Different price classes - Naim Uniti Star costs roughly 2.3x what Marantz Model 40n does. Expect it to lead on paper; the question is whether you will hear the difference through the speakers you own.
| Area | Better | Why |
|---|
| Power | evenly matched | Effectively the same output - 70W against 70W into 8 ohms is under 1dB, which is not an audible difference in loudness. |
| Built-in DAC | A | Both decode on board. Naim Uniti Star goes higher - 384kHz against 192kHz. Very few recordings exist above 192kHz, so treat this as headroom, not as sound quality. |
| Streaming | evenly matched | Only Naim Uniti Star has Chromecast; only Marantz Model 40n has HEOS. Neither list is longer in a way that matters - check the one service you actually pay for. |
| Analogue inputs | B | Marantz Model 40n takes more analogue sources - 3 against 1. |
| Phono stage | depends | Marantz Model 40n has a built-in phono stage (MM) and Naim Uniti Star 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. |
| Built-in sources | depends | Naim Uniti Star has a CD player built in. That is one less box if you still play discs or listen to radio, and dead weight if you do not. |
| Shelf space | depends | Naim Uniti Star takes up about 35% less shelf area (1371cm² against 2126cm²), and it is 165mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | B | Marantz Model 40n costs less - $2,499 against $5,699 at list. |
| Watts per dollar | B | Marantz Model 40n is the cheaper watt - about $36 per watt against $81. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Naim Uniti Star B Marantz Model 40n
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 Model 40n has the edge on paper, though not by much. The rows marked "depends" are more likely to decide this than the score is. If you play records, Marantz Model 40n saves you buying a phono stage; if you do not, ignore that row entirely. Think about the whole system: the roughly $3,200 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.