These are not the same size of amplifier: Marantz MODEL M1 has roughly 2.2x the power of Marantz PM6007. That is about 3.5dB, 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 | A | Marantz MODEL M1 has more power - 100W against 45W into 8 ohms. That is about 3.5dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Room size | depends | We rate Marantz MODEL M1 the better fit for a mid-size room, a large room and a very large room, and Marantz PM6007 for desk or near-field listening and 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 modestly (125W and 60W). |
| Built-in DAC | evenly matched | Both have a DAC on board with much the same capability. |
| Streaming | A | Only Marantz MODEL M1 has AirPlay 2, Roon and HEOS. |
| Analogue inputs | B | Marantz PM6007 takes more analogue sources - 4 against 3. |
| Phono stage | depends | Marantz PM6007 has a built-in phono stage (MM) and Marantz MODEL M1 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. |
| Amplifier class | depends | Marantz MODEL M1 is Class D and Marantz PM6007 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 | Marantz MODEL M1 takes up about 69% less shelf area (552cm² against 1764cm²), and it is 146mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | B | Marantz PM6007 costs less - $899 against $1,000 at list. |
| Watts per dollar | A | Marantz MODEL M1 is the cheaper watt - about $10 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 MODEL M1 B Marantz PM6007
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: Marantz MODEL M1 measures better, Marantz PM6007 costs about 10% less. With most speakers in most rooms that gap is smaller in practice than it looks here. 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 - Marantz MODEL M1 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 45 watts is already more than most people ever use, and the extra 55 watts would be headroom you pay for and never hear - we rate Marantz MODEL M1 poorly for near-field use for exactly that reason. If you play records, Marantz PM6007 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.