No single best amplifier here. What decides it is what you have to drive, what you need to plug in, and how much of the system you want in one box.
| Area | Better | Why |
|---|
| Power | B | Rega Elex-R has more power - 72W against 50W into 8 ohms. That is about 1.6dB, which is a small step in loudness but real headroom on peaks. |
| Room size | depends | We rate Audiolab 6000A MKII the better fit for desk or near-field listening and a small room, and Rega Elex-R for a mid-size room, a large room and a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Built-in DAC | A | Audiolab 6000A MKII has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Analogue inputs | B | Rega Elex-R takes more analogue sources - 4 against 3. |
| Room to grow | A | Only Audiolab 6000A MKII offers a pre-out/main-in loop - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Price | A | Audiolab 6000A MKII costs less - $1,099 against $1,395 at list. |
A Audiolab 6000A MKII B Rega Elex-R
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. If you already own a DAC or a streamer, the built-in one is money you are paying twice for, and Rega Elex-R becomes the more rational buy.
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.