These are not the same size of amplifier: Cambridge Audio MXW70 has roughly 2.3x the power of Schiit Aegir 2F. That is about 3.7dB, so it is a question of room size and how hard your speakers are to drive, not of one being the better amplifier.
| Area | Better | Why |
|---|
| Power | B | Cambridge Audio MXW70 has more power - 70W against 30W into 8 ohms. That is about 3.7dB, 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 increases strongly (50W and 125W). |
| Analogue inputs | evenly matched | The same number of line-level inputs (2). |
| Room to grow | evenly matched | The same expansion options on both. |
| Amplifier class | depends | Schiit Aegir 2F is Class A and Cambridge Audio MXW70 is Class D. Class A runs hot and is inefficient by design, in exchange for the simplest signal path; Class D runs cool and draws almost nothing at idle. Modern examples of both measure well - judge by the rest of the page. |
| Price | B | Cambridge Audio MXW70 costs less - $599 against $949 at list. |
| Watts per dollar | B | Cambridge Audio MXW70 is the cheaper watt - about $9 per watt against $32. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Schiit Aegir 2F B Cambridge Audio MXW70
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?
Cambridge Audio MXW70 is the easier recommendation: it leads on most of the measured areas and costs less. Take Schiit Aegir 2F if one of the "depends" rows above describes your system. 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 - Cambridge Audio MXW70 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 30 watts is already more than most people ever use, and the extra 40 watts would be headroom you pay for and never hear. Think about the whole system: the roughly $350 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.