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 | B | Audiolab 7000A has more power - 70W against 45W into 8 ohms. That is about 1.9dB, which is a small step in loudness but real headroom on peaks. |
| Room size | depends | We rate Marantz PM6007 the better fit for desk or near-field listening and a small room, and Audiolab 7000A for a mid-size room, a large room and a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | B | Audiolab 7000A holds up better into a 4-ohm load: its output increases strongly to 110W, where the other increases modestly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | B | Audiolab 7000A is the quieter design on paper - 110dB against 102dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | Both decode on board, but only Audiolab 7000A handles DSD and MQA. |
| Analogue inputs | A | Marantz PM6007 takes more analogue sources - 4 against 3. |
| Room to grow | B | Only Audiolab 7000A 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 7000A takes up about 14% less shelf area (1510cm² against 1764cm²), and it is 59mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | Marantz PM6007 costs less - $899 against $999 at list. |
| Watts per dollar | B | Audiolab 7000A is the cheaper watt - about $14 per watt against $20. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Marantz PM6007 B Audiolab 7000A
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?
Audiolab 7000A leads across most of the measured areas for a fairly modest premium, so it is the easier pick if the budget stretches. Marantz PM6007 is the one to take if it does not. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Audiolab 7000A 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.