Different price classes - Marantz Model 40n costs roughly 2.6x what Bluesound POWERNODE 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 - 80W against 70W into 8 ohms is under 1dB, which is not an audible difference in loudness. |
| Noise floor | B | Marantz Model 40n is the quieter design on paper - 106dB against 100dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | A | Both decode on board. Bluesound POWERNODE goes higher - 384kHz against 192kHz. Very few recordings exist above 192kHz, so treat this as headroom, not as sound quality. |
| Streaming | evenly matched | Only Bluesound POWERNODE has BluOS; 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 2. |
| Phono stage | depends | Marantz Model 40n has a built-in phono stage (MM) and Bluesound POWERNODE 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 | Bluesound POWERNODE is Class D and Marantz Model 40n 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 | Bluesound POWERNODE takes up about 80% less shelf area (420cm² against 2126cm²), and it is 291mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | Bluesound POWERNODE costs less - $949 against $2,499 at list. |
| Watts per dollar | A | Bluesound POWERNODE is the cheaper watt - about $12 per watt against $36. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Bluesound POWERNODE 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?
Neither runs away with it - they trade advantages. Let the "depends" rows and the speakers you already own settle it. 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 $1,550 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.