Siblings in HiFi Rose's RA range, so they share a design and a house sound. It comes down to power, features and price.
| Area | Better | Why |
|---|
| Power | B | HiFi Rose RA180 has more power - 400W against 250W into 8 ohms. That is about 2dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Grip on hard loads | evenly matched | Both behave much the same into 4 ohms - output barely increases (250W and 400W). |
| Noise floor | evenly matched | Much the same signal-to-noise ratio (109dB vs 107dB). |
| Room to grow | B | Only HiFi Rose RA180 offers preamp outputs - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Shelf space | depends | HiFi Rose RA280 takes up about 14% less shelf area (1638cm² against 1909cm²), and it is 63mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | HiFi Rose RA280 costs less - $3,395 against $6,995 at list. |
| Watts per dollar | A | HiFi Rose RA280 is the cheaper watt - about $14 per watt against $17. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A HiFi Rose RA280 B HiFi Rose RA180
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?
HiFi Rose RA180 is ahead, but on only 1 of the measured areas, and it costs about 106% more. That is a lot of money for a narrow margin - HiFi Rose RA280 is the sensible buy unless a specific feature above decides it for you. 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 - HiFi Rose RA180 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 250 watts is already more than most people ever use, and the extra 150 watts would be headroom you pay for and never hear - we rate HiFi Rose RA180 poorly for near-field use for exactly that reason. Think about the whole system: the roughly $3,600 saved by taking the cheaper one would buy better speakers or a subwoofer, which does more for the sound than the difference between two competent amplifiers.
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.