No single best amplifier here. What decides it is what you have to drive, what you need to plug in, and how much of the system you want in one box.
| Area | Better | Why |
|---|
| Power | A | Audiolab 9000A has more power - 100W against 80W into 8 ohms. That is about 1dB, which is a small step in loudness but real headroom on peaks. |
| Room size | depends | We rate Audiolab 9000A the better fit for a large room and a very large room, and Roksan Attessa Integrated Amp for a small room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | evenly matched | Both behave much the same into 4 ohms - output increases strongly (160W and 130W). |
| Noise floor | A | Audiolab 9000A is the quieter design on paper - 110dB against 98dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | A | Both decode on board, but only Audiolab 9000A handles DSD and MQA. |
| Analogue inputs | A | Audiolab 9000A takes more analogue sources - 3 against 2. |
| Room to grow | A | Only Audiolab 9000A offers a pre-out/main-in loop - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Shelf space | depends | Audiolab 9000A takes up about 15% less shelf area (1518cm² against 1779cm²), and it is 68mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | B | Roksan Attessa Integrated Amp costs less - $2,099 against $2,999 at list. |
A Audiolab 9000A B Roksan Attessa Integrated Amp
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?
The usual trade-off: Audiolab 9000A measures better, Roksan Attessa Integrated Amp costs about 30% less. With most speakers in most rooms that gap is smaller in practice than it looks here. Think about the whole system: the roughly $900 saved by taking the cheaper one would buy better speakers or a subwoofer, which does more for the sound than the difference between two competent amplifiers.
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.