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 | A | HiFi Rose RA280 has more power - 250W against 130W into 8 ohms. That is about 2.8dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Grip on hard loads | B | JBL SA750 75th Anniversary Edition holds up better into a 4-ohm load: its output increases strongly to 200W, where the other barely increases. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | B | JBL SA750 75th Anniversary Edition is the quieter design on paper - 112dB against 109dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | JBL SA750 75th Anniversary Edition has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Streaming | B | Only JBL SA750 75th Anniversary Edition has AirPlay 2 and Roon. |
| Room to grow | B | Only JBL SA750 75th Anniversary Edition offers preamp outputs - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Headphones | depends | Only JBL SA750 75th Anniversary Edition has a headphone output. Worth something if you listen late, nothing if you never do. |
| Amplifier class | depends | HiFi Rose RA280 is Class AD and JBL SA750 75th Anniversary Edition is Class G. Class G/H switches its supply rails to cut the heat a Class A/B design wastes. Modern examples of both measure well - judge by the rest of the page. |
| Price | B | JBL SA750 75th Anniversary Edition costs less - $3,000 against $3,395 at list. |
| Watts per dollar | A | HiFi Rose RA280 is the cheaper watt - about $14 per watt against $23. 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 JBL SA750 75th Anniversary Edition
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?
JBL SA750 75th Anniversary Edition is the easier recommendation: it leads on most of the measured areas and costs less. Take HiFi Rose RA280 if one of the "depends" rows above describes your system. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - JBL SA750 75th Anniversary Edition 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 - HiFi Rose RA280 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 130 watts is already more than most people ever use, and the extra 120 watts would be headroom you pay for and never hear.
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.