Fosi Audio S3 balanced HiFi network streamer, DAC and preamp front panel with orange volume knob, 120dB SNR and 0.00018% THD+N
Fosi Audio S3 rear panel inputs and outputs — balanced XLR output, RCA in and out, optical in and out, subwoofer out, HDMI eARC, LAN and 12V trigger
Fosi Audio S3 streaming support showing TIDAL Connect, Spotify Connect, Google Cast, Apple AirPlay, Roon Ready and UPnP logos
Fosi Audio S3 with Wi-Fi 6 and Bluetooth 5.3 logos and a phone showing the Fosi control app for stable wireless hi-fi streaming
Fosi Audio S3 controlled from the app on iPad, iPhone and Android showing now-playing and a 5-band equalizer over dual-band Wi-Fi
Fosi Audio S3 flagship chipset close-up showing AKM AK4493SEQ DAC, Amlogic A113X, PCM1804 ADC and Texas Instruments OPA1612 op-amps
Fosi Audio S3 what is in the box — the streamer unit (173x173x47mm, 870g), DC power adapter, optical cable, Bluetooth remote control and quick start guide
Fosi Audio S3 balanced HiFi network streamer, DAC and preamp front panel with orange volume knob, 120dB SNR and 0.00018% THD+N
Fosi Audio S3 rear panel inputs and outputs — balanced XLR output, RCA in and out, optical in and out, subwoofer out, HDMI eARC, LAN and 12V trigger
Fosi Audio S3 streaming support showing TIDAL Connect, Spotify Connect, Google Cast, Apple AirPlay, Roon Ready and UPnP logos
Fosi Audio S3 with Wi-Fi 6 and Bluetooth 5.3 logos and a phone showing the Fosi control app for stable wireless hi-fi streaming
Fosi Audio S3 controlled from the app on iPad, iPhone and Android showing now-playing and a 5-band equalizer over dual-band Wi-Fi
Fosi Audio S3 flagship chipset close-up showing AKM AK4493SEQ DAC, Amlogic A113X, PCM1804 ADC and Texas Instruments OPA1612 op-amps
Fosi Audio S3 what is in the box — the streamer unit (173x173x47mm, 870g), DC power adapter, optical cable, Bluetooth remote control and quick start guide

Fosi Audio S3 HiFi Streamer, DAC and Preamp — AK4493SEQ, WiFi 6, Roon Ready, AirPlay 2

Fosi Audio S3 — full HiFi streamer + DAC + preamp in one compact chassis. Premium AKM AK4493SEQ Velvet Sound DAC (used in units 3-4× the price), Roon Ready native endpoint, AirPlay 2 for Apple ecosystems, Bluetooth 5.0 with LDAC codec for hi-res wireless, plus WiFi 6 for stable congested-network streaming. Balanced XLR + RCA preamp outputs feed any power amp — perfect matched source for AIYIMA A20 MONO or any balanced integrated. Digital inputs: USB (PCM up to 384 kHz / DSD256 native), optical, coaxial S/PDIF; analog RCA line-in accepts turntable phono pre-amps. TIDAL Connect + Spotify Connect + DLNA + web UI + Fosi app for full source flexibility. Under $300 collapses a $500 streamer + $250 DAC + $200 preamp rack into one desktop-footprint box. Direct from Fosi with our promo code, or Amazon US Prime — both buttons below.

Audiophile community verdict: See ASR forum streamer / DAC discussions

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Video Review

Fosi Audio S3 — HiFi streamer, DAC and preamp all-in-one with AK4493SEQ, WiFi 6, Roon and AirPlay 2

The Fosi S3 is a full desktop streaming source in a single compact box. A high-end AK4493SEQ Velvet Sound DAC chip (the same family Denafrips and iFi use in more expensive units), balanced and single-ended preamp outputs to feed a power amp, WiFi 6 for wired-quality streaming, native Roon Ready certification, AirPlay 2 for Apple ecosystems, and Bluetooth 5.0 with LDAC. Under $300 this replaces a $500 streamer + $250 DAC + $200 preamp stack.

Why buy the S3

  • AK4493SEQ Velvet Sound DAC — premium AKM chip family; delta-sigma with notably smooth top-end. Ships in units 3-4× the price.
  • Roon Ready native — shows up as endpoint in Roon out of the box; no bridging via a separate Roon Bridge device needed.
  • AirPlay 2 + Bluetooth 5.0 + LDAC — iOS, Android, and macOS all stream natively. No app-lock-in.
  • WiFi 6 for streaming stability — fewer dropouts than WiFi 5 gear in congested networks, especially for hi-res streams.
  • Balanced XLR + RCA preamp outputs — feeds any power amp cleanly; balanced runs long cable distances without hum pickup.

Who it’s for

Anyone building a modern digital hi-fi rig who wants the streamer/DAC/preamp complexity collapsed into one box. Perfect front-end for a pair of AIYIMA A20 MONO or any balanced power amp. Also a Roon user’s dream endpoint at this price — no separate Roon Bridge needed.

Who should skip it

Skip the S3 if you don’t need streaming and just want a pure DAC — the AIYIMA D20 or a standalone DAC will be cheaper. Also skip if you want an integrated amp with speaker outputs built in; S3 is a preamp, not a power amp — you need a separate amplifier for passive speakers.

Common questions

Does it work fully headless (no phone / app required)? Physical volume knob and input selector on the front; basic operation without an app. But full config (WiFi setup, Roon, AirPlay 2) uses the Fosi app or a web interface.

Does the AK4493SEQ actually sound different than an ESS Sabre chip? To resolving ears yes — AKM Velvet Sound is generally smoother in the top octave; ESS is more precise / etched. Personal preference. Most people prefer AKM on long sessions.

Can I use S3 with a phono pre-amp? Yes — one line-in RCA input accepts phono pre-amp output.

Where to buy

Fosi direct with our promo code is typically the cheapest US-shipped path. Amazon US carries it too with Prime returns. Both buttons below.

SKU: fosi-audio-s3 Category: Brand:

Editorial synthesis of ~30 publicly-available Amazon owner reviews for the Fosi Audio S3 (US + UK + AU + IT + ES + MX + PL + NL) as of 2026-08. We aggregate consistent themes so you can see what verified purchasers actually say after living with this streamer/DAC/preamp — not scraped quotes.

What owners consistently praise

  • AKM AK4493SEQ DAC delivers a "musical, natural" sound signature — the single most-repeated theme. Owners who have compared to ESS Sabre-based units (WiiM Ultra, Cambridge, various DACs) consistently describe the AKM as warmer, smoother, more organic and less analytical — with a fuller midrange and more relaxed listening fatigue over long sessions. Vocals, acoustic instruments, and piano gain lifelike body.
  • XLR balanced outputs are the killer feature — multiple owners explicitly recommend using XLR over RCA for the best sonic result. Wider soundstage, quieter background, better channel separation. Even if your amp lacks balanced input, cheap XLR-to-RCA adapters are common. Pairs perfectly with Fosi ZA3 and Fosi V3 monoblocks in a matched ecosystem.
  • HDMI eARC is a rare and game-changing feature at this price point — TV audio routing through a high-quality DAC is practically unheard of under $500 elsewhere. Multiple owners note the eARC can even drive the volume of higher-end external DACs via optical passthrough (e.g., Gustard R26). Perfect for a 2-channel + TV living room setup.
  • Extensive streaming protocol support — AirPlay 2, Spotify Connect, TIDAL Connect, Qobuz Connect (via firmware update), Google Cast, Bluetooth 5.3, DLNA, NAS playback. Owners with mixed-device households (iPhone + Android + Mac + TV) consistently praise the "just works" nature.
  • Wi-Fi 6 dual-band connectivity is rock-solid — multiple owners specifically call this out as more stable than WiiM Ultra (which needed re-pairing every few days for some). One owner noted the S3 works reliably at greater distance from the router than the WiiM.
  • 12V trigger output for auto-amplifier power on/off — a hidden gem for family/gift setups. Turns on the power amp automatically when audio starts, off when it stops. Owners gifting systems to family members repeatedly cite this as making the setup truly "no-thinking-required."
  • Ecosystem completeness — Fosi owners with multiple pieces (V3 monos, ZA3, BT20A Pro, V1b, TB10D) universally describe the S3 as "the missing piece" that ties their existing Fosi rig into a modern streaming front end. Matching orange knob styling reinforces the visual cohesion.
  • Compact, well-built compact chassis — solid metal construction, understated design, reasonable footprint for a full streamer/DAC/preamp combo.
  • Included remote with intuitive layout — clearly-defined pairing and mute buttons, well positioned. Batteries not included (2× AAA needed).

Common use cases owners mention

  • Modern 2-channel HiFi front-end — most common. Replaces older CD players / basic Bluetooth receivers with a full-featured streaming + DAC + preamp in one box. Feeds Fosi V3 monos, ZA3, Cambridge power amps, Mark Levinson, Purifi builds, custom DIY amps.
  • TV + music hybrid living room system — HDMI eARC + AirPlay 2 combo lets one system handle both TV audio and music streaming with equally high quality. Gifted setups to family/non-audiophiles work "hassle-free."
  • Powered speaker upgrade — bookshelf owners with active speakers (Kali IN-5, various KEF/Q Acoustic) use the S3 to elevate above simple Bluetooth streaming with lossless quality.
  • Bringing legacy amps into streaming era — analog-focused audiophiles pair the S3 with vintage 70s/80s pre+power amps to inject Hi-Res Bluetooth + streaming without disrupting the analog signal path.
  • Multi-room via AirPlay 2 / Chromecast — synchronized music across multiple S3 units in different rooms.
  • Business / small venue background music — replaces staff-phone Bluetooth streaming with a stable dedicated device.

Common critical notes from long-term owners

  • App is functional but "basic" — nearly every review flags this. Setup and daily control work, but the app trails WiiM, Naim, Kef, or Cambridge in polish. 5-band EQ works but limited compared to full parametric. Fosi is actively updating firmware and adding features — some functions visible in the app (mute icon, clock) are reserved for future updates.
  • No display screen — 4 status LEDs on the front instead of a proper display. You cannot see track info, sample rate, or connection type at a glance. Owners suggest a future revision add even a small screen.
  • No headphone jack / no 3.5mm output / no USB-C audio input — cannot be used as a desktop DAC/amp for headphones directly, cannot receive audio from a laptop over USB. Multiple owners flag this as the biggest missed feature — Fosi could have added USB-C PD for both power and PC audio.
  • Roon compatibility not at launch — Roon fans need to wait for future firmware. Not a dealbreaker for most, but worth knowing if you're a Roon subscriber.
  • Larger physical footprint than the photos suggest — reviewers coming from ultra-small preamps note the S3 is notably bigger than expected. Measure your shelf before ordering.
  • Remote requires 2× AAA batteries, NOT included — nearly every owner mentions this. Fosi should include alkaline batteries at this price point.
  • Occasional HDMI eARC "stuck pause" state — one detailed owner noted a rare condition where pausing via remote on HDMI eARC caused a lockup requiring power cycle. Firmware update appears to have resolved it — always update on unboxing.
  • Signature orange volume knob = love or hate — Fosi's iconic orange rotary dial is either "loved as brand identity" or "clashes with a minimalist rack." No way to change color.
  • Requires quality amp + speakers to hear the DAC potential — the AKM DAC will not rescue a mid-tier amp / speaker chain. Pair with meaningful gear (Fosi ZA3+, V3 monos, Cambridge, Buchardt, KEF, etc.) to hear the difference over a basic Bluetooth receiver.

Best amp pairings from real owner reports

  • Fosi Audio ZA3 — matched-brand XLR balanced signal path, the natural default match.
  • Fosi V3 monoblocks — dual-mono balanced connection over XLR, owners report "beyond expectation" pairing.
  • 3e Audio A7 TPA3255 — XLR-in TPA3255 with Enhanced PFFB, measurement-first pick.
  • Cambridge 851n / Mark Levinson no5302 (owners report S3 competes at moderate volumes)
  • Yaqin MC13S tube integrated amp — for "3D soundstage" enthusiasts
  • Sony TA-A1ES / vintage 70s-80s Class-AB integrated (analog synergy)

Best speaker pairings from real owner reports

  • Martin Logan Impression 11a (high-end pairing)
  • Q Acoustic 5020, KEF LSX, Kali IN-5 monitors
  • Magnepan LRS+ (planar magnetic)
  • Klipsch RP-600M II — horn-loaded high-sensitivity bookshelves
  • HiVi-Swans D3.1 MKII — low-sensitivity bookshelves that benefit from S3's clean output

Recommended setup workflow (from top owner reviews)

  1. Unbox, update firmware immediately via Fosi Control app (fixes early bugs incl. HDMI eARC lockup, Qobuz Connect setup)
  2. Set output to XLR (not the default RCA)
  3. Use LAN cable if possible for stability; Wi-Fi 6 is fine as fallback
  4. Pair with dedicated streaming service (Qobuz + Tidal for Hi-Res)
  5. Dial in 5-band EQ for your room acoustics (small adjustments only)
  6. Add a 12V trigger cable to your power amp for hands-off auto-on/off
  7. Buy 2× AAA batteries for the remote before you need them

Overall verdict from owner community: the Fosi Audio S3 is a "punches-well-above-its-price" streamer/DAC/preamp that delivers meaningful sonic quality via its AKM AK4493SEQ chip and balanced XLR architecture, while packing genuine flagship-tier connectivity (HDMI eARC, Wi-Fi 6, AirPlay 2, Qobuz/Tidal/Spotify Connect, 12V trigger). Owners comparing to WiiM Ultra, Cambridge 851n, and even Mark Levinson at moderate listening levels consistently keep the S3 in their systems. Skip only if you specifically need Roon at launch, a display screen, a headphone output, or USB-C PC audio input — those are the four legitimate gaps. For a modern streamlined 2-channel or 2.1 living room setup, this is one of the safest recommendations under $300 in 2026. Perfect natural pairing with the Fosi ZA3 or Fosi V3 monoblocks for a matched-brand rig, or with 3e Audio A7 for TPA3255 measurement-first Class-D.

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Specification

BrandFosi Audio
ModelS3
TypeHiFi Streamer + DAC + Preamp
Dac ChipAKM AK4493SEQ Velvet Sound
Streaming ServicesRoon Ready, AirPlay 2, TIDAL Connect, Spotify Connect, DLNA
WirelessWiFi 6 (802.11ax), Bluetooth 5.0 with LDAC
InputsUSB (up to PCM 32-bit / 384 kHz, DSD256), Optical, Coaxial, RCA, Bluetooth, WiFi
OutputsBalanced XLR pre-out, RCA pre-out, 6.35 mm headphone
Usb DecodingPCM up to 32-bit / 384 kHz, DSD256 native
App ControliOS, Android, web UI
DimensionsApprox. 7.9 × 5.9 × 2.0 in (200 × 150 × 50 mm)
CertificationsCE, FCC, RoHS
Warranty18 months manufacturer
In The BoxS3 unit, power adapter, WiFi antenna, user manual, warranty card

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