Different kinds of product: one is active with its amplifier built in, the other passive and needs one. Judge them on how you want to own the system, not just the specs.
| Area | Better | Why |
|---|
| Bass | A | Cambridge Audio L R M digs deeper - 40Hz against 50Hz. |
| What you buy | depends | Cambridge Audio L R M is a complete system - just add a source. B&W 707 S2 also needs an amplifier: more money and another box, but you choose it. |
| Connections | depends | Cambridge Audio L R M has Bluetooth, Wi-Fi, streaming, HDMI and phono built in. With B&W 707 S2 that all comes from the amplifier you pair it with. |
| Upgrade path | depends | B&W 707 S2 can be re-amped later and outlive several amplifiers; Cambridge Audio L R M ages as one unit. |
| Size | depends | Cambridge Audio L R M is easier to place; B&W 707 S2 is bigger, which usually goes with fuller bass. Your room decides. |
| Cabinet | depends | Passive Radiator vs Ported. |
| Expandability | depends | Cambridge Audio L R M: a sub output; B&W 707 S2: bi-amping. |
| Price | evenly matched | Much the same money ($1,599 vs $1,599 a pair) - though the passive pair still needs an amplifier. |
A Cambridge Audio L R M B B&W 707 S2
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 speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
Cambridge Audio L R M suits you if you want one box, ready to play, with nothing else to buy. B&W 707 S2 suits you if you already have an amplifier, want to choose the electronics, or expect to upgrade in stages. Neither is the better speaker in the abstract. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 50Hz anyway, so judge these on the other rows instead. In a large or open-plan room, B&W 707 S2 has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, Cambridge Audio L R M is the easier speaker to get right.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.