FiiO S15 Review: Big-Screen Streamer and Desktop DAC

Who Should Buy It

Key Specifications

Overview

The FiiO S15 is a network streamer and desktop DAC built around a flagship AKM chipset, a Snapdragon 660 processor and a 7.84-inch touchscreen. It runs an open Android 12 operating system, which means the major streaming apps install directly on the device rather than being limited to a fixed menu. The listing presents it as a full-width hi-fi source component in black.

At 430mm wide the chassis matches standard hi-fi separates, so it sits naturally on a rack above an integrated amplifier or power amplifier. It has no speaker outputs and is not an amplifier, which is worth stressing because the listing describes it as a streamer and DAC only. It occupies the upper mid-range price tier.

This review works from the published listing, which in this case is unusually detailed on the digital architecture and the input and output panel. Dimensions beyond width, weight, and the full file format list are not stated. We flag those gaps where they affect a buying decision.

Power and Sound Quality

Power output is not applicable, since the S15 drives an amplifier or active speakers rather than passive loudspeakers. Sound quality therefore depends on the conversion stage, the clocking and the analog output design. The listing describes the DAC as the AK4191 and AK4499EX pairing, a two-chip arrangement that separates digital processing from the analog conversion stage.

That fully separated digital and analog architecture is described in the listing as a way to improve signal to noise ratio and reduce noise amplitude, which in plain terms means a quieter background and more audible low level detail. The brand characterizes the resulting sound as balanced in dynamics with a relaxed and natural tonal character. We cannot verify that description, but the design logic is sound.

Clocking receives specific attention. Two ACCUSILICON AS318-B femtosecond oscillators at 45.1584MHz and 49.1520MHz handle the two audio sample rate families, and the listing says each unit is selected before use. Low phase noise clocks reduce jitter in both the internal conversion and the digital outputs, which matters when the S15 feeds an external DAC.

Connectivity and Inputs

The rear panel is the most complete part of the published data. Digital inputs include AES, coaxial, optical and HDMI, with HDMI ARC allowing a television to send its audio back to the S15. Digital outputs include I2S, AES, coaxial, optical and HDMI, so the unit can act as a pure transport into another converter.

Analog output comes in both single ended RCA and balanced XLR form. Balanced XLR output is a notable inclusion at this tier and lets the S15 drive a balanced power amplifier or active monitors over long cable runs with better noise rejection. The listing does not publish output voltage for either connection.

Local playback sources are generous: built-in storage, TF cards, USB drives and external hard drives are all named. Network sources cover NAS and local area network shares through UPnP, SMB and WebDAV, plus cloud servers. The listing does not explicitly state Wi-Fi or Ethernet hardware, though network streaming clearly requires one of them.

Formats, Processing and Room Correction

Streaming protocol support is broad. Roon Ready, AirPlay, DLNA and Bluetooth are confirmed, and because the device runs open Android 12, native apps for services such as Spotify, TIDAL and Qobuz can be installed directly. That approach avoids the compatibility gaps that closed streamer platforms sometimes suffer when a service changes.

Maximum PCM sample rate, DSD support and MQA decoding are not stated in the listing, which is a surprising omission given the detail elsewhere. Room correction is not a function of a source component and nothing of that kind is listed. The custom FiiO OS layered over Android provides the horizontal interface and playback engine.

• Roon Ready certification
• AirPlay and DLNA streaming
• Bluetooth network streaming
• UPnP, SMB and WebDAV network file access
• Open Android 12 for native streaming apps
• Maximum sample rate and DSD support not published

Features, Streaming and Apps

The 7.84-inch display is described as automotive grade, a term that usually indicates a panel specified for wide temperature tolerance and long service life rather than a consumer tablet screen. It presents album art, track information and the app interface at a size that is readable from a listening chair. FiiO OS provides the custom horizontal layout.

Control is available four ways according to the listing: directly on the device through dual knobs and dual virtual buttons, through the touchscreen, through a Bluetooth remote, and through an app on a phone or tablet. That flexibility suits both desk use, where the touchscreen is within reach, and rack use across the room.

Because the system is open Android, the S15 can also install utility apps, file managers and alternative players. That openness is a strength for enthusiasts and a mild complication for anyone who prefers an appliance-like experience. The Snapdragon 660 processor is a mid-tier mobile chip that should keep the interface responsive.

Build, Design and Controls

The chassis width of 430mm is the only published dimension. Height, depth and weight are not stated, so plan rack space from the width alone and confirm the rest before ordering. The finish in this listing is black.

Front panel controls consist of two physical knobs and two on-screen buttons alongside the touchscreen. Two knobs typically split volume and navigation duties, giving tactile control for the most frequent actions. The listing does not describe the knob material or the chassis construction.

The internal layout separates digital and analog sections, and the presence of balanced outputs and AES connections points to a design intended for serious system integration rather than casual desktop listening. Included accessories, including whether the Bluetooth remote ships in the box, are not published in the listing.

Setup and Daily Use

Initial setup resembles setting up an Android tablet: connect to the network, sign into the streaming accounts you use, and install any additional apps. Roon users add the S15 as an endpoint from the Roon core, and AirPlay appears automatically to Apple devices on the same network.

Day to day, the large screen makes browsing a local library or a streaming catalog more pleasant than the small displays on most streamers. HDMI ARC means the S15 can also serve as the audio path for a television, turning a two-channel system into a simple television sound setup without a receiver.

Users who feed an external DAC will appreciate the choice of I2S, AES and coaxial outputs, each with its own strengths depending on the receiving device. Users who rely on the internal DAC can run balanced XLR straight to a power amplifier. The listing does not describe the volume control behavior on the line outputs, so confirm whether fixed and variable modes are offered.

Who Should Buy It

The S15 suits the listener who wants one component to handle streaming, local files, television audio and digital to analog conversion with a large screen and full-width styling. Roon subscribers, NAS owners and anyone with a mixed library of local and streamed music will find the protocol support unusually complete.

It is less suitable for anyone who needs amplification in the same box, or who prefers a closed, simple interface. Buyers who need confirmed maximum sample rates or weight and depth figures should verify those details first, since the listing omits them.

Alternatives Worth Considering

The WiiM Amp is the straightforward alternative for anyone who wants streaming and amplification together in a compact box at a lower cost, though it lacks the large display, the balanced outputs and the AES and I2S connections. For a desktop system with passive speakers it is the more practical choice.

Listeners who want a traditional stereo receiver with streaming might look at the Yamaha R-N303, which again combines amplification with network playback. Neither alternative matches the S15 as a pure source and DAC, so the choice comes down to whether you already own an amplifier worth keeping.

Verdict

The FiiO S15 offers one of the most complete connection panels in its tier, a flagship AKM converter stage, careful clocking and an open Android platform that keeps pace with streaming services. The large display and multiple control options make it practical as well as capable.

The published gaps, chiefly maximum sample rate, weight and depth, are frustrating but not disqualifying. For an upper mid-range source component feeding an existing amplifier, the S15 is a strong contender on paper and earns a high score for connectivity and features.

Strengths and Limitations

Alternatives to Consider

Onkyo Muse Y-40

Living room listeners who want one compact box that streams from every major service, plays records and handles television sound with real power.

Read the Onkyo Muse Y-40 review →

Marantz M1

Buyers who want a compact, HEOS connected streaming amplifier with real power and HDMI eARC television integration, ideally as part of a wider HEOS multi-room setup.

Read the Marantz M1 review →

FiiO R9

Desktop and headphone focused listeners who want a flagship grade DAC, a powerful headphone amplifier, and an HDMI equipped streamer in one unit.

Read the FiiO R9 review →

Questions Buyers Ask