier → Main Speakers + Subwoofer

This is particularly useful for bookshelf speakers that benefit from additional low-frequency extension.

Combined with the S3’s digital EQ functionality, you can fine-tune the system to better suit your speakers, room and listening preferences.

Intelligent Control

The S3 can be controlled through the Fosi Audio App, giving you convenient access to playback and system settings from your smartphone.

The included Bluetooth remote provides another simple way to control everyday functions from your listening position.

A 12V trigger output also allows compatible equipment to be synchronized with the S3, making it easier to integrate the streamer into a larger Hi-Fi system.

Compact Design. Serious Capability.

Despite its extensive feature set, the S3 maintains a remarkably compact footprint.

At just 6.81 × 6.81 × 1.85 inches, it can easily fit into a desktop system, bookshelf, media console or dedicated Hi-Fi rack.

Its compact chassis makes it an excellent companion for compact amplifiers and active speakers while still providing the connectivity and performance expected from a full-size digital front end.

Key Features

Premium AKM DAC

AK4493SEQ DAC delivers high-resolution digital-to-analog conversion with exceptionally low noise and distortion.

Balanced Audio Architecture

Fully balanced analog circuitry with XLR output for high-performance Hi-Fi systems.

Wi-Fi 6

Dual-band 2.4GHz/5GHz Wi-Fi provides fast and reliable network streaming.

Bluetooth 5.3

Convenient wireless playback from smartphones, tablets and other compatible devices.

Extensive Streaming Support

Spotify Connect, TIDAL Connect, AirPlay 2, Google Cast and DLNA.

HDMI eARC

Connect your television directly to the S3 and enjoy TV audio through your stereo system.

Dedicated Subwoofer Output

Easily create a powerful and immersive 2.1 system.

Digital EQ

Fine-tune the sound to suit your speakers, room and personal preference.

12V Trigger

Synchronize compatible audio equipment for convenient system control.

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