These are not the same size of amplifier: NAD Masters Series M10 V2 has roughly 3.3x the power of NAD D 3020 V2. That is about 5.2dB, 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 | B | NAD Masters Series M10 V2 has more power - 100W against 30W into 8 ohms. That is about 5.2dB - a different class of amplifier rather than a bigger version of the same one, and far more than most rooms will ever ask for. |
| Room size | depends | We rate NAD D 3020 V2 the better fit for desk or near-field listening and a small room, and NAD Masters Series M10 V2 for a mid-size room, a large room and a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Noise floor | A | NAD D 3020 V2 is the quieter design on paper - 98dB against 90dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | Both decode on board. NAD Masters Series M10 V2 goes higher - 192kHz against 96kHz. Very few recordings exist above 192kHz, so treat this as headroom, not as sound quality. |
| Streaming | B | Only NAD Masters Series M10 V2 has AirPlay 2, Roon and BluOS. |
| Analogue inputs | B | NAD Masters Series M10 V2 takes more analogue sources - 2 against 1. |
| Phono stage | depends | NAD D 3020 V2 has a built-in phono stage (MM) and NAD Masters Series M10 V2 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 NAD Masters Series M10 V2 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 | evenly matched | The same expansion options on both. |
| Headphones | depends | Only NAD D 3020 V2 has a headphone output. Worth something if you listen late, nothing if you never do. |
| Shelf space | depends | NAD D 3020 V2 takes up about 76% less shelf area (146cm² against 606cm²), and it is 30mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | NAD D 3020 V2 costs less - $499 against $2,999 at list. |
| Watts per dollar | A | NAD D 3020 V2 is the cheaper watt - about $17 per watt against $30. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A NAD D 3020 V2 B NAD Masters Series M10 V2
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?
The usual trade-off: NAD Masters Series M10 V2 measures better, NAD D 3020 V2 costs about 83% less. With most speakers in most rooms that gap is smaller in practice than it looks here. 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 - NAD Masters Series M10 V2 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 30 watts is already more than most people ever use, and the extra 70 watts would be headroom you pay for and never hear - we rate NAD Masters Series M10 V2 poorly for near-field use for exactly that reason. If you play records, NAD D 3020 V2 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.