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 70W into 8 ohms. That is about 1.5dB, 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 Technics SU-G700M2 Grand Class for a small room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | B | Technics SU-G700M2 Grand Class holds up better into a 4-ohm load: its output nearly doubles to 140W, where the other increases strongly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Built-in DAC | B | Both decode on board. Technics SU-G700M2 Grand Class goes higher - 384kHz against 192kHz. Very few recordings exist above 192kHz, so treat this as headroom, not as sound quality. |
| 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. |
| Amplifier class | depends | Audiolab 9000A is Class A/B and Technics SU-G700M2 Grand Class is Class D. Class A/B runs warm and is the long-established mainstream choice; Class D runs cool and draws almost nothing at idle. Modern examples of both measure well - judge by the rest of the page. |
| Shelf space | depends | Audiolab 9000A takes up about 27% less shelf area (1518cm² against 2069cm²), and it is 138mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | B | Technics SU-G700M2 Grand Class costs less - $2,700 against $2,999 at list. |
| Watts per dollar | A | Audiolab 9000A is the cheaper watt - about $30 per watt against $39. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Audiolab 9000A B Technics SU-G700M2 Grand Class
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, Technics SU-G700M2 Grand Class costs about 10% less. With most speakers in most rooms that gap is smaller in practice than it looks here. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Technics SU-G700M2 Grand Class is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating.
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.