WiiM Pro

The step up from the Mini — and another device that keeps getting better

Like the rest of the WiiM range, the Pro is reviewed here as a long-term reference rather than a launch-day snapshot, because the interesting story is how it has matured. I bought mine in April 2023, a few months after living with the WiiM Mini, and it has not aged quite as gracefully as that $109 bargain has — WiiM’s own lineup rather got the better of it, first with the better-DAC’d Pro Plus and then with the Ultra, which has better internals again. What has kept the Pro relevant regardless is its lossless optical output and a noticeably more useful set of inputs and outputs than the Mini offers, which is exactly the ground it still holds in my own system.

The Pro is the considered step up from the Mini: a more capable streamer with a sturdier chassis, wired Ethernet, Chromecast, and a cleaner measured output, while keeping the same effortless WiiM app experience.

It sits in the middle of the lineup — above the Mini, below the touchscreen WiiM Ultra — and for a lot of people it is the sweet spot: enough connectivity and performance for a serious system, without the cost of the flagship.

Software and the WiiM App — a story of constant improvement

Like the other WiiM reviews on this site, this one is a long-term usage piece rather than a launch-week snapshot, and the Pro keeps giving me the same pleasant surprise the rest of the range does: features arriving well after purchase that genuinely change how much use you get out of it. As with every WiiM device, the hardware is only half the product — the WiiM Home app and the firmware are the other half, and both have improved continuously since launch. A WiiM Pro bought a couple of years ago does meaningfully more today than it did out of the box, which is exactly why these reviews are framed as living references.

The WiiM app remains one of the most solid and feature-complete control apps in streaming audio — fast, reliable, and stacked with multi-room, a deep set of services, parametric EQ and room correction — and it keeps getting better release after release.

The Pro shared the same trajectory as the Mini and the rest of the range: the 10-band Parametric EQ and per-source EQ arrived through 2023–2024, Room Correction followed in 2024 and grew into full RoomFit by 2025, and — unlike the Mini — the Pro has since been certified Roon Ready, closing the exact gap Amir’s original ASR review flagged on the cheaper sibling. A Pro bought at launch has quietly turned into a Roon endpoint with room correction it never shipped with.

That continual-improvement story is the clearest contrast with a rival like the Fosi Audio S3 — a streamer with genuinely good hardware but software that, for now, is still finding its feet. Side by side, the maturity gap is obvious:

Plenty of companies can build a competent streaming box; WiiM’s software is what keeps the Pro relevant and improving year after year.

What’s in the Box

The Pro arrives with the streamer, a power adapter, an optical cable for high-quality digital connections, and a user manual — everything needed to drop it into a system right away.

Build Quality

The Pro is a clear step up from the Mini in build: a robust, well-finished chassis with a more premium feel and the kind of construction that suggests it is built for constant use.

Internals — the DAC

One point worth noting for the curious: the Pro’s onboard DAC is competent but not a dramatic leap over the Mini’s. The bigger gains here are in connectivity, build and the wired network input rather than raw conversion — and for most users the digital outputs (feeding a separate DAC or active speakers) make that a non-issue.

Features and Connections

This is where the Pro pulls ahead. Alongside Wi-Fi, AirPlay, Bluetooth and the full range of streaming services, it adds wired Ethernet for rock-solid streaming and Chromecast, which opens up seamless casting from a huge range of apps without any extra software. Optical and coaxial digital outputs, line in/out and a sub-friendly setup round out a genuinely flexible I/O set. In the app, multi-room and multi-device control are seamless, and the PEQ and room-correction features apply here just as they do across the range.

Sound Impressions

Analogue — RCA

The analogue output is richer and more dynamic than the Mini’s, with a more expansive soundstage and detailed reproduction.

Digital — Optical / Coaxial

The digital outputs are where the Pro shines — clean, precise and detailed, ideal for feeding a separate DAC or active speakers, and the connection I would build a system around.

Bluetooth

Bluetooth is convenient and stable — not the equal of the wired outputs, but a useful fallback.

Measurements

The Pro has been measured extensively on the bench, and the numbers line up neatly with how I actually use it. Its analogue RCA output is clean and competent rather than class-leading: driving Toslink in to RCA out at maximum volume, it returns around 92 dB SINAD with THD+N in the region of 0.0024%, with a clean 1kHz tone and a low noise floor.

The more telling result is the digital side. Streaming over Roon and out through the optical port, the Pro is a genuinely bit-exact transport: a dithered 24-bit signal comes back with SINAD near 140 dB and effectively no added distortion. That is the whole reason I treat the Pro as a digital source feeding a separate DAC rather than relying on its onboard conversion — the transport is essentially perfect, and the DAC quality then becomes whatever you connect downstream.

Specifications

Rating Explanation

The Pragmatic Rating of 4 reflects a streamer that does almost everything most people need and keeps improving via firmware, with wired Ethernet and Chromecast being the standout additions over the Mini. The Features rating of 5 recognises how complete the I/O and app feature set is at this price. The Price rating of 4 acknowledges it costs meaningfully more than the Mini for gains that are mostly about connectivity and build rather than raw sound, and the Measurements rating reflects a clean but not class-leading output.

Conclusion

The WiiM Pro is the streamer I would point most people to in the range: it adds the wired networking, Chromecast and build quality that turn the Mini’s formula into something you can comfortably anchor a serious system around, while keeping the same excellent, ever-improving WiiM app. As a long-term device it has aged well and gained features along the way — which is exactly what makes the WiiM ecosystem such a pragmatic bet.