One is a streaming all-in-one and the other is an amplifier. Judge them on how many boxes you want and what you already own, not on the spec sheet alone.
| Area | Better | Why |
|---|
| Power | B | Marantz Model 30 has more power - 100W against 60W into 8 ohms. That is about 2.2dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Room size | depends | We rate Marantz PM7000N the better fit for desk or near-field listening and a small room, and Marantz Model 30 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 | Marantz Model 30 holds up better into a 4-ohm load: its output nearly doubles to 200W, where the other increases modestly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | A | Marantz PM7000N is the quieter design on paper - 115dB against 88dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | A | Marantz PM7000N has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Streaming | A | Only Marantz PM7000N has AirPlay 2, Roon and HEOS. |
| Analogue inputs | B | Marantz Model 30 takes more analogue sources - 6 against 3. |
| Room to grow | evenly matched | The same expansion options on both. |
| Amplifier class | depends | Marantz PM7000N is Class A/B and Marantz Model 30 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 | Marantz PM7000N takes up about 17% less shelf area (1684cm² against 2033cm²), and it is 78mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | Marantz PM7000N costs less - $1,299 against $2,999 at list. |
| Watts per dollar | A | Marantz PM7000N is the cheaper watt - about $22 per watt against $30. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Marantz PM7000N B Marantz Model 30
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?
Marantz PM7000N 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 - Marantz Model 30 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 - Marantz Model 30 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 60 watts is already more than most people ever use, and the extra 40 watts would be headroom you pay for and never hear - we rate Marantz Model 30 poorly for near-field use for exactly that reason.
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.