These are not the same size of amplifier: Hegel H30A has roughly 14.7x the power of Hegel H150. That is about 11.7dB, 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 | Hegel H30A has more power - 1100W against 75W into 8 ohms. That is about 11.7dB - 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 Hegel H30A the better fit for a large room and a very large room, and Hegel H150 for desk or near-field listening, a small room and a mid-size room. Match the amplifier to the room you actually have, not the one you want. |
| Speaker load rating | A | Hegel H30A is rated down to 1 ohms against 2, so it is the safer partner for a low-impedance speaker. |
| Bass control | B | Hegel H150 has the higher damping factor (2000 vs 500), which usually means a tighter grip on a woofer. Above about 100 the returns flatten out, so read this as a tendency rather than a ranking. |
| Noise floor | evenly matched | Much the same signal-to-noise ratio (100dB vs 100dB). |
| Built-in DAC | B | Hegel H150 has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Analogue inputs | B | Hegel H150 takes more analogue sources - 3 against 2. |
| Phono stage | depends | Hegel H150 has a built-in phono stage (MM) and Hegel H30A 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. |
| Shelf space | depends | Hegel H150 takes up about 39% less shelf area (1505cm² against 2473cm²), and it is 225mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | B | Hegel H150 costs less - $3,600 against $20,000 at list. |
| Watts per dollar | A | Hegel H30A is the cheaper watt - about $18 per watt against $48. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Hegel H30A B Hegel H150
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. 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 - Hegel H30A has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 75 watts is already more than most people ever use, and the extra 1025 watts would be headroom you pay for and never hear - we rate Hegel H30A poorly for near-field use for exactly that reason. If you play records, Hegel H150 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.