A valve amplifier against a solid-state one. They are not really rivals: they differ in character, in what they will drive and in what owning them involves, so start there rather than with the watts.
| Area | Better | Why |
|---|
| Power | B | Rotel Diamond RA-6000 has more power - 235W against 40W into 8 ohms. That is about 7.7dB - 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 PrimaLuna EVO 100 Integrated the better fit for desk or near-field listening, a small room and a mid-size room, and Rotel Diamond RA-6000 for a large room and a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Noise floor | B | Rotel Diamond RA-6000 is the quieter design on paper - 103dB against 90dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | Rotel Diamond RA-6000 has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Analogue inputs | A | PrimaLuna EVO 100 Integrated takes more analogue sources - 5 against 4. |
| Phono stage | depends | Rotel Diamond RA-6000 has a built-in phono stage (MM) and PrimaLuna EVO 100 Integrated 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. |
| Amplifier type | depends | PrimaLuna EVO 100 Integrated is Tube and Rotel Diamond RA-6000 is Solid State. Valve designs are usually warmer and softer at the limits and need their tubes replaced eventually; solid state is the lower-maintenance choice. This is a taste and ownership decision, not a quality one. |
| Shelf space | depends | PrimaLuna EVO 100 Integrated takes up about 43% less shelf area (1128cm² against 1979cm²), and it is 52mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | PrimaLuna EVO 100 Integrated costs less - $3,295 against $4,499 at list. |
| Watts per dollar | B | Rotel Diamond RA-6000 is the cheaper watt - about $19 per watt against $82. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A PrimaLuna EVO 100 Integrated B Rotel Diamond RA-6000
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: Rotel Diamond RA-6000 measures better, PrimaLuna EVO 100 Integrated costs about 27% 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 - Rotel Diamond RA-6000 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 40 watts is already more than most people ever use, and the extra 195 watts would be headroom you pay for and never hear - we rate Rotel Diamond RA-6000 poorly for near-field use for exactly that reason. If you play records, Rotel Diamond RA-6000 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.