Both are Cambridge Audio, from different ranges - so the house sound is shared and the differences are mostly in scale, engineering and price.
| Area | Better | Why |
|---|
| Bass | A | Cambridge Audio MSX20 digs deeper - 120Hz against 150Hz. |
| Amplifier needs | A | Cambridge Audio MSX20 is more sensitive (88dB vs 86dB), so it goes louder on the same amplifier. |
| Size | depends | Cambridge Audio MSX10 is easier to place; Cambridge Audio MSX20 is bigger, which usually goes with fuller bass. Your room decides. |
A Cambridge Audio MSX20 B Cambridge Audio MSX10
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 MSX20 has the edge on paper, though the margin is not large. The rows marked "depends" may matter more to you than the score does. If a subwoofer is in your plans, the bass gap largely stops mattering - you would be crossing over above 150Hz anyway, so judge these on the other rows instead. In a large or open-plan room, Cambridge Audio MSX20 has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, Cambridge Audio MSX10 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.