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 | evenly matched | Effectively the same output - 80W against 80W into 8 ohms is under 1dB, which is not an audible difference in loudness. |
| Noise floor | A | Arcam A15 is the quieter design on paper - 106dB against 100dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | 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 | B | Only Bluesound POWERNODE has AirPlay 2, Roon and BluOS. |
| Analogue inputs | A | Arcam A15 takes more analogue sources - 3 against 2. |
| Phono stage | depends | Arcam A15 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. |
| Use with a TV | depends | Only Bluesound POWERNODE has HDMI eARC, so the television can drive it directly and one remote controls the volume. If the system is for music only, this changes nothing. |
| Room to grow | B | Only Bluesound POWERNODE offers a subwoofer output - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Amplifier class | depends | Arcam A15 is Class A/B and Bluesound POWERNODE 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 | Bluesound POWERNODE takes up about 73% less shelf area (420cm² against 1580cm²), and it is 174mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | B | Bluesound POWERNODE costs less - $949 against $999 at list. |
A Arcam A15 B Bluesound POWERNODE
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?
Bluesound POWERNODE 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, Arcam A15 saves you buying a phono stage; if you do not, ignore that row entirely. If this sits under a television, Bluesound POWERNODE is the one to buy - HDMI ARC means the TV remote controls the volume and there is no second box in the way.
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.