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 | Denon PMA-900HNE has more power - 50W against 40W into 8 ohms. That is about 1dB, which is a small step in loudness but real headroom on peaks. |
| Room size | depends | We rate ELAC DS-A101-G the better fit for desk or near-field listening, and Denon PMA-900HNE for a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | A | ELAC DS-A101-G holds up better into a 4-ohm load: its output nearly doubles to 80W, where the other increases strongly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | B | Denon PMA-900HNE is the quieter design on paper - 105dB against 101dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | Both decode on board, but only Denon PMA-900HNE handles DSD. |
| Streaming | B | Only Denon PMA-900HNE has AirPlay 2 and HEOS. |
| Analogue inputs | B | Denon PMA-900HNE takes more analogue sources - 3 against 2. |
| Phono stage | depends | Denon PMA-900HNE has a built-in phono stage (MM,MC) and ELAC DS-A101-G 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. |
| Headphones | depends | Only Denon PMA-900HNE has a headphone output. Worth something if you listen late, nothing if you never do. |
| Shelf space | depends | ELAC DS-A101-G takes up about 56% less shelf area (746cm² against 1710cm²), and it is 46mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | ELAC DS-A101-G costs less - $850 against $949 at list. |
A ELAC DS-A101-G B Denon PMA-900HNE
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?
Denon PMA-900HNE leads across most of the measured areas for a fairly modest premium, so it is the easier pick if the budget stretches. ELAC DS-A101-G is the one to take if it does not. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - ELAC DS-A101-G is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating. If you play records, Denon PMA-900HNE 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.