These are not the same size of amplifier: WiiM Amp has roughly 2.4x the power of Cambridge Audio AXA25. That is about 3.8dB, so it is a question of room size and how hard your speakers are to drive, not of one being the better amplifier.
| Area | Better | Why |
|---|
| Power | A | WiiM Amp has more power - 60W against 25W into 8 ohms. That is about 3.8dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Room size | depends | We rate WiiM Amp the better fit for a very large room, and Cambridge Audio AXA25 for desk or near-field listening. Match the amplifier to the room you actually have, not the one you want. |
| Speaker load rating | A | WiiM Amp is rated down to 4 ohms against 8, so it is the safer partner for a low-impedance speaker. |
| Noise floor | A | WiiM Amp is the quieter design on paper - 98dB against 82dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | A | WiiM Amp has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Streaming | A | Only WiiM Amp has AirPlay 2, Chromecast and Roon. |
| Room to grow | A | Only WiiM Amp offers preamp outputs - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Amplifier class | depends | WiiM Amp is Class D and Cambridge Audio AXA25 is Class A/B. Class D runs cool and draws almost nothing at idle; Class A/B runs warm and is the long-established mainstream choice. Modern examples of both measure well - judge by the rest of the page. |
| Shelf space | depends | WiiM Amp takes up about 71% less shelf area (420cm² against 1462cm²), and it is 120mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | evenly matched | Priced within a few per cent of each other. |
| Watts per dollar | A | WiiM Amp is the cheaper watt - about $5 per watt against $12. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A WiiM Amp B Cambridge Audio AXA25
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both amplifiers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
WiiM Amp has the edge on paper, though not by much. The rows marked "depends" are more likely to decide this than the score is. Start with the room. In a large or open-plan room, or with speakers that are hard to drive - low sensitivity, or an impedance that dips - WiiM Amp has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 25 watts is already more than most people ever use, and the extra 35 watts would be headroom you pay for and never hear. If you already own a DAC or a streamer, the built-in one is money you are paying twice for, and Cambridge Audio AXA25 becomes the more rational buy.
What a spec sheet cannot show: how either sounds with your speakers, how the controls feel day to day, and what the app is like to live with - which is where most all-in-one amplifiers are actually won or lost. Power figures are the manufacturers' own and are not measured to a common standard, so treat small differences as noise. If you can hear both, that will tell you more than any row above.