These are not the same size of amplifier: Emotiva DRA-1 has roughly 2x the power of Denon PMA-900HNE. That is about 3dB, so it is a question of room size and how hard your speakers are to drive, not of one being the better amplifier.
| Area | Better | Why |
|---|
| Power | A | Emotiva DRA-1 has more power - 100W against 50W into 8 ohms. That is about 3dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Room size | depends | We rate Emotiva DRA-1 the better fit for a mid-size room, a large room and a very large room, and Denon PMA-900HNE for desk or near-field listening and a small room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | B | Denon PMA-900HNE holds up better into a 4-ohm load: its output increases strongly to 85W, where the other increases modestly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | A | Emotiva DRA-1 is the quieter design on paper - 115dB against 105dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | Denon PMA-900HNE has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| 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 Emotiva DRA-1 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. |
| Headphones | depends | Only Denon PMA-900HNE has a headphone output. Worth something if you listen late, nothing if you never do. |
| Shelf space | depends | Emotiva DRA-1 takes up about 59% less shelf area (694cm² against 1710cm²), and it is 133mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | Emotiva DRA-1 costs less - $799 against $949 at list. |
| Watts per dollar | A | Emotiva DRA-1 is the cheaper watt - about $8 per watt against $19. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Emotiva DRA-1 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?
Neither runs away with it - they trade advantages. Let the "depends" rows and the speakers you already own settle it. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Denon PMA-900HNE 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 - Emotiva DRA-1 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 50 watts is already more than most people ever use, and the extra 50 watts would be headroom you pay for and never hear - we rate Emotiva DRA-1 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.