These are not the same size of amplifier: Cambridge Audio Edge A has roughly 4x the power of Pass Labs INT-25. That is about 6dB, 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 Edge A has more power - 100W against 25W into 8 ohms. That is about 6dB - 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 Pass Labs INT-25 the better fit for desk or near-field listening and a small room, and Cambridge Audio Edge A 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 | B | Cambridge Audio Edge A has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Analogue inputs | evenly matched | The same number of line-level inputs (3). |
| Use with a TV | depends | Only Cambridge Audio Edge A has HDMI ARC, so the television can drive it directly and one remote controls the volume. If the system is for music only, this changes nothing. |
| Headphones | depends | Only Cambridge Audio Edge A has a headphone output. Worth something if you listen late, nothing if you never do. |
| Amplifier class | depends | Pass Labs INT-25 is Class A and Cambridge Audio Edge A is Class XA. Class A runs hot and is inefficient by design, in exchange for the simplest signal path. Modern examples of both measure well - judge by the rest of the page. |
| Price | B | Cambridge Audio Edge A costs less - $6,499 against $8,360 at list. |
| Watts per dollar | B | Cambridge Audio Edge A is the cheaper watt - about $65 per watt against $334. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Pass Labs INT-25 B Cambridge Audio Edge A
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 Edge A is the easier recommendation: it leads on most of the measured areas and costs less. Take Pass Labs INT-25 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 Edge A has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 25 watts is already more than most people ever use, and the extra 75 watts would be headroom you pay for and never hear - we rate Cambridge Audio Edge A poorly for near-field use for exactly that reason. If this sits under a television, Cambridge Audio Edge A is the one to buy - HDMI ARC means the TV remote controls the volume and there is no second box in the way.
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.