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 | B | Rotel RA-1592 MKII has more power - 200W against 140W into 8 ohms. That is about 1.5dB, which is a small step in loudness but real headroom on peaks. |
| Grip on hard loads | B | Rotel RA-1592 MKII holds up better into a 4-ohm load: its output increases strongly to 350W, where the other increases strongly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | evenly matched | Much the same signal-to-noise ratio (103dB vs 103dB). |
| Built-in DAC | evenly matched | Both have a DAC on board with much the same capability. |
| Streaming | A | Only Rotel RAS-5000 has AirPlay 2 and Chromecast. |
| Analogue inputs | B | Rotel RA-1592 MKII takes more analogue sources - 4 against 1. |
| Phono stage | depends | Rotel RA-1592 MKII has a built-in phono stage (MM) and Rotel RAS-5000 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. |
| Room to grow | evenly matched | The same expansion options on both. |
| Price | A | Rotel RAS-5000 costs less - $2,999 against $3,200 at list. |
| Watts per dollar | B | Rotel RA-1592 MKII is the cheaper watt - about $16 per watt against $21. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Rotel RAS-5000 B Rotel RA-1592 MKII
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?
Rotel RA-1592 MKII leads across most of the measured areas for a fairly modest premium, so it is the easier pick if the budget stretches. Rotel RAS-5000 is the one to take if it does not. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Rotel RA-1592 MKII is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating. If you play records, Rotel RA-1592 MKII 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.