These are not the same size of amplifier: Rotel A11 Tribute has roughly 2x the power of Arcam Solo Uno. That is about 3dB, 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 | B | Rotel A11 Tribute has more power - 50W against 25W into 8 ohms. That is about 3dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Room size | depends | We rate Arcam Solo Uno the better fit for desk or near-field listening, and Rotel A11 Tribute for a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Noise floor | A | Arcam Solo Uno is the quieter design on paper - 117dB against 100dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | A | Arcam Solo Uno has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Streaming | A | Only Arcam Solo Uno has AirPlay 2, Chromecast and Roon. |
| Analogue inputs | B | Rotel A11 Tribute takes more analogue sources - 4 against 1. |
| Phono stage | depends | Rotel A11 Tribute has a built-in phono stage (MM) and Arcam Solo Uno does not. Decisive if you own a turntable, completely irrelevant if you do not - and an outboard phono stage is easy to add later either way. |
| Room to grow | evenly matched | The same expansion options on both. |
| Headphones | depends | Only Rotel A11 Tribute has a headphone output. Worth something if you listen late, nothing if you never do. |
| Amplifier class | depends | Arcam Solo Uno is Class D and Rotel A11 Tribute 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 | Arcam Solo Uno takes up about 79% less shelf area (348cm² against 1629cm²), and it is 132mm 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 | B | Rotel A11 Tribute is the cheaper watt - about $16 per watt against $31. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Arcam Solo Uno B Rotel A11 Tribute
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?
Neither runs away with it - they trade advantages. Let the "depends" rows and the speakers you already own settle it. 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 - Rotel A11 Tribute 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 25 watts would be headroom you pay for and never hear. If you play records, Rotel A11 Tribute saves you buying a phono stage; if you do not, ignore that row entirely.
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.