The Best Stereo Amplifiers: 4 Compared (and One to Skip)

RBE top pick

Cambridge Audio Evo 150 SE

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The Evo 150 SE is the most complete one-box hi-fi here, pairing real power and a polished streaming platform with high-end fit and finish. But the WiiM Amp Pro delivers most of the streaming smarts, plus the mic-based room correction the Cambridge lacks, for a tiny fraction of the money. It has no AirPlay and no phono stage, so check those two first.

A modern integrated amplifier is now the whole hi-fi brain in one box: amplification, a digital-to-analog converter, and network streaming for services and phones. We looked at four current, buyable options that span from a giant-killing budget streamer-amp to serious audiophile pieces. Two are easy recommendations, one is a great amp that only makes sense for a specific buyer, and one is popular but hard to justify for anyone building a real stereo.

WiiM

WiiM Amp Pro

Buy it

A compact streaming amp with room correction and HDMI ARC, minus AirPlay and a phono stage, at a fraction of the price of the boxes here.

Best for: Anyone starting or rebuilding a system who wants near-complete features and streaming for the least money.

$ · budget

Why we like it

• Broad streaming support (Google Cast, Spotify, TIDAL and Qobuz Connect, Roon Ready) in a compact aluminum chassis
• Automatic room correction plus 10-band graphic and parametric EQ built into the app
• Loaded with connections for the money: HDMI ARC, optical, line-in, sub out and USB audio out

Know before buying

• Class-D power is modest (60W into 8 ohms), so it can run out of headroom driving big or inefficient floorstanders
• WiiM states it is not an AirPlay receiver, and there is no phono input
• Fit and finish and sound refinement are good-for-the-price, not high-end

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RBE top pick

Cambridge Audio

Cambridge Audio Evo 150 SE

Buy it

The all-in-one to buy if you want real hi-fi power and a polished streaming platform in one elegant box.

Best for: Listeners who want one beautiful box to drive quality speakers and stream everything without compromise.

$$$ · premium

Why we like it

• Serious power and wide dynamics from its Hypex-based amplification, comfortable with demanding speakers
• Mature StreamMagic platform with AirPlay 2, Chromecast and Roon Ready support
• Strong connectivity including balanced XLR input, MM phono stage, HDMI ARC, USB audio, subwoofer out and pre-out

Know before buying

• Costs many times what the WiiM does
• Cambridge's product page lists no EQ, placement settings or microphone-based room correction, which the far cheaper WiiM includes

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Marantz

Marantz Model 40n

It depends

A gorgeous, warm-sounding integrated for people who value the listening over the feature list.

Best for: Buyers who prioritize sound quality, build and a classic look over cutting-edge features or high power.

$$$ · premium

Why we like it

• Class AB amplification with a smooth, musical, refined presentation and excellent build
• Includes a good moving-magnet phono stage and classic tactile controls
• HEOS streaming plus HDMI ARC make it a tidy hub for a TV and turntable setup

Know before buying

• Premium price for relatively modest rated power and a shorter feature list than rivals
• HEOS app and streaming feel dated next to newer platforms, and there is no room correction

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We'd skip it

Sonos

Sonos Amp

Skip it

A capable multiroom brick that makes a poor centerpiece for a real stereo system.

Best for: Existing Sonos households wanting to add passive speakers, not people building a dedicated two-channel system.

$$ · mid-range

Why we like it

• Effortless whole-home multiroom and simple setup within the Sonos ecosystem
• HDMI ARC input makes it easy to power passive speakers from a TV

Know before buying

• Locked to the Sonos app, whose 2024 redesign drew many owner complaints
• Few real hi-fi inputs and a hidden DAC, so it is not built to be the hub of a stereo
• Weak value: a budget streamer-amp offers more flexibility and comparable sound for far less

See our pick instead See it at Amazon anyway Read our detailed assessment ↓

How we judged the field

We do not run our own lab. Instead we synthesize independent testing, professional reviews and aggregated owner reports, then weigh them against what actually matters when an amplifier is also your DAC and streamer. That means looking past the spec sheet: how clean and powerful the amplification really is with normal speakers, how good the built-in converter and inputs are, how mature and reliable the streaming app is, and whether the connectivity (HDMI ARC, phono, subwoofer out, balanced inputs) fits a real system.

We gave particular weight to two things reviewers and owners keep raising. First, app and platform quality - a great-sounding amp is frustrating if its control app is slow or unreliable. Second, honest value: several of these do similar jobs at wildly different prices, so we asked what each one adds over the cheapest capable option.

The WiiM Amp Pro is the value story of the category. In a chassis smaller than a hardback book it packs broad streaming support (Google Cast, Spotify, TIDAL and Qobuz Connect, Roon Ready), an ESS ES9038Q2M DAC, and a genuinely useful set of tuning tools including parametric EQ and automatic room correction. Connectivity is strong for the money, with HDMI ARC, optical, line-in, a subwoofer output and USB audio out. Two gaps matter: WiiM states it cannot act as an AirPlay receiver, and there is no phono input. Reviewers describe the sound as clean, neutral and surprisingly punchy for the price. Its main limit is power: the Class-D amplifier is rated at 60W into 8 ohms, so very large or inefficient speakers can outrun it. For most people building or rebuilding a system, nothing else here is close on value.

If the WiiM is about value, the Evo 150 SE is about doing the whole job with no asterisks. Its Hypex-based amplification delivers real power and wide dynamics, so it stays composed with demanding floorstanders where the budget options strain. The StreamMagic platform is one of the more mature streaming systems, with AirPlay 2, Chromecast and Roon Ready on board, and the connectivity is broad: balanced XLR input, a moving-magnet phono stage, HDMI ARC, USB audio, subwoofer out and pre-out in a genuinely elegant, well-finished box. The catches are the price and, ironically, the lack of the microphone-based room correction the far cheaper WiiM includes. For a buyer who wants one beautiful box to anchor a quality pair of speakers, it is the most complete choice here.

The Model 40n is the enthusiast’s pick, known for a smooth, warm, musical presentation from its Class AB amplification and its lovely build and classic looks. It includes a moving-magnet phono stage, a subwoofer output, tactile controls and HDMI ARC, and HEOS streaming makes it a tidy hub for a TV-and-turntable setup. But you pay a premium for relatively modest rated power and a shorter feature list than rivals, and the HEOS app and streaming experience feel dated next to newer platforms, with no room correction to help in awkward rooms. None of that is a flaw so much as a set of priorities: this is an amplifier you buy for how it sounds and looks, not for what it does on paper. If that is your priority, it delivers; if you want features and flexibility, look elsewhere.

The Sonos Amp is popular and easy to live with, but it makes a poor centerpiece for a real stereo. Its strengths are multiroom convenience and simple setup inside the Sonos ecosystem, plus an HDMI ARC input for powering passive speakers from a TV. As the hub of a two-channel system, though, it falls short: it is locked to the Sonos app, whose 2024 redesign drew many owner complaints, it offers few genuine hi-fi inputs and a DAC you never really interact with, and its value is weak. A budget streamer-amp gives you more inputs, room correction and comparable sound for far less money. Unless you are extending an existing Sonos household with passive speakers, this is the one to pass on.

Cambridge Audio Evo 150 SE vs WiiM Amp Pro: which should you buy?

These are the two we would actually spend money on, and they answer different questions. The WiiM Amp Pro wins on value by a landslide: it streams from almost everything except AirPlay, includes room correction, and costs a small fraction of the Cambridge. For a normal room and efficient speakers, most listeners would struggle to feel short-changed.

The Evo 150 SE justifies its much higher price in two ways. It has the power and dynamic composure to drive bigger, harder-to-drive speakers cleanly, and it delivers a more refined, high-end experience in both sound and build, wrapped in a mature streaming platform with Roon Ready support. The honest rule of thumb: start with the WiiM, and step up to the Evo 150 SE only when your speakers or your ears genuinely ask for more. Buying the Cambridge to drive small bookshelf speakers is spending for headroom you may never use; buying the WiiM to drive large floorstanders may leave you wanting.

What to look for

• Enough clean power for your speakers. Match the amp to your speakers’ sensitivity and size - modest Class-D output suits efficient bookshelves, while big floorstanders want more headroom.
• A streaming platform you trust. The app runs your daily experience; favor mature platforms with AirPlay 2 or Chromecast and a good reliability record.
• The right inputs. Check for HDMI ARC if you will use a TV, a phono stage if you spin vinyl, and a subwoofer output if you may add a sub.
• Room correction or EQ. In real rooms this can matter more than a modest hardware upgrade, and not every amp includes it.
• Value versus the cheapest capable option. Ask what a premium model adds over a budget streamer-amp - sometimes it is real power and refinement, sometimes just a badge.

Our final take

This category has quietly become one of the best-value corners of hi-fi. The WiiM Amp Pro is the one to recommend to almost anyone, delivering broad streaming, room correction and HDMI ARC for pocket money, held back by modest power and the lack of AirPlay and a phono stage. When your speakers or ambitions demand more, the Cambridge Audio Evo 150 SE is the complete one-box answer, with real power and a polished platform in a beautiful chassis. The Marantz Model 40n is a genuinely lovely amplifier for the listener who buys with their ears and eyes rather than a feature checklist. And the Sonos Amp, for all its multiroom convenience, is the one to skip as a stereo centerpiece - a budget streamer-amp does the hi-fi job better for less.

Deciding between the top two? See our head-to-head: Cambridge Audio Evo 150 SE vs WiiM Amp Pro.

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