These are not the same size of amplifier: Audiolab 6000A Play 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 | Audiolab 6000A Play 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 Audiolab 6000A Play for a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | A | Arcam Solo Uno holds up better into a 4-ohm load: its output nearly doubles to 50W, where the other increases strongly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | A | Arcam Solo Uno is the quieter design on paper - 117dB against 76dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | A | Both decode on board, but only Arcam Solo Uno handles MQA. |
| Streaming | A | Only Arcam Solo Uno has AirPlay 2, Chromecast and Roon; only Audiolab 6000A Play has DTS Play-Fi. |
| Analogue inputs | B | Audiolab 6000A Play takes more analogue sources - 4 against 1. |
| Phono stage | depends | Audiolab 6000A Play 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 | B | Only Audiolab 6000A Play offers a pre-out/main-in loop - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Headphones | depends | Only Audiolab 6000A Play 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 Audiolab 6000A Play 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 78% less shelf area (348cm² against 1600cm²), and it is 113mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | Arcam Solo Uno costs less - $769 against $1,700 at list. |
A Arcam Solo Uno B Audiolab 6000A Play
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?
Arcam Solo Uno has the edge on paper, though not by much. The rows marked "depends" are more likely to decide this than the score is. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Arcam Solo Uno is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating. 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 - Audiolab 6000A Play 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.
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.